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CodingBat
What it is
CodingBat is a free browser-based site for practicing Java and Python with live coding problems. Enter code in a browser text area and select Go to save, compile, run it, and see the result. Nothing needs to be installed. Problems become harder toward the end of each section, and some offer hints or solution code; every Warmup section has solutions available. The exercises are intended for homework, self-study, labs, and lecture examples. An account saves code and completion checkmarks, provides a completed-problems page, and includes progress graphs and code badges. Accounts can share information with a teacher account, whose report lists students and their completed-problem counts. Without an account, work is forgotten after a session ends following two hours without activity. Users can also create custom pages and author Java or Python problems. CodingBat says it does not send marketing email, sell contact information for marketing, or publicly identify users. Its cookies maintain login sessions, and it says it does not use third-party cookies.
For and against
For
- Free browser-based Java and Python practice
- No installation required
- Accounts save code and completion checkmarks
- Users can author custom problems
Against
- Unauthenticated work is forgotten after two inactive hours
- Some problems provide hints or solutions, not all
The verdict
CodingBat offers a direct way to run Java and Python practice problems in a browser. An account is useful for retaining work and tracking completion.
Who it suits
CodingBat suits people practicing Java or Python for self-study, homework, labs, or lecture examples. Teachers may use shared account information and student completion reports.
Plans and prices
Free
Java and Python coding problems · browser-based practice · account optional
Read 1 Oct 2026 · codingbat.com
On the record
- Accounts
- Accounts save code and checkmarks, while unauthenticated work is forgotten after a session ends following two hours without activity.codingbat.com · read 1 Oct 2026
- Cookies
- CodingBat uses cookies to maintain login sessions and says it does not use third-party cookies.codingbat.com · read 1 Oct 2026
- Custom content
- Users can create custom pages and custom Java or Python problems with CodingBat's authoring feature.codingbat.com · read 1 Oct 2026
- Data use
- CodingBat collects regular web-server logs and may use submitted code and data for research into teaching technology.codingbat.com · read 1 Oct 2026
- Feedback
- Users type code into a browser text area and click Go to save, compile, run, and see results immediately.codingbat.com · read 1 Oct 2026
- Hints and solutions
- Some problems provide hints or solution code, and all Warmup sections have solution code available.codingbat.com · read 1 Oct 2026
- Installation
- The site is designed with nothing to install and works in the browser.codingbat.com · read 1 Oct 2026
- Privacy
- CodingBat says it does not send marketing email, sell contact information for marketing, or publicly identify users.codingbat.com · read 1 Oct 2026
- Problem progression
- Problems in each section become harder toward the end of the section.codingbat.com · read 1 Oct 2026
- Progress tracking
- Each account has a done page listing completed problems, and CodingBat provides progress graphs and code badges.codingbat.com · read 1 Oct 2026
- Purpose
- CodingBat is a free site of live coding problems for building Java and Python coding skill.codingbat.com · read 1 Oct 2026
- Support
- The site asks users to email [email protected] with bug reports or suggestions.codingbat.com · read 1 Oct 2026
- Teacher sharing
- Accounts can share information with a teacher account, whose report lists students and their completed-problem counts.codingbat.com · read 1 Oct 2026
- Use cases
- CodingBat says its problems work for homework, self-study, labs, and live lecture examples.codingbat.com · read 1 Oct 2026
