Toph hosts competitive programming contests and problems on algorithms and data structures, with a community for participants.
Kattis
vsAtCoder
Kattis vs AtCoder
How do Kattis and AtCoder compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | Kattis | AtCoder |
|---|---|---|
| What it is | Kattis provides a problem archive for users to practice programming challenges. | 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 Kattis and AtCoder.
CodeAbbey offers programming problems for practice, with recent challenges and a programming certificate.
EMKC offers practical coding challenges and contests that can be completed in any of 17 programming languages.
NeetCode offers coding interview practice through courses, assessments, head-to-head mode, and a catalog of programming problems.
Codewars offers community-created coding exercises called kata, with practice across more than 55 programming languages.
30 Seconds of Code offers hundreds of short coding articles to help readers practice programming skills.