Gambit vs muttest
Gambit
certora.commuttest
jakubsob.github.ioSide by side
| Figure | Gambit | muttest |
|---|---|---|
| Price from | — | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Plans published | 0 | 0 |
| Spec score · Mutation Testing Tools | 7.8 (#8) | 7.1 (#19) |
| Intended users | The maker describes Gambit as usable on any Solidity project. | The project describes mutation testing as a way to find weak assertions in test suites, including suites generated with LLMs. |
| License | The Gambit GitHub repository identifies its license as MIT. | The package is licensed under MIT plus a LICENSE file. |
| Maker | Gambit is built and maintained as an open-source project by the Certora team. | The maker identifies himself as Jakub Sobolewski, a software engineer specializing in R and Shiny. |
| Purpose | Gambit is an open source Solidity mutation testing tool that evaluates and strengthens a testing suite. | muttest measures test quality by applying small changes to code and checking whether the test suite catches them. |
In their own words
Gambit
Gambit is a free, open-source mutation testing tool for Solidity projects. It generates altered contract versions, called mutants, to measure whether a test suite or formal verification specification detects faults. Gambit locates mutation points by traversing a program’s abstract syntax tree and applying predefined syntax transformations. A declarative configuration language lets users tailor mutations to specific parts of a program. Results can be viewed in a dashboard that summarizes mutant verification and calculates a specification score. Gambit can work with the Certora Prover to evaluate formal specifications; that workflow generates mutants and submits a verification job for each to Certora’s server. The command line includes `mutate` for generating mutants and `summary` for presenting them. A compatible `solc` binary is required for the project being mutated. Gambit supports Solidity and is listed for Linux, macOS, and Windows, though prebuilt binaries are available for Linux x86-64 and Mac; Windows and Linux ARM users must build from source. Function-call and swap-arguments-function mutation operators are disabled. The repository identifies the license as MIT. Certora directs product questions to its Help Desk channel on Discord.
muttest
muttest is a free R package for mutation testing: it changes selected parts of R code and runs tests to measure which changes the test suite catches. Its mutation score reports the percentage of mutations caught, helping identify weak assertions. Users can choose what to change and where, with mutators for operators, boolean and NA or NULL values, function calls, strings, numbers, indexes, conditions, negation, and return values. Presets group common mutation types, including arithmetic, comparison, logical, numeric, string, and condition changes. Examples use testthat and show how changing comparison operators can expose untested boundary cases. Reports are available in HTML and JSON, with feedback on files that may need stronger assertions. Documentation links a guide for running checks in CI, including GitHub Actions, score badges, and thresholds. A July 2026 update describes parallel execution. The package supports Linux, macOS, and Windows, is licensed under MIT plus a LICENSE file, and requires R version 4.1.0 or later according to its CRAN listing.