Deck of Cards vs TETR.IO
Same instrument, two spec sheets — measured, not claimed.
Deck of Cards vs TETR.IO: common questions
Which is more reliable, Deck of Cards or TETR.IO?
Both are neck-and-neck — Deck of Cards and TETR.IO 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, Deck of Cards or TETR.IO?
TETR.IO has the lower median latency in our checks — Deck of Cards responds in 245 ms versus TETR.IO at 139 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 Deck of Cards and TETR.IO need an API key?
Neither needs a paid key — Deck of Cards is callable with no signup, and TETR.IO is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Deck of Cards and TETR.IO from the browser?
Yes — both Deck of Cards and TETR.IO send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are Deck of Cards and TETR.IO free for commercial use?
Deck of Cards has unclear commercial terms, and TETR.IO 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.