Auth0 vs FusionAuth
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Auth0 is the stronger AI pick in Identity & Access Management: it has a visibility score of 17.2 versus 1 for FusionAuth, and ranks ahead in 100% of the answers that name both.
Choose Auth0 if…
- You want the brand AI engines rank higher (17.2 vs 1)
- You want a lower entry price ($35 vs $162)
- You need SOC 2 or ISO 27018 coverage
- Developer-friendly customer identity and authentication
Choose FusionAuth if…
- AI answers describe it more positively (100% vs 47% positive)
- You need a self-hosted or on-premises option
- You need SOC 2 Type II or HIPAA BAA available or GDPR coverage
- Clear public pricing tiers
AI visibility side by side
Latest weekly run · Nov 3
| Metric | Auth0 | FusionAuth |
|---|---|---|
| Visibility score | 17.2% | 1% |
| Change vs last week | up+2.6% | up+1% |
| Rank in Identity & Access Management | #5 | #29 |
| Share of voice | 5.4% | 0.4% |
| Mentions this run | 17 | 1 |
| Positive in AI answers | 47% | 100% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Auth0 +3.3999999999999986pp · FusionAuth +0.6pp over 1 weekly runs.
Engine by engine
Auth0 leads on 3 of 3 engines
Head to head in AI answers
1 engine answers name both brands
| Prompt | Engine | Auth0 | FusionAuth |
|---|---|---|---|
| Top identity and access management platform options for B2B SaaS companies | ChatGPT | #4 | #9 |
Features, pricing & fit
| Dimension | Auth0 | FusionAuth |
|---|---|---|
| Pricing model | Usage-based | Usage-based |
| Entry price | Free; paid from $35 / mo | Free; paid from $162 / mo |
| Free plan | Yes | Yes |
| Deployment | Cloud (multi-tenant public cloud) or private cloud | Self-hosted, on-premises, hybrid, air-gapped, or FusionAuth Cloud (dedicated hosting) |
| Compliance | SOC 2, ISO 27001, ISO 27018 | SOC 2 Type II, ISO 27001, HIPAA BAA available, GDPR |
| Support | Community forum, Standard support, Premier support, 24/7 support | Community forums and GitHub, Email support, 24/7 email and phone support, Private Slack channel |
| Founded | 2013 | 2009 |
| Headquarters | Bellevue, WA, United States | Broomfield, CO, United States |
| Employees | — | 51–200 |
| Funding | Series D · $332M raised | Growth (led by Updata Partners) · $65M raised |
| Best for | Development teams adding login, SSO and authorization to B2C apps, B2B SaaS and AI agents | Developer and engineering teams that need customer authentication they can self-host or run on dedicated infrastructure. |
Plans side by side
Auth0
FusionAuth
Pros and cons
Themes from the AI answers that mention each brand
Auth0
- Developer-friendly customer identity and authentication
- Strong, customizable CIAM for customer-facing applications
- Default favorite for developer-centric consumer identity
- Published plan tiers and pricing with clear limits
- Free tier for getting started
FusionAuth
- Clear public pricing tiers
- Fully featured open-source self-hosted option
- No forced enterprise sales
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 98.8%·next run
Cite as: SlateIndex, “Auth0 vs FusionAuth”, https://slateindex.ai/compare/auth0-vs-fusionauth, data of Nov 3, 2026. Licence: CC BY 4.0.