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Image-Charts vs NetworkCalc

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

APIImage-ChartsHEALTHY99NetworkCalcHEALTHY91
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d98.3%98.3%
P50 · ms80448
P95 · ms4993976
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree public API, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Image-Charts vs NetworkCalc: common questions

Which is more reliable, Image-Charts or NetworkCalc?

Both are neck-and-neck — Image-Charts and NetworkCalc each measure 99.02% 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, Image-Charts or NetworkCalc?

Image-Charts has the lower median latency in our checks — Image-Charts responds in 80 ms versus NetworkCalc at 448 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 NetworkCalc need an API key?

Neither needs a paid key — Image-Charts is callable with no signup, and NetworkCalc is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

Only NetworkCalc 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 NetworkCalc free for commercial use?

Image-Charts has unclear commercial terms, and NetworkCalc 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.