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Head-to-head · Formal Verification Tools

PVS vs Lean

  • Updated Nov 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score PVS #4 in Formal Verification Tools 9.2/10 Free plan Free plan✓ 2 of 2 features Visit PVS
Lean #5 in Formal Verification Tools 9.1/10 Open source ✓ 1 of 2 features Visit Lean

PVS leads on 0 checks, Lean on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePVS · 9.2/10
  • Free planonly PVS
  • Most featuresPVS · 2 of 2

PVS scores higher on our rubric for formal verification tools: 9.2 against 9.1 out of 10; our editors rank them #4 and #5.

On verification method, PVS gives you Hybrid where Lean offers Deductive. On deployment, Lean gives you Both where PVS offers Self-hosted.

PVS is the better fit for hybrid specification and model checking. Lean is the better fit for modern dependent-type verification.

  • PVS fits best

    Hybrid specification and model checking

  • Lean fits best

    Modern dependent-type verification

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Side by side

Feature PVS 9.2/10 Visit ↗ Lean 9.1/10 Visit ↗
At a glance
Editor score 9.2 9.1
Ranking #4 in Formal Verification Tools #5 in Formal Verification Tools
Best for Hybrid specification and model checking Modern dependent-type verification
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted Cloud, Self-hosted
Platforms Linux, macOS, Windows Web, Windows, macOS, Linux
Support Email, Community, Docs Community, Docs
Integrations 4 integrations 1 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features PVS 2/2 · Lean 1/2
Counterexamples ✓ (best) Not checked yet
Proof artifacts ✓ ✓
Specs
Verification method Hybrid Deductive
Supported formalisms Theorem-proving Theorem-proving
Input languages PVS specification language (typed higher-order logic) Lean 4
Deployment Self-hosted Both
Our review
Pros
  • Combines higher-order theorem proving with BDD/CTL model checking
  • Supports SMT proving, random testing, and counterexample discovery
  • Runs on Linux, macOS, and Windows with useful integrations
  • Kernel-based checking produces independently checkable proof terms.
  • Tactics and metaprogramming support extensible proof automation.
  • Works across web, desktop, Linux, and self-hosted environments.
Cons
  • Its breadth requires expertise in formal methods and proof development
  • Self-hosted deployment places setup and maintenance on the user
  • Commercial use may require additional licensing through SRI
  • Its formalism focus is theorem-proving rather than a broad multi-formalism toolkit.
  • The listed editor integration is centered on Visual Studio Code.
  • Lean 4 is the listed input language for formalization workflows.
Our verdict

PVS is a self-hosted formal specification and verification environment for researchers and engineers working on formalizations, proofs, protocols, distributed systems, and safety-critical software or hardware specifications. Its typed…

Read the review →

Lean combines interactive theorem proving with a dependently typed functional programming language. It is intended for formalizing mathematics, verifying software and hardware, and developing reliable programs. The open-source distribution…

Read the review →
  1. PVSFormal Verification Tools 9.2Free plan
  2. LeanFormal Verification Tools 9.1Open source

Strengths and trade-offs

  • PVS — where it wins

    • Combines higher-order theorem proving with BDD/CTL model checking
    • Supports SMT proving, random testing, and counterexample discovery
    • Runs on Linux, macOS, and Windows with useful integrations

    Where it doesn't

    • Its breadth requires expertise in formal methods and proof development
    • Self-hosted deployment places setup and maintenance on the user
    • Commercial use may require additional licensing through SRI

  • Lean — where it wins

    • Kernel-based checking produces independently checkable proof terms.
    • Tactics and metaprogramming support extensible proof automation.
    • Works across web, desktop, Linux, and self-hosted environments.

    Where it doesn't

    • Its formalism focus is theorem-proving rather than a broad multi-formalism toolkit.
    • The listed editor integration is centered on Visual Studio Code.
    • Lean 4 is the listed input language for formalization workflows.
  • PVS9.2/10 · Free plan

    A broad, self-hosted environment for hybrid formal verification workflows.

    Visit PVSFull verdict →
  • Lean9.1/10 · Open source

    A kernel-checked Lean 4 environment for formal mathematics and verified programs.

    Visit LeanFull verdict →

More comparisons

All formal verification tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated · How we research and update