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Advice Slip vs Affirmations.dev

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

APIAdvice SlipNEW—Affirmations.devNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Advice Slip vs Affirmations.dev: common questions

Which is more reliable, Advice Slip or Affirmations.dev?

On our scheduled checks, Affirmations.dev leads on measured uptime — Advice Slip at —% versus Affirmations.dev 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 Advice Slip and Affirmations.dev need an API key?

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

Can I call Advice Slip and Affirmations.dev from the browser?

Only Advice Slip 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 Advice Slip and Affirmations.dev free for commercial use?

Advice Slip has unclear commercial terms, and Affirmations.dev 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.