Side by side
AtCoder vs CodingBat
Both stand on coding challenge platforms. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
AtCoder combines free contests with a substantial practice archive and frequent events. Its rating-linked job applications and skills test add career-oriented options alongside programming practice.
Visit AtCoder Free plan Web
CodingBat offers a straightforward way to practice Java and Python without installing software. An account is useful for saving work and tracking progress; without one, inactive sessions eventually lose their work.
Visit CodingBatThe facts
| AtCoder | CodingBat | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | atcoder.jp | codingbat.com |
| On coding challenge platforms | #8 of 30 | #12 of 30 |
AtCoder: what it does well
- Free contest participation.
- Browser-based source-code execution.
- About 5,000 past problems with explanations.
- Supports a wide range of programming languages.
- Weekly beginner contests and regular events.
What to know first
- Available on web only.
- Terms limit each member to one account.
- Contest rating changes require real-time participation.
CodingBat: what it does well
- Free Java and Python practice in a browser.
- Code runs and returns results immediately.
- Accounts track completed problems and progress.
- Users can author custom Java or Python problems.
- Warmup sections all have solution code.
What to know first
- Unauthenticated work is forgotten after inactivity.
- Some problems provide no hints or solution code.
- Available only on the web.
Alternatives to AtCoder Alternatives to CodingBat The whole list