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Energy-Charts API vs GitHub Contribution Chart Generator

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

APIEnergy-Charts APINEW—GitHub Contribution Chart GeneratorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (derived from public GitHub profile data)
Free tierFree — limits not publishedFree — no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Energy-Charts API vs GitHub Contribution Chart Generator: common questions

Which is more reliable, Energy-Charts API or GitHub Contribution Chart Generator?

On our scheduled checks, GitHub Contribution Chart Generator leads on measured uptime — Energy-Charts API at —% versus GitHub Contribution Chart Generator 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 Energy-Charts API and GitHub Contribution Chart Generator need an API key?

Neither needs a paid key — Energy-Charts API 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 Energy-Charts API and GitHub Contribution Chart Generator from the browser?

Only Energy-Charts API 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 Energy-Charts API and GitHub Contribution Chart Generator free for commercial use?

Energy-Charts API 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.