Lemma

Check your work

Any problem, checked

Bring a problem from your own book or homework. Type it or snap it, add your solution, and Lemma checks the reasoning and shows the first step that breaks.

1 · The problem

2 · Your solution

Check your full solution

Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.

Your first check today doesn't need an account.

Your photos and PDFs are read once and not stored — only the transcription is kept.