Candidate limits
Understanding limits to ensure server performance
While you are able to invite unlimited candidates on Coderbyte, we do have limits on the number of simultaneous candidates for server performance reasons. Less than 1% of our customers ever approach any of the limits.
Trial limits
During a trial period, you can see the results for up to 5 candidates. Start your subscription to access more results.
Concurrency limits
On legacy and annual plans, there is a concurrency limit of 50 candidates that can take your assessments simultaneously. This is an account-wide limit, not a limit per assessment.
This means you can invite 500 candidates at the same time, but only your concurrency limit will be allowed to enter and take an assessment. The rest will be in a virtual waiting room and told to retry entering the assessment in a few minutes.
There is no concurrency limit on credit-based plans.

Once candidates start leaving or completing the assessment, more candidates will be able to click begin to start their assessments. Higher concurrency limits are offered on our Enterprise tier.
Container limits
On self-service plans, there is a limit of 30 containers per month across assessments and live interviews. A container is started for any custom challenge of the following types:
- Jupyter
- VS Code
There are no limits when creating custom challenges in our native IDE. Contact your account manager about upgrading to Enterprise and increasing this monthly container limit. You can see your current monthly container count and limit in your Billing settings under Limits.