OnlineCompiler API alternatives

Compile and run code in 46 languages, with test-case judging and a Judge0-compatible endpoint. If it doesn't fit your project, here are the 5 best free Programming APIs to use instead in 2026, out of 5 in the directory.

For reference, OnlineCompiler API: 100% uptime (30 days) · HTTPS.

1. 1

   Mintlify API

   Online · 3526 ms

   For programmatically generating documentation for code.

   • 100% uptime (30 days)
   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
2. 2

   Judge0 CE API

   Online · 803 ms

   Online code execution system. A free programming API by Judge0 CE.

   • 100% uptime (30 days)
   • HTTPS

   apiKeyHTTPSCORS ?
3. 3

   Codeforces API

   Online · 586 ms

   Get access to Codeforces data.

   • 100% uptime (30 days)
   • HTTPS

   apiKeyHTTPSCORS ?
4. 4

   Hackerearth API

   Online · 1557 ms

   For compiling and running code in several languages.

   • 100% uptime (30 days)
   • HTTPS

   apiKeyHTTPSCORS ?
5. 5K

   KONTESTS API

   Online · 2032 ms

   For upcoming and ongoing competitive coding contests.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?

OnlineCompiler API vs alternatives

OnlineCompiler API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
OnlineCompiler	Required	Yes	No	100%	1113 ms	Not rated
Mintlify	Required	Yes	Yes	100%	3526 ms	Not rated
Judge0 CE	Required	Yes	Unknown	100%	803 ms	Not rated
Codeforces	Required	Yes	Unknown	100%	586 ms	Not rated
Hackerearth	Required	Yes	Unknown	100%	1557 ms	Not rated
KKONTESTS	No	Yes	Unknown	58.3%	2032 ms	Not rated

See also: best Programming APIs · all Programming APIs