Lemma
Lemma checks your proof like a careful TA
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It finds the first line that doesn't follow, and it won't hand you the answer.
PH · launched Nov 14, 2026 · 1 upvote (top 65%) · 0 views
Niche: identity and formal verification software · 93 launches, 5 in the last 7 days ▼ -38% · Explore this niche →
Category and tags
- Education
- Agent / copilot
- B2C
- AI-native
- Commercial product
- Education
- Science
Visit website ↗ Source listing ↗
More like this: all 93 launches in identity and formal verification software →
Could you build this?
Partial The UI for uploading and annotating proofs is simple, but reliably identifying the first invalid step in an arbitrary proof is a hard reasoning problem that an LLM alone will get wrong often enough to undermine the product.
What it would actually take: A credible version would formalize proofs into a checker such as Lean or Coq, or use a structured step-by-step verifier with symbolic checks where possible. The hard parts are autoformalization of natural-language proofs and calibrating feedback so it does not give away answers. This needs mathematicians or formal-methods experts and a curated evaluation set of graded proofs.
Competitors
Other products that read as similar to this one : 60 launches clear the similarity bar, closest 8 shown.
Attention rank: #27 of 61 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 312 days after the earliest competitor.
- first-pass · github · 2026-09-25 · 116 upvotes · similarity 0.39
- prove-it-better · github · 2026-10-03 · 13 upvotes · similarity 0.38
- Lemmafit: Make agents prove that their code is correct · hn · 2026-03-08 · 7 upvotes · similarity 0.38
- LemmaScript, a verification toolchain for TypeScript via Dafny · hn · 2026-04-21 · 5 upvotes · similarity 0.38
- Punchcard in Excel: Verify agent work like a formula · yc · 2026-11-04 · 3 upvotes · similarity 0.36
- memecoin-claude · github · 2026-09-25 · 9 upvotes · similarity 0.35
- diophantine-z-q · github · 2026-11-04 · 59 upvotes · similarity 0.35
- Chromata - Code Breaker Puzzle · ph · 2026-11-01 · 1 upvotes · similarity 0.35
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