Agda review
A focused open-source environment for dependent types, formal proofs, and verified programs.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Agda combines a dependently typed programming language with an interactive theorem prover. It is aimed at researchers, educators, and developers working with formalized mathematics, verified programs, constructive proofs, and type theory. Its deductive verification method uses theorem proving in Agda, with local type checking and an Emacs interactive editing mode for an interactive development workflow. Agda runs on Windows, macOS, and Linux, and is distributed as open-source software.
The platform fit is practical for projects that need executable results alongside formal verification. Agda programs can compile to GHC Haskell or JavaScript, giving teams two stated targets for integrating verified code into broader software work. Reflection and metaprogramming, rewrite rules, and automatic proof search extend the language beyond basic type checking. Cubical Type Theory support adds another formalism for users whose work requires that approach. Deployment is self-hosted, so the development environment remains local rather than being provided as a hosted service.
Agda’s depth is concentrated in dependent types and proof-oriented programming. Termination checking and coverage checking address important properties of recursive definitions and pattern matching, while interactive theorem proving supports constructive mathematical proofs. This makes Agda a strong fit for users who want programming and proofs in one language and who are comfortable with type theory. It is less suitable for teams seeking a general-purpose verification service, a hosted deployment model, or AI-assisted features. Choose Agda for dependent-type programming and formalized proofs; consider an alternative when broader verification workflows or different input languages are the priority.
Agda pros and cons
- Where it wins
- Dependent type checking with interactive theorem proving
- Termination, coverage, rewrite, and automatic proof checking
- Compiles Agda programs to GHC Haskell and JavaScript
- Where it doesn't
- Self-hosted deployment places environment setup on the user
- Formal work is centered on the Agda language and toolchain
- No AI-assisted features are included
Agda fact sheet, pricing and score →
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