Symbolic formula representation and solver interaction library
Haskell
178
1,304 commits
updated Sep 21, 2026
README
What4 is a library for representing symbolic terms and communicating with satisfiability and SMT solvers (e.g. Yices and Z3).
It was originally a part of the Crucible project, but has found use cases that are independent of its original purpose as the representation language for the Crucible symbolic simulator, and has thus been split out into a separate repository.
For an overview of What4 and how to use it, please see the package-level README.
This material is based upon work supported by the Defense Advanced Research Projects Agency (DARPA) under Contract No. HR0011-19-C-0070. The views, opinions, and/or findings expressed are those of the author(s) and should not be interpreted as representing the official views or policies of the Department of Defense or the U.S. Government.
Solver Compatibility
| Feature | ABC | Bitwuzla | Boolector | CVC4 | CVC5 | Dreal | STP | Yices | Z3 |
|---|---|---|---|---|---|---|---|---|---|
| Supported | yes | yes | >= 3.2.0, ? | >= 1.8, ? | 1.0.2 | yes | >= 2.3.3, ? | 2.6.x, ? | 4.8.8 -- 4.8.14 |
| goal timeouts | ? | yes | yes | yes | yes | ? | yes | yes | ! (4.8.11 or 4.8.12) |
| strings with unicode and escape codes | ? | no | ? | >= 1.8 | yes | ? | ? | ? | >= 4.8.11 |
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Similar repos
Languages
Haskell
99.6%
Symbolic formula representation and solver interaction library
Haskell
178
1,304 commits
updated Sep 21, 2026
README
What4 is a library for representing symbolic terms and communicating with satisfiability and SMT solvers (e.g. Yices and Z3).
It was originally a part of the Crucible project, but has found use cases that are independent of its original purpose as the representation language for the Crucible symbolic simulator, and has thus been split out into a separate repository.
For an overview of What4 and how to use it, please see the package-level README.
This material is based upon work supported by the Defense Advanced Research Projects Agency (DARPA) under Contract No. HR0011-19-C-0070. The views, opinions, and/or findings expressed are those of the author(s) and should not be interpreted as representing the official views or policies of the Department of Defense or the U.S. Government.
Solver Compatibility
| Feature | ABC | Bitwuzla | Boolector | CVC4 | CVC5 | Dreal | STP | Yices | Z3 |
|---|---|---|---|---|---|---|---|---|---|
| Supported | yes | yes | >= 3.2.0, ? | >= 1.8, ? | 1.0.2 | yes | >= 2.3.3, ? | 2.6.x, ? | 4.8.8 -- 4.8.14 |
| goal timeouts | ? | yes | yes | yes | yes | ? | yes | yes | ! (4.8.11 or 4.8.12) |
| strings with unicode and escape codes | ? | no | ? | >= 1.8 | yes | ? | ? | ? | >= 4.8.11 |
Similar repos
Contributors
Languages
Haskell
99.6%