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Lobsters vs The Calendar

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

APILobstersHEALTHY97The CalendarHEALTHY90
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms243588
P95 · ms11753550
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (US federal list per 5 U.S.C. § 6103)
Free tierFree — limits not publishedFree, no auth (per site)
Rate limitUnpublishedNone stated (site advertises no rate limit)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lobsters vs The Calendar: common questions

Which is more reliable, Lobsters or The Calendar?

Both are neck-and-neck — Lobsters and The Calendar each measure 100% 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, Lobsters or The Calendar?

Lobsters has the lower median latency in our checks — Lobsters responds in 243 ms versus The Calendar at 588 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 Lobsters and The Calendar need an API key?

Neither needs a paid key — Lobsters is callable with no signup, and The Calendar is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Lobsters and The Calendar from the browser?

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

Are Lobsters and The Calendar free for commercial use?

Lobsters has unclear commercial terms, and The Calendar 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.