Terms of use

ytyk.org is free to use, for any purpose, without an account. You may use it at work, in a class, or to settle an argument. There is no rate limit and nothing to agree to beyond this page.

Please do not try to break it for other people — automated scraping heavy enough to affect availability, or attempts to interfere with the hosting, are the only uses that are not welcome. Everything the site does happens in your own browser, so there is very little here to abuse.

The sandboxes execute your code inside your own browser — CPython compiled to WebAssembly, a Worker, or SQLite compiled to WebAssembly, depending on the course. Nothing you type is uploaded, and nothing runs on a server we control. It is your browser doing the work, subject to your browser's own limits, and a runaway loop costs you a tab rather than anything shared.

Every snippet on this site is executed against a real implementation before it ships, and the build fails if an answer key and the engine disagree. That is a strong guarantee and it is worth stating precisely: it means each answer was true for the version that ran it in CI. Languages change. An answer can go stale, an explanation can be wrong about why even when the output is right, and a comparison note about another language is prose that nothing verifies.

So: the site is offered as it is, with no warranty of any kind. Do not use it as the sole basis for a decision that matters, and if you find something wrong, please say so — corrections are the most useful thing anyone sends.

The questions, explanations and comparison notes are written for this site and are its author's work. You are welcome to quote them with attribution and a link, to use them in a talk or a study group, and to link to any page here. Republishing the content wholesale, or feeding it into a product that presents it as its own, is not permitted without asking first.

The code snippets themselves are short, factual demonstrations of language behaviour and are not claimed as anyone's property — use them freely. Language names and logos belong to their respective owners; this site is not affiliated with, endorsed by, or connected to any of them.

The site is a hobby project on free hosting. It may be unavailable, may change without notice, and may one day stop being updated. Your progress lives in your own browser, so nothing you have done depends on the site staying up — which is also why none of it can be recovered if you clear it.

Questions, corrections and complaints: [email protected]. See also the privacy notice.