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Idris vs Dafny: catalog facts
Idris	Dafny
Free Free and open source under the BSD 3-Clause licence.	Free Free and open source under the MIT licence.
Windows, Command line	Windows, Command line
Types are first-class and can describe precise program properties Compiler can check assumptions and proofs before the program runs	Automated verification of code against specifications Compiles to C#, Java, JavaScript and Go
Small ecosystem compared with mainstream languages Dependent types have a steep learning curve	Writing specifications takes extra effort and a learning curve Python compilation still in progress
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.