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Best Lean Alternatives in 2026

12 apps from formal verification tools ranked against Lean on the same published basis.

  1. 1
    Z3 Free plan AndroidapiLinuxMacself-hosted Free8.9
    Lean vs Z3
  2. 2
    Rocq Free plan extensionLinuxMacWebWin Free8.2
    Lean vs Rocq
  3. 3
    Isabelle Free plan LinuxMacself-hostedWin Free8.1
    Lean vs Isabelle
  4. 4
    PVS Free plan LinuxMacWin Free8.1
    Lean vs PVS
  5. 5
    ACL2 LinuxMacself-hostedWin 7.4
    Lean vs ACL2
  6. 6
    Frama-C LinuxMacWin 7.2
    Lean vs Frama-C
  7. 7
    CBMC Free plan LinuxMacself-hostedWin Free7.1
    Lean vs CBMC
  8. 8
    SPIN Free plan LinuxMacWin Free7.0
    Lean vs SPIN
  9. 10
    Why3 WebLinuxWin 6.8
    Lean vs Why3
  10. 11
    UPPAAL Free plan LinuxMacWin Free6.8
    Lean vs UPPAAL
  11. 12
    TLA+ WinMacLinux 6.7
    Lean vs TLA+
  12. 13
    Alloy Analyzer Free plan apiLinuxMacWin Free6.7
    Lean vs Alloy Analyzer
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