Head-to-head · Formal Verification Tools
PVS vs ACL2
PVS leads on 0 checks, ACL2 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 planboth
PVS scores higher on our rubric for formal verification tools: 9.2 against 7.6 out of 10; our editors rank them #4 and #19.
On verification method, PVS gives you Hybrid where ACL2 offers Deductive.
PVS is the better fit for hybrid specification and model checking. ACL2 is the better fit for software and hardware theorem proving.
- PVS fits best
Hybrid specification and model checking
- ACL2 fits best
Software and hardware theorem proving
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Side by side
| Feature | PVS 9.2/10 Visit ↗ | ACL2 7.6/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 9.2 | 7.6 |
| Ranking | #4 in Formal Verification Tools | #19 in Formal Verification Tools |
| Best for | Hybrid specification and model checking | Software and hardware theorem proving |
| Pricing model | Free | Free |
| Starting price | Free plan | Free plan |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Self-hosted | Self-hosted |
| Platforms | Linux, macOS, Windows | Windows, macOS, Linux |
| Support | Email, Community, Docs | Community, Docs |
| Built for | Small business, Mid-market, Enterprise | Solo, Small business, Mid-market, Enterprise |
| Features PVS 2/2 · ACL2 2/2 | ||
| Counterexamples | ✓ | ✓ |
| Proof artifacts | ✓ | ✓ |
| Specs | ||
| Verification method | Hybrid | Deductive |
| Supported formalisms | Theorem-proving | Theorem-proving |
| Input languages | PVS specification language (typed higher-order logic) | ACL2 logic and a subset of applicative Common Lisp |
| Deployment | Self-hosted | Self-hosted |
| Our review | ||
| Pros |
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| Cons |
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| 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 → |
ACL2 is an interactive theorem prover and programming language for modeling computer systems and proving properties about those models. Its logic is based on a subset of applicative Common Lisp, making it suitable for teams working with… Read the review → |
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
ACL2 — where it wins
- Combines rewriting, induction, symbolic simulation, BDD and SAT reasoning
- Supports software and hardware verification with community-maintained libraries
- Provides counterexamples and certified books with machine-readable artifacts
Where it doesn't
- Self-hosted distribution requires local source code or executable installation
- Uses ACL2 logic and a subset of applicative Common Lisp
- Windows deployments typically involve Unix emulation or a virtual machine
- PVS9.2/10 · Free plan
A broad, self-hosted environment for hybrid formal verification workflows.
Visit PVSFull verdict → - ACL27.6/10 · Free plan
A free, self-hosted prover for software and hardware verification with deep deductive reasoning.
Visit ACL2Full 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