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Isabelle vs Z3

Isabelle

6.5 #6 in Formal Verification Tools

About Isabelle

Z3

6.7 #2 in Formal Verification Tools

About Z3
IsabelleZ3
Free planYesYes
Free trialNoNo
Paid fromFreeFree
Open sourceNoNo
PlatformsLinux, macOS, self-hosted, WindowsAndroid, api, Linux, macOS, self-hosted, Web, Windows
Free planYesYes
Verification methoddeductive—
Supported formalismstheorem-provingtheorem-proving
CounterexamplesYesYes
Proof artifactsYesYes
Input languagesIsabelle/Isar, Isabelle/Pure, ML; executable specifications can generate SML, OCaml, Haskell, and ScalaSMT-LIB2, C, C++, .NET, Java, Python, Rust, OCaml, Julia, JavaScript, TypeScript, Smalltalk, Go
Deploymentself-hostedself-hosted

Both are listed in Best Formal Verification Tools. On Freedom251, Z3 scores higher on our published basis.