Deck of Cards vs Zelda
Same instrument, two spec sheets — measured, not claimed.
Deck of Cards vs Zelda: common questions
Which is more reliable, Deck of Cards or Zelda?
On our scheduled checks, Zelda leads on measured uptime — Deck of Cards at —% versus Zelda 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 Deck of Cards and Zelda need an API key?
Neither needs a paid key — Deck of Cards is callable with no signup, and Zelda is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Deck of Cards and Zelda from the browser?
Yes — both Deck of Cards and Zelda 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 Zelda free for commercial use?
Deck of Cards has unclear commercial terms, and Zelda 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.