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A common task for many developer and security-centric teams is to provide an identity and access management (IAM) service.  Whether that component only consists of a sign-up form and a login page or a more complex infrastructure, the number one priority is always to provide a seamless functionality for your users.  Failure in implementation can have severe consequences. To reduce your risk and feel confident in your IAM platform, partnering seasoned professionals in the space ensures success.

Companies looking for authentication servers have the option to consider the solutions available in the market or build it themselves.  As each option presents its own set of benefits and drawbacks, teams are often overwhelmed to make the right choice.  In this article, we will cover the key pros and cons of each of the two options that help companies make the right decision for both short-term and long-term benefits.

### Benefits of a Custom-built Platform
1.  Built to your needs: Custom-built IAM platforms can be tailored to your organization's specific requirements.  With a custom solution, you have complete control over the user experience and the technology choices. You can design authentication flows that align with your brand and user journey, creating a seamless experience that doesn't feel disconnected from the rest of your application. This customization extends to crucial workflows like user onboarding, password resets, and permission management—all of which can be optimized for your specific use cases rather than following a generic approach.
2. Enterprise Integrations: Enterprise environments often present complex integration challenges that off-the-shelf IAM solutions struggle to address effectively. A custom-built IAM platform can be architected from the ground up to integrate seamlessly with your existing technology ecosystem, regardless of its complexity or uniqueness.
Legacy systems present a particular advantage for custom solutions. While many modern IAM platforms have limited support for older technologies or protocols, a custom solution can be built to bridge these gaps. Whether you're dealing with mainframe applications, custom LDAP schemas, or proprietary single sign-on systems developed in-house decades ago, a custom solution can be tailored to interface with these systems without compromise.
3. Control Over Data and Infrastructure: A custom-built IAM platform puts you in the driver's seat when it comes to data sovereignty and infrastructure decisions. This complete control means your organization retains ownership of user credentials, access patterns, and authentication logs—data that is often among the most sensitive your company manages.
For organizations in regulated industries such as healthcare, finance, or government, this control can become crucial. Custom solutions allow you to construct specific data residency requirements, ensuring user information never leaves particular geographic boundaries or jurisdictions. You can also implement custom encryption schemes that go beyond standard offerings, creating multiple layers of protection for particularly sensitive identity data.
4. No Vendor Lock-in: Building your own IAM platform frees your organization from the constraints of vendor dependencies. This independence means you're not tied to a particular company's business decisions, product roadmap, or pricing strategies. If a vendor decides to sunset a feature your business relies on or dramatically increases licensing costs, organizations using off-the-shelf solutions may find themselves scrambling to adapt.
Custom solutions also shield you from the impacts of acquisitions and mergers in the IAM market, which can often lead to discontinued products or significant changes in service quality and support. With your own platform, you maintain continuity regardless of market fluctuations.
5. Customized Compliance Implementation: Regulatory compliance requirements for identity management vary significantly across industries and regions. A custom IAM platform allows you to design compliance features that precisely address your specific regulatory landscape without unnecessary overhead.
For example, a custom platform can be built with GDPR's right to be forgotten as a core architectural principle rather than an afterthought. Healthcare organizations can design authentication workflows that inherently enforce HIPAA requirements. Financial institutions can implement multi-factor authentication schemas that directly align with specific banking regulations in their operating regions.
### Drawbacks of a Custom-built IAM Platform
While the benefits of custom-built IAM solutions are compelling, they come with significant challenges that organizations must carefully consider. The reality is that identity management is a specialized field requiring deep expertise in security, performance optimization, and regulatory compliance. Building your own platform means taking on the full burden of these complexities—often pulling focus and resources away from your core business objectives. The following drawbacks highlight why many organizations ultimately find that the apparent freedom of a custom solution can become a costly constraint.
1. Security Issues: A significant risk of building your own authentication server lies in its generally higher probability of security issues, which is usually due to a disproportionate time spent on building and not security implementation. Since keeping your users’ data safe is among the greatest responsibilities of the platform and the primary task of an IAM , it is essential to make sure an adequately established security system is given. One of the most obvious advantages specialized vendors have over DIY developers is the possession of a dedicated team with cybersecurity and software engineering expertise. The members of these teams can utilize their knowledge to create the best possible security system based on their diverse experiences.
IAM vendors commonly offer advanced security features, such as support for multi-factor authentication (MFA) and security keys (Yubikey etc.). Another security aspect where third-party IAM solutions prevail is pattern recognition: they can prevent attacks more easily due to their large user base, whereas a custom-made solution does not possess enough data to recognize suspicious patterns.
Keeping up with authentication best practices and standards becomes another insurmountable task for custom-built platforms, whereas IAM vendors can ensure compliance and adherence to standards.
2. Cost of Maintenance: Contrary to popular belief, you will likely find that building your own authentication server is not cheaper in the long run. While you might initially save money, that will quickly be compensated by the cost of development, maintenance, troubleshooting, upgrades, and the resources themselves that are needed for these procedures. Furthermore, you might find that unexpected expenses arise later on in your software’s lifetime: while initially you will likely implement a simple username + password login system, due to the high security requirements of a well-functioning authentication solution, you will most likely need to expand it with more complex features (f.e. Multi-Factor-Authentication, passwordless login options and more social logins).  Also, since your primary business is likely in an unrelated field to the IAM itself, the inevitable shift in your working context would entail additional costs. When considering a custom-built solution, it is therefore beneficial to evaluate if the needed investments over the lifetime of your product are ultimately less than the amount you would have to pay for the one-time fee of the purchasable alternative.  
Add in the scale by a factor of (n) to address a multi-tenancy requirement for each customer with their own settings, and the cost of maintenance grows exponentially.
3. Expensive, in all aspects: When creating anything from scratch, you should probably reckon with a lengthy production process. This not only delays the “time to value” of your business-critical applications as you first need to build the IAM platform before you can make your application available to your users.  This also applies to developing a service; given that authentication solutions require lots of API programming and complicated security features, fully building one might take at least a year as a full-time job. Since this service will handle sensitive data, the development of an adequately functioning security system also involves constant testing and optimizing, which should not be neglected to save time. The need for custom features also extends to the product phases well beyond the initial development: keeping your application functional and up to date requires you to additionally establish a maintenance system that will serve this purpose. Using an already established IAM solution would therefore likely save you several years of time, and money spent on essential resources.

