Dafny
5.7#26 in formal verification toolsLinuxmacOSSelf-hostedWindows
VisitDafny vs Why3
What both publish
| Fact | Dafny | Why3 |
|---|---|---|
| License | The Dafny software is licensed under the MIT License. | TryWhy3 is distributed under the GNU Lesser General Public License version 2.1 with a special linking exception. |
| Purpose | It helps developers write code that can be verified against specifications to reduce the risk of late-stage bugs. | Why3 is a platform for deductive program verification that uses WhyML and external theorem provers to discharge verification conditions. |
| Support | The project directs users to its Zulip channel for questions and GitHub for issue reports. | The project provides a user mailing list, a Zulip chat, and a bug tracking system. |
Dafny plans
No prices published.
Why3 plans
- Why3Free
Pick Dafny if…
Dafny may suit developers who want to verify code against explicit specifications, as well as people using it for teaching or research. It also supports industrial use and offers Visual Studio Code and Emacs guidance.
Pick Why3 if…
Why3 suits developers and researchers working on deductive verification with contracts and WhyML. It may also fit users who need to connect external provers or use its OCaml API.