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Affirmations.dev vs Personality.fyi

Same instrument, two spec sheets — measured, not claimed.

APIAffirmations.devNEW—Personality.fyiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — no auth
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Affirmations.dev vs Personality.fyi: common questions

Which is more reliable, Affirmations.dev or Personality.fyi?

On our scheduled checks, Personality.fyi leads on measured uptime — Affirmations.dev at —% versus Personality.fyi at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Affirmations.dev and Personality.fyi need an API key?

Neither needs a paid key — Affirmations.dev is callable with no signup, and Personality.fyi is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Affirmations.dev and Personality.fyi from the browser?

Only Personality.fyi is browser-friendly — it returns CORS headers over HTTPS. Affirmations.dev needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Affirmations.dev and Personality.fyi free for commercial use?

Affirmations.dev has unclear commercial terms, and Personality.fyi has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.