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TL;DR - Exercism
- Free coding practice platform with 82 language tracks and 8,100+ exercises
- Unique human mentorship from volunteer developers alongside automated feedback
- Fully open-source and community-funded with no paid plans
Pricing: Free forever
Best for: Individuals & startups
Pros & Cons
Pros
- Completely free with no paid tiers or paywalls
- Human mentorship sets it apart from other coding platforms
- Covers 82 languages including niche ones like Gleam and Ballerina
- Exercises teach real-world idiomatic patterns, not just syntax
- CLI-first workflow mirrors professional development practices
- Active open-source community contributing exercises and mentoring
Cons
- Mentor availability varies by language and time of day
- No structured curriculum or certificates for career advancement
- Exercise difficulty curve can be steep in less-maintained tracks
- No real-time collaborative coding or pair programming features
Preview
Key Features
8,100+ coding exercises across 82 programming languagesAutomated code analysis with instant feedbackFree human mentoring from volunteer developersCLI tool for downloading and submitting exercises locallyIn-browser editor supporting all 82 language tracksProgressive difficulty from beginner to advancedIdiomatic learning focused on language-specific conventionsCommunity-driven exercise curation and mentorshipConcept-based learning paths within each trackOpen-source platform with transparent development
Pricing
Free
Exercism is completely free to use with no hidden costs.
What is Exercism?
Exercism is a free, community-funded platform for developing programming fluency across 82 languages. It combines 8,100+ coding exercises with automated analysis and voluntary human mentorship from experienced developers. Exercises progress from beginner to advanced, teaching idiomatic patterns specific to each language rather than generic coding. The platform supports both a CLI workflow for local development and a browser-based editor for instant practice.
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Exercism FAQ
Is Exercism really completely free?
Yes. Exercism is 100% free and will remain so. It is funded by community donations and sponsorships. There are no premium tiers, ads, or paywalls.
How does the mentoring work on Exercism?
After submitting an exercise solution, you can request mentoring. A volunteer developer reviews your code and provides feedback on style, idioms, and improvements specific to that language. Turnaround depends on mentor availability.
What programming languages does Exercism support?
Exercism offers 82 language tracks including Python, JavaScript, Rust, Go, Haskell, Elixir, C++, Java, TypeScript, and many more. Each track has its own set of exercises tailored to that language's idioms.
Can I use Exercism to learn my first programming language?
Yes. Each track includes beginner exercises and concept-based learning paths. However, Exercism focuses more on practice and fluency than teaching fundamentals from scratch, so pairing it with introductory tutorials is recommended.
Do I need to install anything to use Exercism?
No. You can use the in-browser editor for all 82 languages. Alternatively, the CLI tool lets you work locally in your preferred editor and submit solutions from the terminal.
Source: exercism.org