Agda is a dependently typed functional programming language. It has inductive families, i.e., data types which depend on values, such as the type of vectors of a given length. It also has parametrised modules, mixfix operators, Unicode characters, and an interactive Emacs interface which can assist the programmer in writing the program.

Agda is a proof assistant. It is an interactive system for writing and checking proofs. Agda is based on intuitionistic type theory, a foundational system for constructive mathematics developed by the Swedish logician Per Martin-Löf. It has many similarities with other proof assistants based on dependent types, such as Coq, Epigram, Matita and NuPRL.

Agda is open-source and enjoys contributions from many authors. The center of the Agda development is the Programming Logic group at Chalmers and Gothenburg University. The main developers are Ulf Norell, Nils Anders Danielsson, Jesper Cockx, and Andreas Abel.

Latest releases

• 2024-09-12: Agda 2.7.0.1 (all versions)
• 2024-09-03: Agda Standard Library 2.1.1 (all versions)

Getting started

• Install Agda on your own PC or try out Agda in the browser with the Agda Pad.
• Get your feet wet with A Taste of Agda.
• Read one of the language tutorials.
• Ask any questions on the Agda mailing list or on the Agda Zulip server.

Further information

• Manuals and howtos
• Standard library
• Other libraries and developments
• Bug tracker
• Publications
• History

Agda meetings

• Agda Implementors’ Meeting XXXIX will take place in Gothenburg, Sweden from Monday 25 to Saturday 30 November 2024.
• Agda Implementors’ Meeting XXXVII| took place in Swansea, Wales, UK from Monday 13 to Saturday 18 May 2024.
• Agda Implementors’ Meeting XXXVII took place in Taipei, Taiwan from Monday 20 Nov 2023 to Saturday 25 Nov 2023, co-located with APLAS 2023.
• Agda Implementors’ Meeting XXXVI took place in Delft from Wednesday 10 May 2023 to Tuesday 16 May 2023.
• Past Agda Meetings.