LeanCIL
LeanCIL is a Lean 4 formal verification framework for .NET programs. It enables machine-checked proofs of correctness and safety against compiled Common Intermediate Language (CIL), supporting applications written in C#, F#, and other .NET languages.
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GITHUB · launched Oct 14, 2026 · 49 upvotes (top 34%)
- Horizontal
- Dev tools
- Developer
- Not AI
- Hobby / open-source project
Similar launches
See all 72 similar launches →Could you build this?
No Building a formal verification framework in Lean 4 requires advanced mathematical logic, type theory, and formal semantics of .NET intermediate language.
What it would actually take: Building LeanCIL requires formalizing the full CIL instruction set and virtual execution system within Lean 4's dependent type theory. It also requires developing a verified parser and AST generator to ingest compiled .NET assemblies into Lean definitions, along with proof automation tactics for memory safety and program correctness. This requires specialized academic expertise in interactive theorem provers, compiler design, and formal methods.
Competitors
Other products that read as similar to this one : 72 launches clear the similarity bar, closest 8 shown.
Attention rank: #35 of 73 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 331 days after the earliest competitor.
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- metalean · github · 2026-09-18 · 11 upvotes · similarity 0.46
- Talos · hn · 2026-06-18 · 106 upvotes · similarity 0.45
- Lasm · hn · 2026-10-30 · 36 upvotes · similarity 0.44
- h5i · ph · 2026-10-24 · 1 upvotes · similarity 0.42
- spivak-lean · github · 2026-09-26 · 42 upvotes · similarity 0.41
- Spivak's Calculus formalized in Lean 4 · hn · 2026-09-26 · 22 upvotes · similarity 0.41
- LemmaScript, a verification toolchain for TypeScript via Dafny · hn · 2026-04-21 · 5 upvotes · similarity 0.41
Other launches for this product
- No other launches for this product.