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Image-Charts vs Sheetsu

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

APIImage-ChartsHEALTHY99SheetsuHEALTHY92
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d98.3%100%
P50 · ms80572
P95 · ms4991259
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublished90 req/window · 89 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Image-Charts vs Sheetsu: common questions

Which is more reliable, Image-Charts or Sheetsu?

On our scheduled checks, Sheetsu leads on measured uptime — Image-Charts at 99.02% versus Sheetsu at 100% 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, Image-Charts or Sheetsu?

Image-Charts has the lower median latency in our checks — Image-Charts responds in 80 ms versus Sheetsu at 572 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 Image-Charts and Sheetsu need an API key?

Image-Charts needs no key, while Sheetsu requires a free API key. If you want to start calling without signup, reach for Image-Charts first.

Can I call Image-Charts and Sheetsu from the browser?

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

Are Image-Charts and Sheetsu free for commercial use?

Image-Charts has unclear commercial terms, and Sheetsu 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.