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Datamuse vs IPASIS

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

APIDatamuseHEALTHY94IPASISDEAD0
Uptime · 30d
Uptime · 90d92.2%0.0%
Uptime · 30d86.7%0.0%
P50 · ms180—
P95 · ms926—
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Datamuse vs IPASIS: common questions

Which is more reliable, Datamuse or IPASIS?

On our scheduled checks, Datamuse leads on measured uptime — Datamuse at 92.2% versus IPASIS at 0.0% 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 Datamuse and IPASIS need an API key?

Datamuse needs no key, while IPASIS requires a free API key. If you want to start calling without signup, reach for Datamuse first.

Can I call Datamuse and IPASIS from the browser?

Neither sends browser-friendly CORS headers reliably, so call Datamuse and IPASIS from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Datamuse and IPASIS free for commercial use?

Datamuse has unclear commercial terms, and IPASIS 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.