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Free Dictionary API vs Sofiaplan

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

APIFree Dictionary APIHEALTHY90SofiaplanHEALTHY80
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms6741666
P95 · ms21963475
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

Free Dictionary API vs Sofiaplan: common questions

Which is more reliable, Free Dictionary API or Sofiaplan?

Both are neck-and-neck — Free Dictionary API and Sofiaplan each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Free Dictionary API or Sofiaplan?

Free Dictionary API has the lower median latency in our checks — Free Dictionary API responds in 674 ms versus Sofiaplan at 1666 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Free Dictionary API and Sofiaplan need an API key?

Neither needs a paid key — Free Dictionary API is callable with no signup, and Sofiaplan is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Free Dictionary API and Sofiaplan from the browser?

Only Free Dictionary API is browser-friendly — it returns CORS headers over HTTPS. Sofiaplan needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Free Dictionary API and Sofiaplan free for commercial use?

Free Dictionary API has unclear commercial terms, and Sofiaplan 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.