Frequently asked questions

Quotas, languages, Docker and refunds.

How many submissions do I get?

Free accounts get 5 submissions per month and Premium accounts get 50. Your remaining quota is shown in the navigation bar, and the Free quota refills monthly. See the Pricing page for current limits.

Which programming languages are supported?

C#, Java, JavaScript, TypeScript, Python and Go. You pick a language when you start a challenge and get a starter project for it.

Do I need Docker?

Only for the CLI. Docker Desktop (or Docker Engine with Docker Compose v2) must be installed and running to build and test your solution. If you already run your app locally, codingchallenge test --local tests against it without Docker. See the CLI documentation.

Are results instant?

No. Each submission is queued, then built and tested in an isolated environment. Results appear on the submission page as soon as the run finishes.

Can I get a refund?

Yes, once per subscription: a full refund within 14 days of subscribing if you have used 10 or fewer Premium submissions (renewals excluded). Requesting one downgrades you to Free immediately. Details are in the Refund Policy.

Something is wrong. How do I get help?

See the Support page.