Agda
Agda: A focused open-source environment for dependent types, formal proofs, and verified programs. Ranked #29 of 35 in Formal Verification Tools by our editors (6.6/10); pricing: Open source; best for dependent-type programming and proofs.
At a glance
- Editor score6.6 / 10
- PricingOpen source
- Best forDependent-type programming and proofs
- Paid fromFree
- Verification methodDeductive
- Facts checked20 Sep 2026
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
Our verdict on Agda
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.
Your product? Our editors can test Agda in depth and publish a review, labelled as paid · from $149/mo →
Agda pricing
Agda fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Verification method | Deductive |
| Supported formalisms | Theorem-proving |
| Counterexamples | Not verified |
| Proof artifacts | Not verified |
| Input languages | Agda |
| Deployment | Self-hosted |
| Deployment | Self-hosted |
| Platforms | Windows, macOS, Linux |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Open source |
| Website | wiki.portal.chalmers.se |
| Facts checked | 20 Sep 2026 |
Alternatives to Agda
- IsabelleA free, open-source proof assistant for broad mathematical and systems verification.9.4
- RocqA free, kernel-checked theorem prover with dependent types, automation, and certified extraction.9.3
- PVSA broad, self-hosted environment for hybrid formal verification workflows.9.2
Used Agda? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Agda for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Agda is listed in our Formal Verification Tools directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/agda/"><img src="https://www.itechguides.com/best/badge/agda.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update