What I appreciate most about FusionAuth is how seamlessly it balances strong multi-factor authentication (MFA) with flexible integration into our existing infrastructure. The Duo Push-style interface, where users can just tap a notification instead of putting in codes, makes it more easier for people to use, even teams who aren't very tech-savvy. We’ve even been able to scale usage across over 2,000 endpoints without breaking a sweat. Review collected by and hosted on G2.com.

The initial setup, especially configuring SSO with on-prem Active Directory or federated 365 domains, required a lot of careful reading and re-reading of documentation. It’s not something you want to rush, and integration with legacy systems wasn’t as plug-and-play as we’d hoped. Sometimes, the authentication pop-ups don’t appear unless the app is manually opened, which frustrates some of our users. Review collected by and hosted on G2.com.

FusionAuth's ability to concentrate everything I need into one, simple platform appeals most to me. FusionAuth provides one tidy dashboard where all of my professional apps sit; I no longer have to go through bookmarks or balance several logins to identify the correct tools. Not only tools, the single sign-on and multi-factor authentication are daily lifesaver. It feels like my entire workflow got a speed boost and a security upgrade all at once. Review collected by and hosted on G2.com.

The multi-step login, especially with MFA, can feel a bit tedious—there have been moments where codes don’t sync or I need to retry a few times. Also, switching devices (especially phones) messes with the setup and isn't as seamless as it should be. And compared to a few competitors like Okta or Auth0, FusionAuth's UI feels a little more functional than refined. Review collected by and hosted on G2.com.

FusionAuth's seamless interaction with on-site and cloud-based solutions is what most appeals about it. It has been quite simple to set up roles, control user access, and apply SSO throughout several SaaS systems. It also has strong API support and seamlessly incorporate into our CI/CD processes which have greatly delighted me. Review collected by and hosted on G2.com.

One drawback I have observed is that, like Entra ID P2, some of the sophisticated security and identity governance tools call for premium licensing. Furthermore, especially in troubleshooting, the on-site synchronizing mechanism might be more open and user-friendly. Although FusionAuth is quite flexible, mass actions usually call for scripting knowledge—PowerShell in other platforms or custom CLI tools here—which might not be perfect for non-technical teams. Review collected by and hosted on G2.com.

I love how FusionAuth lets me own my data and run everything on-premise, which gives me a level of control that SaaS solutions like Auth0 just don’t offer. Setting it up was smooth and the API-first design and thorough documentation also meant I didn’t have to guess or dig through forums. It’s refreshing to see a platform that doesn’t get in my way when I want to tweak things deeply, even with custom themes and tenant-specific configurations. Review collected by and hosted on G2.com.

The UI is functional but not exactly delightful—it’s very utilitarian. Also, multi-tenancy is great, but it can feel a bit over-complicated at times, especially when managing separate branding per tenant. Finally, while the documentation is robust, some edge-case behaviors around SSO and JWT token handling could be better clarified. Review collected by and hosted on G2.com.

What I like most about FusionAuth is how incredibly easy it is to integrate into our applications, especially when working under tight deadlines. Its adaptability with social logins changes everything. I have used it for minimal setup single sign-on and two factor authentication. The Universal Login function also made our sign-in process flawless on several platforms. It’s one of the few tools I’ve worked with that feels like it was built with developers in mind. Review collected by and hosted on G2.com.

The only real drawback I’ve noticed is the pricing as your usage scales — it can become a concern for startups or smaller teams. While support is generally helpful, having more instant, real-time assistance for critical production issues would be great. FusionAuth occasionally lacks the brand-based confidence found inAuth0 or Okta, which might concern some stakeholders. Review collected by and hosted on G2.com.

What we truly like is that it is quite seamless to utilise several separate client environments with only a single FusionAuth instance. The flexibility of the theming of our online onboarding process of new B2B customers has allowed us to add a branded login experience without any glitches. We also found the custom data fields so helpful in assigning specific fields of data to user profiles, in order to drive some of our internal analytics. Review collected by and hosted on G2.com.

The configuration settings that are not used often, at times, are a little less transparent to navigate the console. We also would have liked to see an easier way to export/import whole application setups between our development and production servers. There was also a steep learning curve to using some of the advanced webhook event triggers, although this got easier as time went on. Review collected by and hosted on G2.com.

What I like most about FusionAuth is its flexibility. It’s really intuitive to set up. I’m not a full-time developer, but I’m pretty sure I can configure logins, SSO, and integrations in a much easier way without spending days reading documentation. Fine-grained customization allowed me to form the login experience around my company’s brand perfectly, a process that other avenues made extremely cumbersome. It feels like the control is with me and not that I require external consultants. Review collected by and hosted on G2.com.

The main drawback is the learning curve once you want to go beyond the basics. Some of the more advanced workflows, such as complex triggers or esoteric identity provider integrations, take a bit of trial and error. Also, while being more approachably priced than Auth0, the add-ons can add up if you’re not careful. Review collected by and hosted on G2.com.

FusionAuth has been very easy to integrate with, supports all of our requirements, including a vendor supported terraform module, and the admin/management UI is easy to work with and navigate. Developers were able to adapt easily to the new provider and new features have been very easy to implement. Their customer support has been fabulous when we needed them. We utilize FusionAuth for all systems in all environments. Review collected by and hosted on G2.com.

There is one nagging bug that we would love fixed that happens rarely but it's a difficult fix I guess and still has not been released. Review collected by and hosted on G2.com.

What really won me over with FusionAuth is how naturally it fits into our Microsoft-heavy environment. Setting up SSO across Outlook, Teams, and SharePoint felt like flipping one big switch — suddenly, people weren’t forgetting passwords or pinging IT for access issues every other day. Conditional Access is one of those features I didn’t know I needed until I had it; I can allow access based on location or device, which has been huge for our remote team. Also, being able to roll out MFA using the Microsoft Authenticator app made our compliance team very happy without annoying our staff. Review collected by and hosted on G2.com.

The initial setup almost broke me. Trying to integrate FusionAuth with our older on-prem Active Directory was like stitching two universes together, and don’t get me started on SAML — it feels half-baked compared to Okta’s clean implementation. Also, some of the policies become a labyrinth over time; one misstep and you’re locked out of your own admin portal wondering what went wrong. Review collected by and hosted on G2.com.

FusionAuth has been a bit of a game-changer for us—not in the flashy, overhyped way some tools promise to be, but in a grounded, reliable kind of way. What I’ve come to appreciate is how it quietly takes care of the identity chaos that used to haunt our stack. Setting up OAuth2 and SSO was surprisingly smooth; I had our core app talking to FusionAuth in under ten minutes, which honestly shocked me after wrestling with tools like Keycloak in the past. Review collected by and hosted on G2.com.

Multi-tenant setups took some brainpower and trial-and-error, especially since our team doesn’t live and breathe IAM. The reporting side also feels undercooked—it gives you the basics, but if you’re used to slicing and dicing access logs like you can with tools like Okta, you’ll feel a bit boxed in. And while support is helpful, I’ve had moments where I wished for a bit more than just a link to the docs when tackling edge-case scenarios. Review collected by and hosted on G2.com.