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Dafny vs Idris: catalog facts
Dafny	Idris
Best for: Developers who need formally verified code for critical logic	Best for: Programmers exploring dependent types and verified functional programming
Free Free and open source under the MIT licence.	Free Free and open source under the BSD 3-Clause licence.
Windows, Command line	Windows, Command line
Automated verification of code against specifications Compiles to C#, Java, JavaScript and Go All 4 strengths for Dafny Automated verification of code against specifications Compiles to C#, Java, JavaScript and Go Language server, formatter and IDE plugins included Extensive tutorials and reference manual	Types are first-class and can describe precise program properties Compiler can check assumptions and proofs before the program runs All 3 strengths for Idris Types are first-class and can describe precise program properties Compiler can check assumptions and proofs before the program runs Language server and community tooling available
Writing specifications takes extra effort and a learning curve Python compilation still in progress	Small ecosystem compared with mainstream languages Dependent types have a steep learning curve
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-3-Clause
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Dafny dafny-lang.github.io/dafny Catalog checked October 2, 2026	Official website Full listing and sources Sources for Idris idris-lang.org Catalog checked October 2, 2026

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