Gambit
Gambit: A focused, free Solidity mutation tool with strong Certora Prover integration. Ranked #20 of 25 in Mutation Testing Tools by our editors (7.3/10); pricing: Free plan; best for solidity teams using Certora Prover.
At a glance
- Editor score7.3 / 10
- PricingFree plan
- Best forSolidity teams using Certora Prover
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- AST-based mutation identifies mutation points from Solidity source code.
- Targets mutation runs by contract or function and supports downsampling.
- Reports mutation coverage, rule metrics, patches, and detected mutants.
Where it doesn't
- Supports Solidity only, limiting its use across other programming languages.
- Does not provide quality gates or incremental analysis.
- Verified parallelism and test-framework support are not included.
Our verdict on Gambit
Gambit is an open-source command-line mutation generator for Solidity smart contracts. It introduces controlled code changes, called mutants, to help teams assess whether tests or formal specifications detect faulty behavior. Its audience is Solidity developers and security teams, particularly those already working with Certora Prover or evaluating contract and function-level test coverage.
Its strongest fit is the Certora Prover ecosystem. Gambit integrates with Certora Prover mutation verification and provides mutation coverage and rule metrics, while reports can display mutant patches and detected mutants. AST-based mutation-point identification gives the tool a focused way to generate Solidity mutants, with operators covering binary and unary operations, require statements, assignments, delete expressions, if conditions, argument swaps, and delegatecall elimination. Targeted runs and random mutant downsampling help narrow analysis to the contracts, functions, or sample size that matter for a review.
Gambit is free and open source, with support for macOS, Linux, and Windows. The published installation notes distinguish between documented prebuilt binaries for Linux x86-64 and Mac and source builds for Windows and Linux ARM, so platform choice can affect setup effort. The tool remains deliberately narrow: it supports Solidity rather than multiple languages, and it does not provide verified parallelism, quality gates, or incremental analysis. Choose Gambit when Solidity mutation analysis and Certora Prover integration are the priority. Teams seeking broader language coverage, built-in test-framework support, or workflow controls should consider an alternative.
Questions about Gambit
What does Gambit run on? macOS, Linux and Windows. It runs self-hosted and in the cloud.
What does Gambit integrate with? 1 integration: Certora Prover.
Who is Gambit built for? Solo users, small businesses, mid-market companies and enterprises (our editorial estimate).
Your product? Our editors can test Gambit in depth and publish a review, labelled as paid · from $149/mo →
Gambit pricing
Gambit fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Supported languages | Solidity |
| Test frameworks | Not verified |
| Incremental analysis | Not verified |
| Parallel execution | Not verified |
| Surviving mutant reports | Yes |
| Mutation quality gate | Not verified |
| Mutation operators | binary-op-mutation; unary-operator-mutation; require-mutation; assignment-mutation; delete-expression-mutation; if-cond-mutation; swap-arguments-operator-mutation; elim-delegate-mutation |
| Deployment | Self-hosted, Cloud |
| Platforms | macOS, Linux, Windows |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 1 integrations: Certora Prover |
| Pricing | Free plan |
| Website | certora.com |
| Facts checked | 20 Sep 2026 |
Gambit integrations
Gambit lists 1 integrations on its own site.
- Certora Prover
Alternatives to Gambit
- ArcMutateA broad JVM mutation testing suite with CI workflows, quality gates and a free plan.9.4
- PITA mature open-source choice for Java teams that need configurable mutation analysis.9.3
- Stryker MutatorA broad, open-source mutation testing toolkit with strong CI and reporting support.9.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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