Codewars offers community-created coding exercises called kata, with practice across more than 55 programming languages.
Codility
Codility Developer Training offers hands-on programming lessons, including exercises on topics such as binary gaps.
About Codility
Codility Developer Training helps programmers develop coding skills through programming lessons. The site organizes practice into Lessons and Exercises areas and offers a newsletter with information about solutions and lessons online.
Pricing is not clearly stated.
Key features
- Lesson 1 on Iterations
- Readings within lessons
- BinaryGap exercise to find longest sequence of zeros in binary representation of an integer
- Difficulty labels such as easy
Best for: Programmers who want to develop coding skills
Watch out for
- Some parts of the website may not work correctly in unsupported browsers
Codility at a glance
- Website
- app.codility.com/programmers
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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