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CustomGPT.ai vs Sofiaplan

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

APICustomGPT.aiNEW—SofiaplanNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CustomGPT.ai vs Sofiaplan: common questions

Which is more reliable, CustomGPT.ai or Sofiaplan?

On our scheduled checks, Sofiaplan leads on measured uptime — CustomGPT.ai at —% versus Sofiaplan 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 CustomGPT.ai and Sofiaplan need an API key?

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

Can I call CustomGPT.ai and Sofiaplan from the browser?

Only CustomGPT.ai 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 CustomGPT.ai and Sofiaplan free for commercial use?

CustomGPT.ai 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.