Practice coding interviews.
Free forever for Easy problems.

Solve real interview-style problems in JavaScript and Python. Your code runs entirely in your browser — no signup, no setup, no server.

Start practicing free See Pro — $1/mo
25
Problems
2
Languages
100%
In-browser

How it works

From problem to passing tests in under a minute.

1

Pick a problem

Browse 25 classic interview problems across Easy, Medium, and Hard — arrays, strings, dynamic programming, and more.

2

Write code

Code in JavaScript or Python in the built-in editor. Switch languages anytime; your drafts are kept per problem.

3

Run the tests

Hit Run to check visible test cases, then Submit to face the hidden ones. Everything executes locally in your browser.

Simple pricing

Start free. Upgrade when you're ready for the hard ones.

Free

$0 / forever
  • All 12 Easy problems, fully solvable
  • Full statements for every problem
  • JavaScript & Python in-browser
  • No account required
Start free
Most popular

Pro

$1 / month
  • Everything in Free
  • All Medium & Hard unlocked
  • Hidden test cases on Submit
  • Cancel anytime
Go Pro — $1/mo

Frequently asked questions

Everything else you'd want to know.

Yes. All Easy problems are free forever — full statements, code editor, and test runs included, no account required. Medium and Hard problems show full statements for free; running and submitting solutions for them requires CodeSprint Pro at $1/month.
Pro unlocks Run and Submit on all Medium and Hard problems, including hidden test cases on submission. One simple plan, cancel anytime.
JavaScript and Python. JavaScript runs in a sandboxed web worker; Python runs via Pyodide (Python compiled to WebAssembly). Both execute entirely in your browser — the first Python run downloads a ~10 MB runtime, once.
No. There are no accounts on CodeSprint. Your solved progress is stored only in your own browser's local storage, and clearing it resets your progress.
No. The editor, code execution, and test grading all run locally in your browser. Your code never leaves your device.
Pro billing is handled through our payment provider, where you can cancel anytime in a couple of clicks. You keep Pro access until the end of the billing period.
Anyone preparing for coding interviews or practicing data structures and algorithms — students, bootcamp grads, and working developers brushing up before interviews.