dafny-lang/dafny

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

3516 stars · 326 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Dafny is a verification-aware programming language with native support for writing specifications and a built-in static verifier powered by SMT solving (Z3). It compiles verified code to C#, Go, Python, Java, or JavaScript and ships with IDE plugins, a language server, and a formatter.

Use cases

• write provably correct code against formal specifications
• verify algorithms with pre/postconditions and loop invariants
• teach formal methods and program verification in courses
• catch specification violations before runtime instead of relying on tests
• compile verified code to C#, Java, Go, Python, or JavaScript
• construct mathematical proofs about software with lemmas and calculational proofs

When to choose

• you need high assurance that code meets its specifications
• you are teaching or learning formal verification
• you are building safety- or correctness-critical algorithms
• you want verification integrated into your editor as you type

When to avoid

• you need a general-purpose language with a large ecosystem and libraries
• your team has no experience with formal specifications
• you need fast iteration without verification overhead
• you target platforms outside the supported compilation backends

Facets

cli-tool · maturity active

programming-language compiler interpreter type-system developer-tools programming-languages compilers developer-tools education windows cross-platform cli editor-plugin dotnet formal-verification static-verification smt-solver z3 specification-language proof-assistant transpilation lsp programming-language algorithms macos linux

Member repositories

For agents

markdown · JSON · MCP: product_card(name="dafny-lang/dafny")