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CBMC

Free#15 of 34 in Formal Verification Tools

CBMC: A free, self-hosted verifier for bounded path, safety, and contract analysis. Ranked #15 of 34 in Formal Verification Tools by our editors (5.9/10); pricing: Free plan; best for bounded verification of C, C++, and Java.

5.9/10Editor score
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CBMC5.9 Visit CBMC

At a glance

  • Editor score
    5.9 / 10
  • Pricing
    Free plan
  • Best for
    Bounded verification of C, C++, and Java
  • Free plan
    Yes
  • Paid from
    None
  • Verification method
    Model-checking
  • Facts checked
    20 Sep 2026
CBMC screenshot

  • Where it wins

    • Generates counterexample traces when verified properties fail
    • Checks array bounds, pointer safety, assertions, and contracts
    • Supports C, C++, Java bytecode, SAT, SMT, XML, and JSON

  • Where it doesn't

    • Analysis is bounded rather than an unbounded verification approach
    • Self-hosted deployment requires managing the local environment
    • Primary source coverage centers on C, C++, and Java bytecode

Our verdict on CBMC

CBMC is an open-source bounded model checker for C and C++ programs, with Java bytecode analysis available through JBMC. It explores bounded program paths, checks assertions and common safety properties, and produces counterexample traces when properties fail. Its scope suits developers, verification engineers, and research teams working with C, C++, Java bytecode, or SystemC who need reproducible property checking in a self-hosted environment. The project is distributed under a 4-clause BSD license and runs on Windows, macOS, and Linux.

Its strongest technical fit is path and safety analysis. CBMC accepts C and C++ source code as well as GOTO-binary input, supports multiple C and C++ language standards, and includes checks for array bounds and pointer safety. Function and loop contracts extend the analysis beyond basic assertions, while SAT and SMT solver backends provide alternative solving paths. Failed properties can be investigated through generated counterexample traces, and XML and JSON output interfaces support downstream processing. JBMC adds analysis for Java classes and JAR files, making the tool broader than a C and C++ checker while keeping bounded model checking at its center.

CBMC is a good choice when a team wants free, open-source, self-hosted verification with contracts, safety properties, and machine-readable results. The bounded method makes it appropriate for examining selected path depths and diagnosing concrete failing traces, but teams seeking an unbounded verification approach should consider a different tool. Its language focus is also deliberate: projects outside C, C++, Java bytecode, and SystemC may not fit its supported input model. Choose CBMC for controlled, technical verification workflows; avoid it when the priority is a broad language ecosystem or verification beyond bounded paths.

CBMC pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on diffblue.github.io

CBMC fact sheet

Free planYes
Paid fromNone
Verification methodModel-checking
Supported formalismsContracts
CounterexamplesYes
Proof artifactsNot verified
Input languagesC, C++, Java bytecode, SystemC
DeploymentSelf-hosted
DeploymentSelf-hosted
PlatformsWindows, macOS, Linux
SupportDocs, Community
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
PricingFree plan
Websitediffblue.github.io
Facts checked20 Sep 2026

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Featured on iTechGuides

Featured on iTechGuides — CBMC 5.9/10

CBMC is listed in our Formal Verification Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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