VeriFast

Spec sheet

Purpose

VeriFast is a research prototype for modular formal verification of C, Rust, and Java programs.Read 11 Oct 2026 · github.com

Support

The maintainer and community can be reached for informal chat in the VeriFast Zulip chatroom.Read 11 Oct 2026 · github.com

License

The source code and binaries are released under the MIT License.Read 11 Oct 2026 · github.com

Headquarters

Leuven, BelgiumRead 28 Sep 2026 · github.com

Documentation status

The VeriFast Docs and Rust reference are described as under construction.Read 11 Oct 2026 · github.com

Downloads

The project provides automatically built nightly binaries and named releases.Read 11 Oct 2026 · github.com

Extension requirement

The VS Code extension requires a separate VeriFast installation and a configured path to its command-line tool.Read 11 Oct 2026 · marketplace.visualstudio.com

Interfaces

The available interfaces are a desktop IDE, a command-line tool, and a Visual Studio Code extension.Read 11 Oct 2026 · github.com

Proofs

Users can write lemma functions as proofs, and VeriFast checks that these functions terminate and have no side effects.Read 11 Oct 2026 · github.com

Rich specifications

Users can define inductive datatypes, primitive recursive pure functions, and abstract separation logic predicates.Read 11 Oct 2026 · github.com

Specifications

Programs can be annotated with preconditions and postconditions written in separation logic.Read 11 Oct 2026 · github.com

Supply chain

The project says its CI workflow creates GitHub Artifact Attestations for binary packages.Read 11 Oct 2026 · github.com

Supported desktop systems

The repository links build instructions for Windows, Linux, and macOS.Read 11 Oct 2026 · github.com

Verification speed

The project says verification time is predictable and low because VeriFast and its SMT solver need little search.Read 11 Oct 2026 · github.com

VS Code integration

The extension can verify the active C, Java, or Rust file and display symbolic execution failures and highlighted source locations.Read 11 Oct 2026 · marketplace.visualstudio.com

Plans and prices

Every VeriFast plan and price →

Where Specifiction places it

• Formal Verification Tools#25 of 357.5