![](https://cdn.sanity.io/images/y3uu7rkl/production/deeec64e2aa7e46f68c8de9addac4090ae2f3c80-2940x1656.png)
*Calculations based on our analysis*
### Benefits of Buying an IAM Platform
While custom-built IAM solutions offer some advantages, after examining the complex challenges of building one, it becomes clear why many organizations ultimately choose to purchase a dedicated IAM platform from specialized vendors. These purpose-built solutions offer numerous advantages that directly address the pain points of custom development.
1. Industry-Leading Security Expertise: Specialized IAM vendors focus exclusively on identity security, employing teams of security experts who dedicate their careers to staying ahead of emerging threats. This concentrated expertise translates into robust security practices that would be difficult for most organizations to replicate internally. Professional IAM solutions typically offer:
Regular security audits and penetration testing with third party partners
Rapid response and mitigation of vulnerabilities
Advanced threat detection and prevention capabilities
Compliance with the latest security standards and best practices and certifications
2. Faster Time to Market: Implementing a pre-built IAM solution dramatically accelerates your deployment timeline. What can typically take months or years to develop in-house can often be set up in weeks or even days with a vendor solution. This quick implementation means:
Your core products and services launch faster
Security enhancements reach your users more quickly
Development resources stay focused on your business differentiators
You realize return on investment sooner
3. Reduced Total Cost of Ownership: While the upfront licensing costs of purchased IAM solutions are visible line items in your budget, they typically represent a fraction of the total cost of building and maintaining a custom platform especially if you factor in the development time. A comprehensive IAM solution hence eliminates:
* Development costs for initial implementation of the security features
* Ongoing expenses for security updates and patching
* Infrastructure and operational overhead, especially for SaaS users
* Costs associated with specialized security talent acquisition and retention
* Expenses related to compliance certification and auditing

![](https://cdn.sanity.io/images/y3uu7rkl/production/6b2ba627a001746cc86e4499c29d15ae5f898fc1-2940x1648.png)

