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Daily Coding publishes one programming challenge every day. Everyone gets the same challenge, and it stays up for 24 hours, the idea is borrowed from Advent of Code, but it runs all year instead of twelve days in December.
You write your solution in the browser and run it against the test cases in one of 11 languages: JavaScript, TypeScript, Python, PHP, Ruby, Java, Go, C++, C#, Rust and Swift. Code is executed in a sandbox on the server, and results usually come back in well under a second. Once you submit, you can read every other solution to the same challenge.
What it is not: a course, a curriculum or an interview-prep grind with thousands of problems. There is exactly one challenge, and it is the same one everybody else is solving today.
Listed in
Daily challenge
One challenge per day, identical for every user, live for 24 hours
Languages
11: JavaScript, TypeScript, Python, PHP, Ruby, Java, Go, C++, C#, Rust, Swift
In-browser editor
Monaco editor with test runs before you submit
Sandboxed execution
Code runs server-side in an isolated sandbox, results in under a second
Shared solutions
Every other solution becomes readable once you submit your own
Streaks and leaderboard
Optional, requires a free account
No account required
Today's challenge can be solved without signing up
Open Source and Free
MIT licence, including the sandbox setup
One challenge per day, and it is the same challenge for everyone. There is no catalogue to browse and nothing to pick, that decision is exactly what makes most people quit after a week. Once you submit, every other solution to the same challenge becomes readable, across all 11 languages.
Because it takes choice away instead of adding more. LeetCode and Codewars offer thousands of problems; Daily Coding offers the one that is live today. It is free with no paid tier, today's challenge works without an account, and the whole thing is open source under MIT, including the sandbox that runs the code.
Developers who want a small daily habit rather than interview grinding: people who enjoy Advent of Code and miss it in January, students and apprentices practising algorithms, and experienced developers warming up in a language they are currently learning.
I do Advent of Code every December and try to keep the habit going on LeetCode every January. It never lasted more than a week, too many problems, no reason to do this one today. So I built what I actually wanted: one challenge, the same for everybody, all year round. Seven months of evenings and about 470 commits later, it runs in 11 languages.
Next.js 16 and TypeScript with the Monaco editor, deployed on Vercel. Submissions are executed on a self-hosted Piston instance on a Hetzner server, with typed test harnesses generated per language. Prisma for data access, Postgres DB
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