Hey everyone,

I've been preparing for frontend interviews and couldn't find a quiz tool I liked, so I built one: devsets.com

What's inside:

• 2,700+ questions across 12 topics (JavaScript, TypeScript, React, Next.js, Angular, Vue, Svelte, HTML & CSS, state management, testing, patterns, system design)
• Junior / Middle / Senior levels, and every answer comes with an explanation and links to the docs
• Interview mode with a timer per question
• Stack quizzes (e.g. "React Developer") that mix several topics like a real interview
• Spaced repetition: questions you got wrong come back after 1, 3 and 7 days
• 18 JavaScript coding tasks (debounce, deepClone, Promise.all...) with tests that run in the browser

It's free, ad-free and works without an account (sign in only if you want to sync progress). Available in English, Ukrainian and Polish.

I'd really appreciate feedback: wrong answers, confusing questions, missing topics, anything. Every question has a "report a problem" button too.