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APIs.guru vs serpstack

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

APIAPIs.guruHEALTHY97serpstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms266492
P95 · ms14211442
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree and open, no keyFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

APIs.guru vs serpstack: common questions

Which is more reliable, APIs.guru or serpstack?

On our scheduled checks, APIs.guru leads on measured uptime — APIs.guru at 100% versus serpstack at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, APIs.guru or serpstack?

APIs.guru has the lower median latency in our checks — APIs.guru responds in 266 ms versus serpstack at 492 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 APIs.guru and serpstack need an API key?

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

Can I call APIs.guru and serpstack from the browser?

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

Are APIs.guru and serpstack free for commercial use?

APIs.guru has unclear commercial terms, and serpstack 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.