Lean comparisons
Lean is compared head-to-head with Isabelle, Rocq and PVS and more: 7 head-to-heads in Formal Verification Tools, each with the specs and prices we checked.
Lean head-to-head
Lean vs each of them
| # | Tool | Free plan | Paid from | Verification method | Supported formalisms | Counterexamples | Proof artifacts | Input languages | Score |
|---|---|---|---|---|---|---|---|---|---|
| 5 | Lean | Free | Deductive | Theorem-proving | Yes | Lean 4 | 9.1 | ||
| 2 | Isabelle | Yes | Free | Deductive | Theorem-proving | Yes | Yes | Isabelle/Isar, Isabelle/Pure, ML; executable specifications can generate SML, OCaml, Haskell, and Scala | 9.4 |
| 3 | Rocq | Yes | Free | Deductive | Theorem-proving | Yes | Gallina and Rocq vernacular | 9.3 | |
| 4 | PVS | Yes | Free | Hybrid | Theorem-proving | Yes | Yes | PVS specification language (typed higher-order logic) | 9.2 |
| 6 | NuSMV | Yes | Free | Hybrid | Temporal-logic | Yes | SMV | 9.0 | |
| 7 | SPIN | Yes | Free | Model-checking | Temporal-logic | Yes | Promela | 8.8 | |
| 8 | TLA+ | Free | Hybrid | Invariants | Yes | TLA+ and PlusCal | 8.7 | ||
| 9 | UPPAAL | Yes | Model-checking | Invariants | Yes | UPPAAL timed-automata modeling language | 8.6 |
Compare Lean with any formal verification tool
These are the matchups our editors wrote up. The compare tool pairs Lean with any other product in Formal Verification Tools — and up to four at once — from the same checked specs.
Compare Lean with any tool side by side →
Every formal verification tools head-to-head →
Our full Lean verdict, pricing and fact sheet →
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Compared by iTechGuides Editors · Editorial team · Updated Nov 2026
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