PVS

Free#4 of 35 in Formal Verification Tools

PVS: A broad, self-hosted environment for hybrid formal verification workflows. Ranked #4 of 35 in Formal Verification Tools by our editors (9.2/10); pricing: Free plan; best for hybrid specification and model checking.

9.2/10Editor score

Visit PVS

PVS9.2 Visit PVS

At a glance

Editor score
9.2 / 10
Pricing
Free plan
Best for
Hybrid specification and model checking
Free plan
Yes
Paid from
Free
Verification method
Hybrid
Founded
1946 · Menlo Park, California, USA
Facts checked
20 Sep 2026

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

Our verdict on PVS

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 higher-order specification language supports predicate subtypes, dependent types, parameterized theories, and type-correctness conditions. The system is available across Linux, macOS, and Windows, with source code under the GPL and additional licensing terms for some commercial use.

Its main strength is the combination of interactive theorem proving and model checking in one environment. Sequent-calculus inference procedures, equality and linear-arithmetic decision procedures, rewriting, induction, and abstraction support proof development. BDD-based symbolic model checking and CTL-model-checking integration address state-based verification, while Yices provides SMT endgame proving and infinite-state bounded model checking. Proof scripting and batch re-proving help maintain theories and libraries, and random testing can help find counterexamples to formulas. These capabilities make PVS a fit for teams that need more than a single verification formalism.

PVS also extends beyond proof construction through code generation or translation to Lisp, C, and Clean, ground evaluation, and PVSio animation with imperative programming features. Integrations include Yices, PVSio, the VSCode PVS Plugin, and the NASA PVS Library. The system is free and open source, but commercial entities without an existing PVS license may need to contact SRI International regarding licensing. Choose PVS when hybrid theorem proving, model checking, proof artifacts, and self-hosted control are priorities. An alternative may be more suitable for teams seeking a narrower tool with a simpler onboarding path or less formal-methods expertise required.

Questions about PVS

What does PVS run on? Linux, macOS and Windows. It runs self-hosted.

What does PVS integrate with? 4 integrations: Yices, PVSio, VSCode PVS Plugin and NASA PVS Library.

Who is PVS built for? Small businesses, mid-market companies and enterprises (our editorial estimate).

Your product? Our editors can test PVS in depth and publish a review, labelled as paid · from $149/mo →

PVS pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on pvs.csl.sri.com

PVS fact sheet

Free plan	Yes
Paid from	Free
Verification method	Hybrid
Supported formalisms	Theorem-proving
Counterexamples	Yes
Proof artifacts	Yes
Input languages	PVS specification language (typed higher-order logic)
Deployment	Self-hosted
Deployment	Self-hosted
Platforms	Linux, macOS, Windows
Support	Email, Community, Docs
Built for	Small business, Mid-market, Enterprise (editorial estimate)
Integrations	4 integrations: Yices, PVSio, VSCode PVS Plugin, NASA PVS Library
Pricing	Free plan
Website	pvs.csl.sri.com
Facts checked	20 Sep 2026

PVS integrations

PVS lists 4 integrations on its own site.

Yices
PVSio
VSCode PVS Plugin
NASA PVS Library

Alternatives to PVS

See all PVS alternatives →

PVS vs the competition

Compare PVS with any tool side by side →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used PVS for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

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Last updated 14 Nov 2026 · How we research and update