FusionAuth vs Keycloak
Zero of fourteen models named FusionAuth first on the direct prompt; zero named Keycloak. FusionAuth was named by eight of the fourteen models and Keycloak by ten and FusionAuth carries 14 labels and Keycloak 15, so the shares are not directly comparable.
Named in two categories this edition.
Named in five categories this edition.
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the customer identity and access management page.
By framing
FusionAuthFirst choices, of fourteen modelsKeycloak
Across every category in the November 2026 Edition, FusionAuth and Keycloak were named in the same answer eighteen times, of the 52 answers naming FusionAuth and the 63 naming Keycloak. In those answers Keycloak took the first choice zero times and FusionAuth two.
Every model, every framing
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | |||||
| GPT-5.4 mini | | | ||||
| Gemini 3.5 Flash | | | ||||
| Perplexity Sonar | | | | | ||
| Grok 4.20 | | | ||||
| Mistral Small | ||||||
| DeepSeek V4 Flash | | | ||||
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | ||||
| Kimi K2 | ||||||
| GLM 4.7 FlashX | | |||||
| MiniMax M2.5 | ||||||
| GPT-6 Luna | ||||||
| Muse Glimmer 30B | |
FusionAuth Keycloak first choice named as an alternative argued againstblank: not namedEach cell is one answer, FusionAuth on the left and Keycloak on the right.The direct prompt
Neither was the first choice, one was named
1 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
13 of 14 modelsThe answer made no first choice from these two in this category.Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
FusionAuth3%#7 of 15Keycloak0%#14 of 15FusionAuth11%#– of 13Keycloak0%#– of 13What the models said about FusionAuth
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.
“For the most budget-conscious approach, FusionAuth and Keycloak stand out because they offer free self-hosted options with no per-user fees.” Claude Haiku 4.5 · budget prompt · first choice
“For most companies with a limited budget, I'd recommend starting with FusionAuth's free Community Edition” DeepSeek V4 Flash · budget prompt · first choice
“Best balance of cost + features: FusionAuth” GPT-5.4 mini · budget prompt · first choice
What the models said about Keycloak
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of four in this category shown.
“High Operational Burden: Open-source platforms like Keycloak are feature-complete... you assume 100% of the responsibility for hosting” Gemini 3.5 Flash · negative prompt · soft negative
“Even popular tools like Keycloak (which has seen rising popularity) require significant engineering effort to maintain.” Qwen 3.7 Flash · negative prompt · soft negative
“FusionAuth and Keycloak stand out because they offer free self-hosted options with no per-user fees” Claude Haiku 4.5 · budget prompt · first choice
“Lowest cash spend, higher engineering effort: Keycloak” GPT-5.4 mini · budget prompt · first choice
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.