Get dafny on macOS and Linux Now!
Dafny is a verification-aware programming language
Get dafny with one command
Pick your system, reveal the step-by-step guide, copy the command, paste it into your terminal and press Enter. This command comes from the project's public source.
Not available for Windows yet.
dafny doesn't publish an install command for Windows anywhere we can verify, so there's nothing for us to show you. We won't invent one. It does document one for macOS and Linux — switch to that tab.
Pastes into PowerShell and installs dafny on your Windows machine in one step. Runs as your normal user account, and needs no administrator rights.
Not available for macOS yet.
dafny doesn't publish an install command for macOS or Linux anywhere we can verify, so there's nothing for us to show you. We won't invent one.
Installs dafny on your macOS or Linux machine and links it into your PATH — after this,
dafny just works from any directory. Runs as your normal user account, and needs no administrator rights.
How to set up dafny, step by step
Open Terminal. On a Mac it's in Applications ▸ Utilities, or press Cmd+Space and type Terminal. On Linux, press Ctrl+Alt+T. Paste the command and press Enter.
Run dafny --help to see the available commands, and
dafny --version to confirm the install worked. If your shell complains about
permissions, that project usually documents a corrected command on its own site.
This asks Homebrew to fetch dafny and link it into /opt/homebrew/bin (Apple Silicon) or /usr/local/bin (Intel), so you can run it by name.
What dafny does
- Lecture 0: Pre- and postconditions (19:08)
- New overview article: Accessible Software Verification with Dafny, IEEE Software, Nov/Dec 2017
- Dafny libraries, a standard library of useful Dafny functions and lemmas
- CLU (like its iterators, and inspiration for the out-parameter syntax)
- Java, C#, and Scala (like the classes and traits, and syntax for functions)
- Coq and VeriFast (like the ability to include co-inductive datatypes and being able to write inductive and co-inductive proofs)
Summarised from dafny's own documentation.
About dafny
Dafny is a verification-aware programming language
| Category | Developer tool |
|---|---|
| Install method | Homebrew |
| Windows | no install command published |
| macOS / Linux | documented install command available |
| Price | Free and open source |
| Command verified | From project source |
| Popularity | 3.6k stars on the project's public repository |
On mobile
dafny is a command-line tool, so there is no phone app for it — a phone has no shell to run it in. You'll need a desktop, or a remote shell into a machine that has one.
dafny is developed by its own authors. This page is an independent reference; we are not affiliated with or sponsored by the project. The command shown here was reproduced from the project's public documentation — always check the project's own documentation before running anything.