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Frama-C

Free#11 of 35 in Formal Verification ToolsC and C++ Static Analysis Tools

Frama-C: A flexible, self-hosted toolkit for combining formal analyses of C programs. Ranked #11 of 35 in Formal Verification Tools by our editors (8.4/10); pricing: Free plan; best for formal verification of C programs.

8.4/10★★★★☆Editor score

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At a glance

• Editor score
  8.4 / 10
• Pricing
  Free plan
• Best for
  Formal verification of C programs
• Free plan
  Yes
• Paid from
  Free
• Verification method
  Hybrid
• Facts checked
  20 Sep 2026

• Where it wins

  • Combines abstract interpretation, deductive verification, and runtime checking
  • Supports ACSL contracts, verification conditions, assertions, and invariants
  • Integrates with Alt-Ergo, CVC5, Z3, Coq, and Why3

• Where it doesn't

  • Focused on C programs and the ACSL specification language
  • Requires local installation on Windows, macOS, or Linux
  • Its modular plug-in model may require selecting separate analysis workflows

Our verdict on Frama-C

Frama-C is an open-source framework for analyzing and verifying C programs with formal methods. It is suited to education, research, and industrial software assurance, including safety- and security-critical development. The platform supports ACSL specifications for function contracts, assertions, and invariants, and provides both graphical and command-line workflows. Its self-hosted deployment is available on Windows, macOS, and Linux.

Its main strength is the breadth of verification methods available within one framework. The Eva plug-in provides abstract interpretation and value analysis, while WP supports deductive verification of ACSL contracts. E-ACSL adds runtime assertion checking, and Frama-C can generate verification conditions for program properties. These capabilities support a hybrid approach rather than a single formalism, making the product a fit for teams that need to combine static analysis, specification, runtime checks, and code exploration.

Frama-C also fits environments that rely on external provers and proof assistants. Published integrations include Alt-Ergo, CVC5, Z3, Coq, and Why3, giving users options for automated proving and interactive proof workflows. The plug-in architecture allows analyses to be combined, but teams must shape their workflow around the relevant plug-ins, ACSL annotations, and prover integrations. Frama-C should appeal to organizations seeking a free, open-source framework for formal C verification; teams working primarily outside C or seeking a hosted service should choose a different tool.

Questions about Frama-C

What does Frama-C run on? Windows, macOS and Linux. It runs self-hosted and as a desktop app.

What does Frama-C integrate with? 5 integrations: Alt-Ergo, CVC5, Z3, Coq and Why3.

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

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

Frama-C pricing

Frama-C fact sheet

Frama-C integrations

Frama-C lists 5 integrations on its own site.

• Alt-Ergo
• CVC5
• Z3
• Coq
• Why3

Alternatives to Frama-C

• IIsabelleA free, open-source proof assistant for broad mathematical and systems verification.9.4
• RocqA free, kernel-checked theorem prover with dependent types, automation, and certified extraction.9.3
• PPVSA broad, self-hosted environment for hybrid formal verification workflows.9.2

See all Frama-C alternatives →

Also Ranked In

Frama-C is ranked in 2 of our directories.

• #8C and C++ Static Analysis Tools25 tools ranked→

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Featured on iTechGuides

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

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Last updated 14 Nov 2026 · How we research and update