{"slug":"authsignal","name":"Authsignal","domain":null,"verdict":"As of 2026-08-04, ChatGPT, Claude, Gemini collectively rank Authsignal #5 of 9 for passkey authentication apis for mobile apps. Source: https://modelsagree.com/product/authsignal (modelsagree.com, CC BY 4.0).","best_rank":5,"categories":1,"entries":[{"slug":"best-passkey-authentication-apis-for-mobile-apps","title":"Best passkey authentication APIs for mobile apps","rank":5,"of":9,"score":3,"appearances":1,"modelRanks":{"ChatGPT":3},"reason":"Excellent retrofit option with native Swift, Kotlin, React Native, and Flutter SDKs, a FIDO-certified server, adaptive MFA, fallbacks, analytics, and no required identity-provider migration","reasons":[{"model":"ChatGPT","reason":"Excellent retrofit option with native Swift, Kotlin, React Native, and Flutter SDKs, a FIDO-certified server, adaptive MFA, fallbacks, analytics, and no required identity-provider migration"}],"fixes":[{"model":"ChatGPT","fix":"Production plans start around $1,099 per month, putting it outside the practical range of most small apps"}],"updated":"2026-08-04","api":"https://modelsagree.com/api/v1/best/best-passkey-authentication-apis-for-mobile-apps.json"}],"page":"https://modelsagree.com/product/authsignal","check":"https://modelsagree.com/check?q=Authsignal","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}