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This is the official repository for the Soufflé language project. The Soufflé language is similar to Datalog (but has terms known as records), and is frequently used as a domain-specific language for analysis problems.

License: UPL CI-Tests MSVC-CI-Tests codecov

Features of Soufflé

  • Efficient translation to parallel C++ of Datalog programs (CAV'16, CC'16)

  • Efficient interpretation using de-specialization techniques (PLDI'21)

  • Specialized data structure for relations (PACT'19, PPoPP'19, PMAM'19) with optimal index selection (VLDB'18)

  • Extended semantics of Datalog, e.g., permitting unbounded recursions with numbers and terms

  • Simple component model for Datalog specifications

  • Recursively defined record types/ADTs (aka. constructors) for tuples

  • User-defined functors

  • Strongly-typed types for safety

  • Subsumption

  • Aggregation

  • Choice Construct (APLAS'21)

  • Extended I/O system for relations (including SQLITE3 interfaces)

  • C++/SWIG interfaces

  • Provenance/Debugging (TOPLAS'20)

  • Profiling tools

How to get Soufflé

Use git to obtain the source code of Soufflé.

$ git clone git://

Build instructions can be found here.

Legacy code

If you have written code for an older version of Souffle, please use the command line flag --legacy. Alternatively, please add the following line to the start of your source-code:

.pragma "legacy"

Issues and Discussions

Use either the issue list for

  • bug reporting

  • enhancements

  • documentation

  • proposals

  • releases

  • compatibility issues

  • refactoring.

or use the discussions bulletin board to engage with other community members and for asking questions you’re wondering about.

How to contribute

Issues and bug reports for Souffle are found in the issue list. This list is also where new contributors may find extensions / bug fixes to work on.

To contribute in this repo, please open a pull request from your fork of this repository. The general workflow is as follows.

  1. Find an issue in the issue list.

  2. Fork the souffle-lang/souffle repo.

  3. Push your changes to a branch in your forked repo.

  4. Submit a pull request to souffle-lang/souffle from your forked repo.

Our continuous integration framework enforces coding guidelines with the help of clang-format and clang-tidy.

For more information on building and developing Souffle, please read the developer tutorial.

Home Page





For academics

If you use our work, please cite our work. A list of publications can be found here. The main publications are:

  • Herbert Jordan, Bernhard Scholz, Pavle Subotić: Souffle: On Synthesis of Program Analyzers. CAV 2016.
  • Bernhard Scholz, Herbert Jordan, Pavle Subotić, Till Westmann: On fast large-scale program analysis in Datalog. CC 2016: 196-206


Soufflé is a variant of Datalog for tool designers crafting analyses in Horn clauses. Soufflé synthesizes a native parallel C++ program from a logic specification.








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