4. Continuous Innovation Without Internal Resources: Professional IAM vendors continuously improve their platforms, incorporating new authentication methods, security enhancements, and usability features as they emerge in the market. This ongoing innovation happens without draining your internal resources, allowing you to:
* Benefit from industry advancements automatically
* Support new standards and protocols without additional development
* Offer cutting-edge security features to your users
* Stay competitive with larger organizations that have more resources
5. Scalability and Reliability: Enterprise-grade IAM platforms are built from the ground up to handle massive scale with exceptional reliability. These solutions typically offer:
* High-availability architectures with redundancy built in
* Elastic scaling to handle usage spikes
* Global distribution for performance optimization
* Proven reliability under extreme load conditions
* Comprehensive monitoring and alerting options
6. Simplified Compliance Management: Managing compliance across multiple regulations (GDPR, HIPAA, SOC2, ISO27001, etc.) requires significant expertise and ongoing attention. Dedicated IAM platforms typically:
* Maintain compliance certifications so you don't have to
* Provide detailed audit logs and reporting
* Offer pre-built compliance frameworks for various industries
* Stay updated with evolving regulatory requirements
* Simplify your compliance audits with ready documentation
7. Professional Support and Expertise On-Demand: When issues arise (as they inevitably do), having access to specialized support can mean the difference between minor inconvenience and major business disruption. Established IAM vendors provide:
* 24/7 technical support from identity specialists
* Comprehensive documentation and implementation guides
* Professional services for complex deployments
* User community and knowledge sharing
* Training and certification programs


![](https://cdn.sanity.io/images/y3uu7rkl/production/18106bcce85f266ce752a3e24d3d7cba3b115fd6-2940x1654.png)

### Bringing the Best of Both Worlds with Zitadel 
Zitadel delivers enterprise-grade identity and access management without the development overhead of building your own solution from scratch. Unlike custom-built IAM systems that require significant engineering resources, ongoing maintenance, and security expertise, Zitadel provides a battle-tested, comprehensive solution out of the box. 
With Zitadel, organizations gain immediate access to modern authentication protocols, multi-tenancy support, robust user management, and authorization controls —all while avoiding the hidden costs, security vulnerabilities, and compliance challenges that often plague homegrown IAM implementations. By choosing Zitadel, your team can focus on core business objectives rather than reinventing complex identity infrastructure.
1. Developer-first, multi-tenant platform: As a developer-first multi-tenant platform, Zitadel gives you custom-level control with turnkey implementation - offering intuitive APIs, comprehensive SDKs, and detailed documentation that drastically reduces development resources while supporting complex multi-organization structures that would typically require months of custom coding. You can even build your own custom login UI using Zitadel's APIs while relying on its battle-tested security and standards implementation behind the scenes.
2. Flexible deployment: Zitadel offers the data sovereignty of custom solutions without the infrastructure burden. You have the ability to choose between the convenience of Zitadel Cloud with its zero-maintenance approach or the control of self-hosting in your own infrastructure - either way, you maintain full ownership of your identity data without the ongoing operational costs of a custom-built IAM platform.
3. Extensibility and Enterprise Integrations: Zitadel delivers adaptability at the level of a custom-built solution without the associated complexity of a custom-built IAM solution. Its extensive extensibility and enterprise integrations ensure seamless connection to your existing ecosystem through webhooks, actions, and pre-built connectors for enterprise systems, allowing for the same customization you get from building in-house without forking code, managing separate codebases, or compromising security.
### Get Started
Get started with  Zitadel, the comprehensive, ready-to-deploy Identity and Access Management platform  rather than building one from scratch. We offer the ideal authentication platform with flexible pricing, a variety of deployment options, extensive features, enterprise-grade security, and unlimited identities across all instances.

Have questions about authentication or anything else? Connect with us on the [Zitadel Discord Server](https://zitadel.com/chat). You can also find us on [LinkedIn](https://www.linkedin.com/company/zitadel/), [GitHub](https://github.com/caos/zitadel), [Bluesky](https://bsky.app/profile/zitadel.com), [Twitter](https://twitter.com/zitadel) or through our [website](https://zitadel.com/).

If you appreciate our work, please consider [giving us a star on GitHub](https://github.com/zitadel/zitadel). We value your support!

The Zitadel Identity and Access Management (IAM) platform offers a turnkey enterprise-grade platform for cloud-native organizations looking to move away from a custom-built IAM platform with modules that are expensive to maintain.

