AtCoder vs Kattis
AtCoder
atcoder.jp
Kattis
kattis.comSide by side
| Figure | AtCoder | Kattis |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | — | Yes |
| Plans published | 1 | 0 |
| Spec score · Coding Challenge Platforms | 8.1 (#8) | 7.1 (#25) |
| Account limit | The terms allow one account per member and prohibit transferring, lending, or sharing an account. | Personal accounts are individual and may not be shared; Kattis says each person may have only one personal account. |
| Headquarters | Tokyo, Japan | Stockholm, Sweden |
Plans
In their own words
AtCoder
AtCoder is a free web service for competitive programming contests and practice. Users solve programming problems in Algorithm Contest and Heuristic Contest formats, and can run source code in a browser rather than setting up a local programming environment. Its practice library contains about 5,000 past problems with explanations, and it supports nearly all major programming languages, including C++, Python, Rust, Java, and C#. Beginner Contests take place weekly, Regular Contests about monthly, Grand Contests five to six times a year, and heuristic contests about monthly. Real-time participation in Algorithm or Heuristic contests changes a user's AtCoder rating. AtCoder Jobs lets users apply to companies using their rating for roles including internships and experienced positions. PAST is an online algorithm skills test available in Japanese and English, with problems updated every six months. AtCoder says it has about 200,000 registered users and about 10,000 participants in real-time contests weekly. Its terms limit members to one account and prohibit account sharing, lending, or transfer.