Gopter
Gopter: A focused Go library for generated tests, shrinking, and stateful command sequences. Ranked #14 of 27 in Property-Based Testing Tools by our editors (8.0/10); pricing: Free plan; best for go teams needing stateful properties.
At a glance
- Editor score8.0 / 10
- PricingFree plan
- Best forGo teams needing stateful properties
- Free planYes
- Paid fromFree
- Supported languagesGo
- Facts checked20 Sep 2026
Where it wins
- Generates and shrinks test cases to isolate failures
- Supports stateful testing with command sequences
- Runs deterministic tests with seeded randomness
Where it doesn't
- Supports Go rather than multiple programming languages
- Requires integration into a Go test suite
- Is a library, not a hosted testing application
Our verdict on Gopter
Gopter is an open-source property-based testing library for Go developers who need generated test data and broader coverage than example-based tests alone. It provides property runners, arbitrary-value helpers, regex-match generation, custom generator control, and shrinking that reduces failing inputs. Go testing package integration keeps it suitable for standard Go test workflows, while GoConvey helpers extend its fit to that testing ecosystem.
Its strongest capability is the combination of generation, reproducibility, and stateful testing. Teams can define properties over generated inputs, use command sequences for stateful scenarios, and rerun failures with deterministic seeded test runs. Custom generator control helps shape inputs for domain-specific cases instead of relying only on predefined values. Shrinking is particularly useful when generated cases fail, because it helps reduce a complex input to a smaller case that is easier to inspect.
Gopter is free to adopt under an open-source model, with the main implementation work centered on adding it to a Go codebase and test suite. It is a focused choice for Go teams that want generative testing, reproducible failures, and command-based state modeling in code. Teams working across several programming languages, or looking for a hosted application with managed execution and a separate user interface, should choose a broader tool instead.
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Gopter pricing
Gopter fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Supported languages | Go |
| Test runner support | Go testing package; GoConvey |
| Failing-case shrinking | Yes |
| Stateful testing | Yes |
| Reproducible failures | Yes |
| Cases per run | Not verified |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 1 integrations: GoConvey |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Gopter integrations
Gopter lists 1 integrations on its own site.
- GoConvey
Alternatives to Gopter
- fast-checkA deep, runner-agnostic testing library for JavaScript and TypeScript teams.9.4
- HypothesisA focused Python library for generated inputs, shrinking, and stateful tests.9.3
- ProptestA focused Rust framework for generated inputs, shrinking, replay, and stateful tests.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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