Judge0 CE API alternatives

Online code execution system. A free programming API by Judge0 CE. If it doesn't fit your project, here are the 4 best free Programming APIs to use instead in 2026, out of 4 in the directory.

For reference, Judge0 CE API: HTTPS.

1
Mintlify API
Online · 1227 ms
For programmatically generating documentation for code.
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS
2
Codeforces API
Online · 479 ms
Get access to Codeforces data.
- HTTPS
apiKeyHTTPSCORS ?
3
Hackerearth API
Online · 1521 ms
For compiling and running code in several languages.
- HTTPS
apiKeyHTTPSCORS ?
4K
KONTESTS API
Last check failed
For upcoming and ongoing competitive coding contests.
- No API key needed
- HTTPS
No authHTTPSCORS ?

Judge0 CE API vs alternatives

Judge0 CE API compared with its alternatives
API	API key	HTTPS	CORS	Uptime	Response	Rating
Judge0 CE	Required	Yes	Unknown	Up	596 ms	Not rated
Mintlify	Required	Yes	Yes	Up	1227 ms	Not rated
Codeforces	Required	Yes	Unknown	Up	479 ms	Not rated
Hackerearth	Required	Yes	Unknown	Up	1521 ms	Not rated
KONTESTS	No	Yes	Unknown	Down	–	Not rated

Head-to-head comparisons

Judge0 CE API alternatives FAQ

What is the best free alternative to the Judge0 CE API in 2026?

The top-ranked free alternatives to the Judge0 CE API are Mintlify API, Codeforces API and Hackerearth API, all in the Programming category. Rankings combine access (API key, HTTPS, CORS), daily uptime checks and developer ratings.

Is there a Judge0 CE API alternative that doesn't need an API key?

Yes: KONTESTS API work without an API key, unlike the Judge0 CE API, which uses apiKey authentication.

Is there a Judge0 CE API alternative I can call from the browser?

Mintlify API support CORS, so front-end JavaScript can call them directly.

How many Programming APIs are similar to the Judge0 CE API?

The directory lists 4 other free Programming APIs. This page compares the top ones side by side.