Apalache translates TLA+ into the logic supported by SMT solvers such as Microsoft Z3. Apalache can check inductive invariants (for fixed or bounded parameters) and check safety of bounded executions (bounded model checking). To see the list of supported TLA+ constructs, check the supported features. In general, Apalache runs under the same assumptions as TLC. However, Apalache benefits from constraint solving and can handle potentially larger state-spaces, e.g., involving integer clocks and Byzantine faults.
To learn more about TLA+, visit Leslie Lamport's page on TLA+ and his Video course.
Check the releases page for our latest release.
For a stable release, we recommend that you pull the latest docker image with
docker pull ghcr.io/apalache-mc/apalache:main, use the jar from the
most recent release, or checkout the source code from the most recent release
tag.
To try the latest cool features, check out the head of the main branch.
You can also find Apalache packaged via Nix at cosmos.nix
For more information on installation options, see the manual.
Check Apalache examples that demonstrate how to use the strengths of Apalache. Also, check the standard repository of TLA+ examples.
- Read the Beginner's tutorial.
- Read the Apalache user manual.
- Consult the (WIP) Idioms for writing better TLA+.
- Consult the (WIP) TLA+ language manual for engineers.
- Discuss the use of Apalache and R&D on the Apalache Forum.
- Contribute to the development of Apalache.
Currently, Apalache is not funded by any organization. As a result, it is de-facto funded by its current maintainers and contributors, including Igor Konnov, Jure Kukovec, and Thomas Pani. If you would like to sponsor the project, please contact us, or simply sponsor us on GitHub by clicking the "Sponsor" button!
We are grateful for the past financial support in the form of grants or employment from the following organizations:
- Informal Systems (Canada/Switzerland/Austria): 2020-2024
- Vienna Business Agency (Austria): 2021-2023
- Interchain Foundation (Switzerland): 2019-2023
- WWTF (Austria): Vienna Science and Technology Fund 2016-2020
- Inria Nancy and LORIA (France): 2018-2019
- TU Wien (Austria): 2016-2020
More details on the Funding page.
Our current website is served at https://apalache-mc.org .
The site is hosted by github, and changes can be made through PRs into the gh-pages branch of this repository. See the README.md on that branch for more information.
The user documentation is automatically deployed to the website branch as per the CI configuration.