Stop Building and Maintaining Frankenstein IAM Platforms


[ZITADEL](https://zitadel.com) is an open source identity platform that addresses the challenges of self-service, authentication, and authorization by integrating them into your project. It supports multi-tenancy for business-to-business (B2B), identity brokering, multifactor/passwordless authentication, delegated access management, in-context audit trail, [OpenID Connect](https://openid.net/connect/), SAML 2.0, and [OAuth 2.0](https://oauth.net/2/). 

In contrast, [Firebase](http://firebase.google.com/) is a backend as a service (BaaS) that provides developers with a variety of tools and services to help them build quality applications. It's categorized as a NoSQL database platform because the data is stored in a JSON-like format.

With ZITADEL, you can avoid hours of creating, configuring, and operating complex authentication and authorization systems. Meanwhile, Firebase on the other end provides you with commodity features for all of your backend needs, including cloud messaging, testing, crashlytics, authentication, and real-time databases.

Developing with a powerful and feature-rich platform can be essential in creating a reliable and high-quality mobile and web application. It takes a lot of dedication and time to manage files and resources, server configuration, analytics, and other related operations.

In this article, you'll compare ZITADEL and Firebase authentication and look specifically at where they differ in regard to their authentication and authorization features, integrations, and architecture.

## ZITADEL vs. Firebase

ZITADEL and Firebase can both be used to achieve authentication and authorization in your application. However, there are a few factors, like authentication features and integrations, that can help you decide which platform is best for you. Let's take a look at the authentication features each platform offers:

### Firebase Authentication

The main goal of an authentication provider is to be able to identify each user in your application, which is where Firebase Auth comes into play. With Firebase, you have to obtain an authentication credential from the user in order to sign them into your application. The user's email address and password or an OAuth token from a third-party service can serve as these credentials. If you choose to upgrade to Firebase Authentication with Identity Platform, you can authenticate users on your platform with any identity provider that supports [OIDC](https://firebase.google.com/docs/auth/web/openid-connect) or [SAML](https://firebase.google.com/docs/auth/web/saml).

You can incorporate a quick sign-up and sign-in feature for your users using FirebaseUI Auth. By doing so, users spend less time creating profiles or signing up, which boosts conversion rates. Additionally, it tackles scenarios that can be tricky to manage appropriately in terms of security, such as [account recovery and account linkage](https://firebase.google.com/docs/auth/web/firebaseui). Furthermore, the Firebase SDK Authentication is also an authentication function you can include in your application. It gives you various authentication functions, including the following:

- **Email and password authentication:** Users that sign in with their email addresses and passwords can be created and managed using the Firebase Authentication SDK.
- **Third-party-powered authentication:** Google, Facebook, Twitter, and GitHub user accounts can be used to log in using the Firebase Authentication SDK's APIs.
- **Phone number authentication:** Users can be authenticated after receiving a one-time password (OTP) SMS message on their phones.
- Other authentication channels include custom authentication using a limited list of [federated identity providers](https://firebase.google.com/docs/auth/where-to-start#firebasesdk), any third-party identity providers on a [pricier plan](https://firebase.google.com/docs/auth#identity-platform), and anonymous authentication for temporary accounts.

Firebase authentication can also be achieved using an identity platform. You have the option to add an optional authentication feature (like multifactor authentication, blocking function, multi-tenancy, SAML, and OIDC) to your application using the [Identity Platform](https://firebase.google.com/docs/auth).

### ZITADEL Authentication

ZITADEL provides you with the option to use third-party-powered authentication to provide trust between your application and the users. For instance, if you set Google as an identity provider, ZITADEL can redirect the user to log in with their Google account and give ZITADEL access to take their credentials as a form of identification on the platform.

