Mamba
Mamba: A focused, open-source BDD runner for local Python specifications. Ranked #27 of 29 in BDD Testing Tools by our editors (5.6/10); pricing: Free plan; best for minimal Python behavior specifications.
At a glance
- Editor score5.6 / 10
- PricingFree plan
- Best forMinimal Python behavior specifications
- Free planYes
- Paid fromFree
- Gherkin supportYes
- Facts checked21 Sep 2026
Where it wins
- Python-native BDD syntax with descriptions, contexts, and examples
- Local command-line execution with pass/fail reporting
- Configurable coverage, tags, output, and slow-test thresholds
Where it doesn't
- No hosted execution or commercial plans
- No browser testing or parallel execution
- Focused on Python applications and libraries
Our verdict on Mamba
Mamba is an open-source Python test runner for developers testing Python applications and libraries with behavior-driven development. It expresses expected behavior through Python constructs such as descriptions, contexts, and examples, rather than requiring a separate specification language. Developers install it as a Python package and execute specification files locally from the command line. That makes Mamba a focused choice for teams that want BDD-style structure while keeping specifications close to Python code.
Its strongest fit is a compact local workflow. Mamba reports passing and failing examples, supports configurable documentation output, and includes settings for code coverage, tag filtering, colors, and slow-test thresholds. These controls give developers useful ways to organize specifications and tune reporting without expanding beyond the core test-runner role. The published scope is centered on Python execution, so it suits applications and libraries where local command-line testing is the priority.
Mamba is less suitable when a BDD program depends on browser testing, hosted execution, parallel execution, or an API. It also does not offer commercial plans, making it a straightforward open-source option rather than a broader managed testing platform. Choose Mamba for minimal Python behavior specifications and local execution; consider an alternative when the team needs browser coverage, distributed or parallel runs, or a wider integration ecosystem.
Your product? Our editors can test Mamba in depth and publish a review, labelled as paid · from $149/mo →
Mamba pricing
Mamba fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Gherkin support | Yes |
| Supported languages | Not verified |
| Execution mode | Local |
| Parallel execution | Not verified |
| Browser testing | Not verified |
| API access | Not verified |
| Deployment | Self-hosted |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 21 Sep 2026 |
Alternatives to Mamba
- Cucumber OpenA mature, extensible Cucumber workflow for local and CI-based BDD testing.9.1
- CucumberStudioA shared BDD workspace connecting Gherkin, test execution, automation results, and documentation.8.6
- KarateA self-hosted testing framework spanning API, UI, performance, and mock testing.8.3
Used Mamba? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Mamba for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Mamba is listed in our BDD Testing Tools directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/mamba-bdd-testing-tool/"><img src="https://www.itechguides.com/best/badge/mamba-bdd-testing-tool.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update