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CSSBattle vs Project Euler

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.

CSSBattle

Free plan Web

CSSBattle turns concise HTML and CSS practice into target-based challenges, with courses and multiplayer options alongside daily play. The free plan is limited to the current Daily Target; PLUS adds past targets and other tools.

Visit CSSBattle

Project Euler

Free plan Web

Pick Project Euler if you want a free web collection of mathematics and programming exercises, with progress tracking and closed groups. Look elsewhere if you need account recovery after losing a password or want progress hidden from friends and group members.

Visit Project Euler

The facts

CSSBattleProject Euler
Free planYesYes
Open sourceNot publishedNot published
Runs onWebWeb
Lowest paid planCSSBattle PLUS Monthly: $4.90 a monthFree or on request
Plans published51
MakerNot publishedNot published
Websitecssbattle.devprojecteuler.net
On coding challenge platforms#14 of 30#18 of 30

CSSBattle: what it does well

  • Scoring considers visual match and code character count.
  • Private one-on-one Versus battles are available.
  • Learn courses include interactive levels and quizzes.
  • PLUS unlocks more than 1,100 past Daily Targets.

What to know first

  • Free play is limited to the current day's Daily Target.
  • Logging in is required to submit and receive a score.
  • Submissions cannot use JavaScript, SVG, images, or external assets.

Project Euler: what it does well

  • Free registration supports progress tracking.
  • Archive lists problems 1 through 1003.
  • News page publishes upcoming problem release dates and times.
  • Closed groups provide ranked progress and solve-time tables.
  • Accounts do not require real names, email addresses, or IP addresses.

What to know first

  • Tracking progress requires an account and cookies enabled.
  • Lost passwords cannot be recovered by the site.
  • Friends and group members can see progress pages despite a hidden public profile.

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