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Callook.info vs GitHub Contribution Chart Generator

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

APICallook.infoHEALTHY94GitHub Contribution Chart GeneratorHEALTHY68
Uptime · 30d
Uptime · 90d100%79.4%
Uptime · 30d100%85.0%
P50 · ms4374374
P95 · ms11564992
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified (derived from public GitHub profile data)
Free tierFree — limits not publishedFree — no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs GitHub Contribution Chart Generator: common questions

Which is more reliable, Callook.info or GitHub Contribution Chart Generator?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus GitHub Contribution Chart Generator at 79.4% 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, Callook.info or GitHub Contribution Chart Generator?

Callook.info has the lower median latency in our checks — Callook.info responds in 437 ms versus GitHub Contribution Chart Generator at 4374 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 Callook.info and GitHub Contribution Chart Generator need an API key?

Neither needs a paid key — Callook.info is callable with no signup, and GitHub Contribution Chart Generator is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Callook.info and GitHub Contribution Chart Generator from the browser?

Only Callook.info is browser-friendly — it returns CORS headers over HTTPS. GitHub Contribution Chart Generator needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Callook.info and GitHub Contribution Chart Generator free for commercial use?

Callook.info has unclear commercial terms, and GitHub Contribution Chart Generator 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.