21-Day Coding Challenge

What it does

Conquer daily JavaScript challenges to skill-up on your coding abilities. Code on your own, or on a team, and be eligible to win more than $10,000 in prizes.

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  1Code1Day2025 · 1code1day.app · ▲16

  A daily code challenge

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  100 Days of Code2018 · 100daysofcode.com · ▲306

  Make coding a habit. Join the growing community.

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  24 days of #JavaScriptmas 🎄2020 · scrimba.com · ▲24

  📅 Coding advent calendar with daily challenges and prizes

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  100DaysOfNoCode Challenge2021 · 100school.com · ▲566

  Learn to no-code in 100 days

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  A Repo of JavaScript Coding Challenges2015 · github.com · ▲127

  Some basic javascript coding challenges and interview questions - kolodny/exercises

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  JavaScript Learning Roadmap2025 · java-script-learning-roadmap.vercel.app · ▲13

  Master JavaScript in 30 Days—One Project at a Time!

• 
  SimCity, but with Permits▲939

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 8d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 20d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 21d ago · bigwords.page

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  Steal My Bitcoin▲619

  A PHP security challenge. Find the hidden bitcoin key. First person to get the wallet wins.

  Life & fun · 3d ago · stealmybitcoin.com

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 15d ago · guitoro.com

• 
  Product Hunt Visual Launch Editor▲446

  See your launch as you build it

  Life & fun · 5d ago

• 
  Bel▲1,288

  Life & fun · 2019 · paulgraham.com

• 
  Vector Illustration Creator▲811

  Create free personalized illustrations from 3000+ elements

  Growth · 2019 · icons8.com

• 
  Open Doodles▲687

  A collection of free sketchy illustrations

  Growth · 2019 · opendoodles.com

• 
  AirPods Pro▲576

  New AirPods with active noise cancellation

  Life & fun · 2019 · apple.com

• 
  The New Ember Mugs▲568

  The next generation of temperature controlled mugs

  Life & fun · 2019 · ember.com

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  Lazy IoT▲533

  Control your environment with one easy keyboard shortcut

  Work · 2019 · lazy-app.com