metalean
Verified Lean typechecker
Details
- External ID
- 1375502793
- Source
- GITHUB
- Company
- —
- Product
- metalean
- Website domain
- github.com
- Launched
- Sept. 18, 2026
- Cohort
- —
- Upvotes
- 11
- Upvotes percentile
- 0.33858570330514987
- Tags
- —
- Fetched at
- Sept. 22, 2026, 5:03 p.m.
- Updated at
- Sept. 22, 2026, 5:03 p.m.
Enrichment
- Theme
- decision model runtimes and tools
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- verified typechecker for lean
- Manually corrected
- False
Could you build this?
No Writing a formally verified typechecker for the Lean theorem prover requires deep theoretical computer science, type theory, and formal proof verification expertise.
What it would actually take: A verified typechecker is implemented in a proof assistant like Lean or Coq, formally proving sound and terminating type inference and kernel reduction rules against the calculus of inductive constructions. It requires advanced academic expertise in dependent type theory and formal verification techniques that LLMs frequently hallucinate on.
Competitors
Other products that read as similar to this one — 524 launches clear the similarity bar, closest 8 shown.
Attention rank: #320 of 525 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 322 days after the earliest competitor.
- ConZF · github · 2026-09-18 · 17 upvotes · similarity 0.59
- Verified Deep Learning with Lean 4 · hn · 2026-04-21 · 6 upvotes · similarity 0.58
- genpark-type-checker-hindley-milner-skill · github · 2026-09-28 · 7 upvotes · similarity 0.55
- Algebruh · hn · 2026-08-08 · 14 upvotes · similarity 0.55
- Viveka: filter LLM output against a Lean-verified Advaita Vedanta model · hn · 2026-06-02 · 7 upvotes · similarity 0.54
- hermes-nerve · github · 2026-09-18 · 13 upvotes · similarity 0.54
- awesome-jev-typesafe · github · 2026-09-18 · 129 upvotes · similarity 0.52
- VeriTile · github · 2026-09-24 · 24 upvotes · similarity 0.51
Other launches for this product
- No other launches for this product.
Same idea, different domain
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