Blazingly fast
Everything is cached, only affected nodes are recomputed.
Easy to use
Thorough documentation to get you rolling.
Ship everywhere
Build packages for BOCA, Codeforces and more.
Correctness is key
Seamless integration with the testlib library.
Think outside the box
First class support for interactive problems.
Define once, use everywhere
Declare your constraints as variables, reference them everywhere.
See who's using
Visualize your testset
$ rbx ui
Visualize your testset interactively, without leaving your terminal.
Check the test input, the expected output, and information about the origin of the test case.
Verify solutions
$ rbx run
Verify whether correct solutions pass, and incorrect solutions fail at least one testcase.
Define their expected verdict once, and let the tool verify it for you.
Stress test
$ rbx stress
Build a strong testset by generating random testcases that break incorrect solutions.
Ensure your correct solutions pass a stress test scenario and cover all edge cases.