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Head-to-head · Formal Verification Tools

Rocq vs TLA+

  • Updated Nov 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Rocq #3 in Formal Verification Tools 9.3/10 Free plan Free plan✓ 1 of 2 features Visit Rocq
TLA+ #8 in Formal Verification Tools 8.7/10 Open source ✓ 1 of 2 features Visit TLA+ site

Rocq leads on 0 checks, TLA+ 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 scoreRocq · 9.3/10
  • Free planonly Rocq

Rocq scores higher on our rubric for formal verification tools: 9.3 against 8.7 out of 10; our editors rank them #3 and #8.

On verification method, TLA+ gives you Hybrid where Rocq offers Deductive. On supported formalisms, Rocq gives you Theorem-proving where TLA+ offers Invariants. On deployment, TLA+ gives you Both where Rocq offers Self-hosted.

Rocq is the better fit for certified theorem proving with strong tooling. TLA+ is the better fit for distributed-system modeling and checking.

  • Rocq fits best

    Certified theorem proving with strong tooling

  • TLA+ fits best

    Distributed-system modeling and checking

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Side by side

Feature Rocq 9.3/10 Visit ↗ TLA+ 8.7/10 Visit ↗
At a glance
Editor score 9.3 8.7
Ranking #3 in Formal Verification Tools #8 in Formal Verification Tools
Best for Certified theorem proving with strong tooling Distributed-system modeling and checking
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted, Desktop Cloud, Self-hosted, Desktop
Platforms Windows, macOS, Linux Windows, macOS, Linux
Support Community, Docs Email, Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Rocq 1/2 · TLA+ 1/2
Counterexamples Not checked yet ✓ (best)
Proof artifacts ✓ (best) Not checked yet
Specs
Verification method Deductive Hybrid
Supported formalisms Theorem-proving Invariants
Input languages Gallina and Rocq vernacular TLA+ and PlusCal
Deployment Self-hosted Both
Our review
Pros
  • Kernel machine-checks proof terms through a small certification kernel
  • Extracts certified programs to OCaml, Haskell, and Scheme
  • Supports RocqIDE, major editors, Docker, and opam
  • Combines TLC, Apalache, TLAPS, PlusCal, and IDE support
  • Checks safety, liveness, invariants, proofs, and error traces
  • Supports Windows, macOS, Linux, and local or other deployment modes
Cons
  • Focused on theorem proving rather than broader verification formalisms
  • Self-hosted deployment requires managing the local environment
  • No commercial pricing tiers or vendor-hosted plan options
  • The legacy Eclipse-based Toolbox is described as unmaintained
  • Its formal models sit above the implementation level
  • Different verification needs span several distinct tools
Our verdict

Rocq is an open-source interactive theorem prover and dependently typed programming language for mathematical formalisation, education, research, and verified software development. It lets users define programs, predicates, mathematical…

Read the review →

TLA+ is an open-source formal specification language and tool ecosystem for modeling software and hardware above the implementation level. It is especially suited to concurrent and distributed systems, where engineers need to express…

Read the review →
  1. RocqFormal Verification Tools 9.3Free plan
  2. TLA+Formal Verification Tools 8.7Open source

Strengths and trade-offs

  • Rocq — where it wins

    • Kernel machine-checks proof terms through a small certification kernel
    • Extracts certified programs to OCaml, Haskell, and Scheme
    • Supports RocqIDE, major editors, Docker, and opam

    Where it doesn't

    • Focused on theorem proving rather than broader verification formalisms
    • Self-hosted deployment requires managing the local environment
    • No commercial pricing tiers or vendor-hosted plan options

  • TLA+ — where it wins

    • Combines TLC, Apalache, TLAPS, PlusCal, and IDE support
    • Checks safety, liveness, invariants, proofs, and error traces
    • Supports Windows, macOS, Linux, and local or other deployment modes

    Where it doesn't

    • The legacy Eclipse-based Toolbox is described as unmaintained
    • Its formal models sit above the implementation level
    • Different verification needs span several distinct tools
  • Rocq9.3/10 · Free plan

    A free, kernel-checked theorem prover with dependent types, automation, and certified extraction.

    Visit RocqFull verdict →
  • TLA+8.7/10 · Open source

    A broad open-source toolkit for modeling, checking, and proving system behavior.

    Visit TLA+ siteFull 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