Codewars offers community-created coding exercises called kata, with practice across more than 55 programming languages.
30 Seconds of Code
vsAtCoder
30 Seconds of Code vs AtCoder
How do 30 Seconds of Code and AtCoder compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | 30 Seconds of Code | AtCoder |
|---|---|---|
| What it is | 30 Seconds of Code offers hundreds of short coding articles to help readers practice programming skills. | AtCoder hosts online programming contests, including beginner and heuristic contests, with practice contests for new users. |
| Website | ||
| Type | Website | Website |
| Topic | ||
| Pricing | Not confirmed | Not confirmed |
| Platforms | Web | Web |
| Open source | Not stated | Not stated |
| Language | English | — |
| Alternatives |
Other options to consider
Sites similar to both 30 Seconds of Code and AtCoder.
CodeAbbey offers programming problems for practice, with recent challenges and a programming certificate.
NeetCode offers coding interview practice through courses, assessments, head-to-head mode, and a catalog of programming problems.
EMKC offers practical coding challenges and contests that can be completed in any of 17 programming languages.
Exercism offers practice and mentoring across 83 programming languages.
Free
24 alternatives
Rosetta Code presents solutions to the same programming tasks in multiple languages for comparison.