You can use the following authentication features with ZITADEL:

- You can register an OIDC client of your choice and add a ZITADEL callback redirect (make sure the provider is OIDC 1.0 compliant with a proper [discovery endpoint](/docs/guides/integrate/login-users). This will give your users the option to log into your ZITADEL-powered application using the OIDC authentication feature.
- You can use a SAML sign-in option that gives your users the ability to authenticate once and gain access to multiple secured parts of your application without resubmitting their credentials.
- You can choose to let your users log in with a traditional username and password.
- You can authenticate via external identities, such as Google, Microsoft, or Apple.
- You can force a user to register and use multifactor authentication through a universal second factor, such as OTP, alongside their pin.
- You can decide to use passwordless login authentication. Your user can either use device-dependent (e.g., fingerprint, face recognition, and [Windows Hello](https://support.microsoft.com/en-us/windows/learn-about-windows-hello-and-set-it-up-dae28983-8242-bb2a-d3d1-87c9d265a5f0)) or device-independent (e.g., [YubiKey](https://www.yubico.com) and [SoloKeys](https://solokeys.com)) access.
- You can use multi-tenancy authentication to allow a user to authenticate themselves once with authorizations in multiple organizations. It simplifies the whole authentication process for users regardless of their tenancy, while allowing you to have multiple organizations with different users. ZITADEL ensures each tenant has complete privacy regarding their data, a highly-customizable login flow, and on-demand scaling.

As you can see, both ZITADEL and Firebase provide numerous ways to authenticate your users. However, ZITADEL stands out in that it gives you open access to any third-party [identity broker](/docs/concepts/features/identity-brokering) without any complex pricing plans. You can use OIDC or SAML to connect with any third-party identity provider and provide your users with the authentication they want.

If you're in need of a quick authentication feature for your application, Firebase is a good option. However, if you need more advanced authorization, user self-service, and multi-tenancy features for your application, ZITADEL is the superior choice because it's built to handle your authentication needs, no matter the complexity of your application.

### Firebase Integrations

Programming in C++, Java, JavaScript, JavaScript/Node.js, Objective-C, and Swift is supported by the [Firebase SDK](https://firebase.google.com/docs/firestore/client/libraries). Database bindings and libraries with limited functionality in [Angular](https://github.com/angular/angularfire), [Backbone.js](https://github.com/googlearchive/backbonefire) and [Ember.js](https://github.com/FirebaseExtended/emberfire) are also supported.

For the uninitiated, bindings are basic mappings of APIs to in-code functions that carry out standard operations like CRUD. However, they're not as detailed as SDKs, and sometimes a binding scan can go beyond the basic CRUD operations and offer cosmetic improvements or alternatives to existing methods and features, in which case they are often referred to as auxiliary or supplementary bindings.

Google has added a few supplementary bindings and libraries like [FirebaseUI](https://github.com/firebase/firebaseui-web), [GeoFire](https://github.com/googlearchive/geofire), [Firebase Queue](https://github.com/FirebaseExtended/firebase-queue), and [FirebaseJobDispatcher](https://developer.android.com/topic/libraries/architecture/workmanager/). These auxiliary bindings add more functionality to your application, including [drop-in authentication with FirebaseUI](https://firebaseopensource.com/projects/firebase/firebaseui-web) and [real-time location queries with GeoFire](https://firebaseopensource.com/projects/firebase/geofire-android/).

Additionally, Firebase allows for integration with [Elasticsearch](https://www.elastic.co/what-is/elasticsearch) and the import of big JSON data collections. You can find out more about implementation in the official [Firebase docs](https://firebase.google.com/docs/guides).

### ZITADEL Integrations

ZITADEL is younger than Firebase and provides gRPC, gRPC-web, and Rest APIs, which are supported by most common programming languages, including Angular, React, [Flutter](https://flutter.dev/), [Next.js](https://nextjs.org/), Java, Python, Go, .NET, and [Dart](https://dart.dev/). In addition, you can opt for either the cloud SaaS version or [self-host](/docs/guides/deploy/overview) it using the [open-sourced repo](http://github.com/zitadel/zitadel). To see a few different ways integrations can be used, check out [ZITADEL's official docs](/docs/sdk-examples/introduction).

ZITADEL provides ample APIs and SDKs to help you integrate with most programming languages. You can also easily integrate your apps with open standards such as OpenID Connect, OAuth 2.0, SAML, etc., when using ZITADEL.

Both ZITADEL and Firebase integrate with a wide range of programming languages, which gives you the ability to work with whatever language or framework you're most comfortable with.

