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Reviewed · Updated 2026-06-16

Check.io

Offers coding challenges, assessments, and developer recruitment tools online.

Reviewed by the Conversion Gems editorial team ·
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Pricing
Free
Best for
Developers
Category
Security, Privacy & Backup
The bottom line

A fun, community-driven way to practice Python/TypeScript; free for most learners, with a cheap subscription (or earnable) for extras.

7.2
Our score
7.2 / 10
Conversion Gems editorial verdict
Free; Awesome from $4.99/mo
Features7/10
7 - 500+ missions, community solutions and classrooms, across two languages.
Value9/10
9 - mostly free, with a cheap and even earnable Awesome plan.
Ease of use8/10
8 - browser-based, fun and easy to start.
Ecosystem5/10
5 - classroom tools, but a niche platform.
Support5/10
5 - community support.
What it really is

A browser-based coding-game platform where you improve Python and TypeScript skills by solving puzzles on a map of islands - not a security tool.

Our take

It makes practice genuinely fun: 500+ gamified missions, and a strong community angle where you can study others' creative solutions, which teachers worldwide use as a classroom supplement. Most of it is free; the paid 'Awesome' plan removes ads and unlocks locked challenges and unrestricted solution analytics, and you can even earn Awesome for free via quest points.

Best for
Beginner-to-advanced coders practicing Python or TypeScript
Learners who enjoy gamified, puzzle-based practice
Teachers wanting a classroom coding-practice supplement
Not good for
People wanting a structured, full curriculum or video courses
Languages beyond Python and TypeScript
Anyone expecting a security or recruitment platform (it is a coding game)
Friction report
Time to value
Instant: sign up free and start solving missions in the browser - no setup.
Scale breakpoint
The free tier locks some challenges, shows ads and limits solution analytics; full access needs the Awesome plan (or earned quest points).
Walled garden
Low lock-in: it is a practice platform, free to leave; only premium features sit behind the subscription.

A look inside

Check.io product screenshot

Frequently Asked Questions

Alternatives

Step up

LeetCode or Codewars - larger problem sets and interview-prep depth.

Lighter alternative

freeCodeCamp - free, structured lessons if you want curriculum over games.

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