Codeforces vs CSSBattle
Codeforces
codeforces.comCSSBattle
cssbattle.devSide by side
| Figure | Codeforces | CSSBattle |
|---|---|---|
| Price from | Free | $4.90/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | — |
| Plans published | 1 | 5 |
| Spec score · Coding Challenge Platforms | 7.8 (#15) | 8.1 (#10) |
| Security | The privacy policy says the data controller takes appropriate security measures to prevent unauthorized access, disclosure, modification, or destruction of data. | The privacy page says the website works strictly over HTTPS and submissions are inaccessible to other players except on Open Targets or Daily Targets. |
Plans
CSSBattle
- CSSBattle FreeFree
- CSSBattle PLUS Monthly$4.90 a month
- CSS Learn Basic$13, paid once
- CSSBattle PLUS Yearly$59 a year
- CSS Learn Intermediate$100, paid once
In their own words
Codeforces
Codeforces is a programming-contest community and platform where regular contests give participants a way to solve problems and earn skill ratings. The site says it organizes approximately six contests each month, with free participation open to everybody. In contests following Codeforces rules, participants gain points for solving problems quickly and can test other contestants’ solutions through hacks. Ratings use a modified Elo system, and contestants are split into two divisions. The online judge checks submissions against prepared tests and tests suggested through hacks, then returns a verdict. Past contests are available for practice, while the site says learning content and training features are in development. Codeforces also offers an API that returns some data as machine-readable JSON over HTTP. Public data can be requested anonymously; private user data requires an API key. API requests are limited to one every two seconds, and faster calls receive a call-limit error. The service is free and available on web and through an API.
CSSBattle
CSSBattle is a web game for practicing HTML and CSS by rebuilding target images with the shortest possible code. Scores reflect both visual similarity and character count. You can open targets and write code without an account, but logging in is required to submit and receive a score. A new Daily Target appears at 00:00 UTC; these daily challenges have no leaderboards. Battles use separate targets and leaderboards, while private Versus battles support one-on-one challenges with friends. Submissions cannot use JavaScript, SVG, images, or external assets, and are rendered in a headless Chromium browser on Ubuntu 18.04. Learn courses add interactive levels and quizzes for beginners, intermediate learners, and experts. The free plan permits only the current day’s target. PLUS adds more than 1,100 past Daily Targets, top solutions, plugins, statistics, search and sharing, unlimited history, and a VSCode editor. CSSBattle Free costs nothing; PLUS costs $4.90 a month or $59 a year.