Skip to content
Stay Practiced.

Learn to code. Stay practiced.

Learn the basics, build working programs, or refresh the skills your daily work leaves rusty. Practice one task at a time, with feedback on each attempt.

Try the free Daily Challenge

No account needed. Tests run in your browser.

Free account for full JavaScript practice. No payment card needed.

Refresh the basics

Variables, loops, functions, and collections. Small questions that build up to working code.

Write and debug

From simple functions to retry-safe commands and bounded concurrency. Run tests and improve with useful feedback.

Train for interviews

Short algorithm problems, organized by patterns and prerequisites in the Gym.

The daily JavaScript challenge with its task, editable starter code, tests and Run tests action.
An actual daily challenge, with editable code and inspectable tests.

Practice by debugging.

Change the JavaScript, run the tests, and inspect the failing case. A new challenge every day, with a calendar to revisit earlier ones.

The editor and tests work right here in your browser. No account needed for the daily challenge.

Open the Daily Challenge

See your practice add up.

Follow your answers, coding results and active days. See which topics need another attempt.

Your history grows with your actual work, across questions and coding.

Personal Stats showing tasks solved, checked answers, topic results and practice activity.
A real local practice session: six checked answers and one coding solve.
Stay Practiced desktop JavaScript workspace with code, passing tests and the next review.
The desktop JavaScript workspace. Pro adds offline access to your included subjects.

Offline practice with Pro

Make offline time practice time.

Reclaim your commute. Practice while you fly. Keep working where the connection is unreliable, or where you’d rather not depend on the internet.

Download your included subjects to the local app before you go. Sync your progress when you reconnect.

Explore Pro

Memberships

Choose where you want to practice.

Start with Free JavaScript. Add browser languages with Web, native tools with Plus, or offline practice with Pro.

Billing frequency

JavaScript in your browser

Free

$0

Always free

No payment card needed

JavaScript coding, recall practice and algorithm Gym. Free passkey account.

  • Coding exercises, algorithm Gym and reading practice
  • Tests run in your browser
  • Progress saved on this device

More languages in your browser

Web

$119/year

Billed annually

Save $1.00 versus 12 monthly payments

More browser languages, coding and recall practice, with progress sync. No install.

  • Python, TypeScript, React, Angular, PHP and SQL
  • Coding exercises, algorithm Gym and reading practice
  • Learning progress syncs between browsers

Native languages on your machine

Plus

$249/year

Billed annually

Save $51.00 versus 12 monthly payments

Everything in Web, plus native languages using your compilers and the paired local app.

  • Everything in Web, plus Go, Rust, C, C++, C#, Node and ASP.NET
  • Keep the browser workspace; run native code on your machine
  • Requires the local app and installed language toolchains
  • Optional passkey-approved assistant coaching; your code stays local

Make offline time practice time

Pro

$499/year

Billed annually

Save $89.00 versus 12 monthly payments

Everything in Plus. Download your included subjects, practice offline, and sync when connected. Keep packs released while subscribed.

  • Everything in Plus, with your included subjects downloaded to desktop
  • Practice on commutes, flights, and without reliable internet
  • Keep Practice Packs released while your Pro subscription is active

Checking paid-plan availability. Free practice is ready now.