CodingBat
CodingBat is a free website for practicing Java and Python through live coding problems.
What CodingBat is
CodingBat is a free website for practicing Java and Python through live coding problems. Users enter code in a browser text area and select Go to save, compile, run it, and view results immediately; there is nothing to install. Problems become more difficult toward the end of each section, and some offer hints or solution code. Every Warmup section has solution code available. The exercises are intended for homework, self-study, labs, and live lecture examples. An account can save code and completion checkmarks, show finished problems, and provide progress graphs and code badges. Accounts can also 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 create custom pages and author Java or Python problems. CodingBat says it uses cookies for login sessions and does not use third-party cookies; it also says it does not send marketing email, sell contact information for marketing, or publicly identify users.
Good
- Free browser-based practice; nothing to install.
- Problems cover Java and Python.
- Some problems include hints or solution code.
- Accounts provide completion lists, graphs, and badges.
- Users can create custom pages and coding problems.
Watch out
- Unauthenticated work is forgotten after two inactive hours.
- Some problems do not have hints or solutions.
Who it suits
CodingBat suits learners who want browser-based practice in Java or Python, whether for self-study, homework, labs, or lectures. Teachers may also find its account-sharing and student completion reports useful.
Verdict
CodingBat offers direct practice in Java and Python with immediate results and optional progress tracking. Create an account to save work and share completion information with a teacher; otherwise, inactive-session work is not retained.
Plans and prices
From CodingBat's own pricing page, checked 1 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Java and Python coding problems · browser-based practice · account optional |
The facts
Each one read from CodingBat's own pages, with the date it was checked.
What it does
- Accounts
- Accounts save code and checkmarks, while unauthenticated work is forgotten after a session ends following two hours without activity.checked 1 Oct 2026
- Cookies
- CodingBat uses cookies to maintain login sessions and says it does not use third-party cookies.checked 1 Oct 2026
- Custom content
- Users can create custom pages and custom Java or Python problems with CodingBat's authoring feature.checked 1 Oct 2026
- Data use
- CodingBat collects regular web-server logs and may use submitted code and data for research into teaching technology.checked 1 Oct 2026
- Feedback
- Users type code into a browser text area and click Go to save, compile, run, and see results immediately.checked 1 Oct 2026
- Hints and solutions
- Some problems provide hints or solution code, and all Warmup sections have solution code available.checked 1 Oct 2026
- Installation
- The site is designed with nothing to install and works in the browser.checked 1 Oct 2026
- Privacy
- CodingBat says it does not send marketing email, sell contact information for marketing, or publicly identify users.checked 1 Oct 2026
- Problem progression
- Problems in each section become harder toward the end of the section.checked 1 Oct 2026
- Progress tracking
- Each account has a done page listing completed problems, and CodingBat provides progress graphs and code badges.checked 1 Oct 2026
- Purpose
- CodingBat is a free site of live coding problems for building Java and Python coding skill.checked 1 Oct 2026
- Support
- The site asks users to email [email protected] with bug reports or suggestions.checked 1 Oct 2026
- Teacher sharing
- Accounts can share information with a teacher account, whose report lists students and their completed-problem counts.checked 1 Oct 2026
- Use cases
- CodingBat says its problems work for homework, self-study, labs, and live lecture examples.checked 1 Oct 2026
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