Open5e vs Zelda
Same instrument, two spec sheets — measured, not claimed.
Open5e vs Zelda: common questions
Which is more reliable, Open5e or Zelda?
On our scheduled checks, Zelda leads on measured uptime — Open5e 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 Open5e and Zelda need an API key?
Neither needs a paid key — Open5e 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 Open5e and Zelda from the browser?
Yes — both Open5e 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 Open5e and Zelda free for commercial use?
Open5e 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.