### Firebase Use Cases

As previously stated, Firebase is a full-featured BaaS platform, offering all the capabilities required to swiftly create complex, collaborative apps that can support millions of users. The architecture of Firebase is designed to work in any of the following situations:

* **Firebase-powered application:** Firebase sits in between your application and your client. All you need to worry about is the client side of the application, while Firebase handles the complex backend structure. Resource sharing and storage are both handled by Firebase.
* **Firebase-powered application with server-side:** Firebase is positioned between the server and clients in this architecture. In other words, your server interacts with Firebase to send and receive resources from clients. You can decide who has full access to the data and how it should be handled using your security settings and Firebase rules. Then your server code keeps an eye out for any data changes made by clients and reacts as needed. Even though you're still running a server, Firebase is handling all the heavy lifting of scale and real-time updates.
* **Firebase-powered functionality in an existing application:** In this architecture, Firebase can be integrated alongside your existing server. Your clients will establish connections to both your server and Firebase, using Firebase to power your real-time features while keeping the rest of your application running smoothly.

Using any of these capabilities, you can add a real-time notification system for your users, integrate a chat feature into your website, produce a real-time comment feed, and more. An easy way to start using Firebase is to test out some of its minor functionalities.

### ZITADEL Use Cases

ZITADEL offers you much more control over how your IAM system is deployed. You can use ZITADEL in any of the following use-cases:

* **Out-of-the-box integration with your apps:** ZITADEL can offer you a central login experience that can handle all your users in one place. When a user requests to authenticate, you send them over to the central login widget of ZITADEL to retrieve their details once they're successfully authenticated.
* **Multi-tenancy support:** When building business-to-business (B2B) apps, you need to enable your customers to have control over their authentication flow. They should be able to choose and customize things like branding, federation, and policies. This is often not possible with providers like Firebase Auth because it was originally intended for business-to-consumer (B2C) apps. ZITADEL enables you to support your B2B customers and provide their users with the best experience possible.
* **Self-service experience:** As mentioned above, B2B customers need control over their branding and access rules, and it's not scalable for you to approve or moderate changes. ZITADEL offers you a complete self-service platform that your customers can use to easily self-manage their projects in your apps.
* **Using existing identities:** Many B2B customers want to rely on established third-party identity providers or their own company logins instead of going down the generic email-password route. Federated login flows only partly solve this problem because they don't allow you to choose *any* third-party provider, and reusing a company login is an even more complex task. ZITADEL works best in this case since you can allow your customers to use common protocols like OIDC and SAML to register any recognized identity provider with the IAM solution and manage it on a centralized platform.

Internally, ZITADEL is composed of [two principal architectural styles](https://zitadel.com/docs/concepts/architecture/software): command and query responsibility segregation (CQRS), and event sourcing (ES). Combining ES and CQRS improves ZITADEL's consistency and offers numerous advantages.

Due to the nature of Event Sourcing, ZITADEL has the singular ability to create a robust audit record of everything that occurs on its resources—all while maintaining storage costs and audit trail length.

In summary, if your application needs backend functionality, authentication needs, or real-time data alongside your existing server, Firebase gives you the ability to integrate it with your application at any stage (development or production). Meanwhile, ZITADEL's easy integration into your application helps you handle the authentication, authorization, and self-service parts of your application. If you're looking for a platform that will manage your user identity and provide you complete control over it, ZITADEL is the superior choice.

## Conclusion

In this article, you learned about the key differences between Firebase Authentication and [ZITADEL](https://zitadel.com/). You saw how they compared to each other and how you can integrate them into your project, their architectural choices, as well as the different features they offer.

Firebase in general provides you with backend functions that you can use while building your application's frontend or when scaling your applications. In contrast, ZITADEL gives you flexibility with your programming language and unlimited authentication options.

[ZITADEL](https://zitadel.com/) is an open source identity management platform that provides you with a wide range of features like OpenID Connect, SAML 2.0, OAuth 2, FIDO2, OTP, and an unlimited audit trail. With ZITADEL, you can solve all your authentication and authorization needs. Check out the ZITADEL repo and give us a [GitHub star](https://github.com/zitadel/zitadel). We appreciate the feedback.


*This article was contributed by [Aransiola Ayodele](https://portal.draft.dev/writers/rec2hTGbxNzwgQITY).*


The purpose of this article is to guide readers on what are the differences between ZITADEL and Firebase

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