CoverUp
By UMass PLASMA. Category: Unit test generation. Homepage
The CoverUp README describes a research tool from the PLASMA lab at UMass Amherst that uses large language models to generate Python unit tests that increase code coverage. It measures coverage with SlipCover and prompts a model to write pytest tests for code that is not yet covered. Supported model providers are OpenAI, Anthropic and AWS Bedrock, with the user's own API key. CoverUp is installed with pip and runs locally, with a documented Docker option. It is released under the Apache 2.0 licence.
Description written from the vendor's documentation.
Status
Status: Active
Facts
| Fact | Value | Evidence | Source | Verified on |
|---|---|---|---|---|
| Status | Active | Documented | pypi.org | |
| AI capabilities | Documented | github.com | ||
| Test creation | Documented | github.com | ||
| Test output | Not documented | Not documented | None found | |
| Surfaces | Not documented | Not documented | None found | |
| Hosting | Documented | github.com | ||
| Pricing model | Documented | pypi.org | ||
| Free tier | Yes | Documented | pypi.org | |
| CI integrations | Not documented | Not documented | None found | |
| Self-healing | None documented | Not documented | None found | |
| Open source | Yes, licence Apache-2.0 | Documented | github.com |
Published prices
No prices are published.
Vendor-stated, verbatim
What UMass PLASMA says about its product, quoted as published and not confirmed in documentation.
“In just over a minute, CoverUp increases Flask's test coverage from 90.9% to 94.4%.”
“As the graph shows, CoverUp achieves higher coverage than CodaMosa for most modules.”
Alternatives
Tools in the same category (Unit test generation), ordered by the number of shared creation and surface values, then by name. Each line lists documented facts that differ from CoverUp.
- ChatUniTest: Unit test generation; no documented difference in output, creation, hosting or free tier
- CodeRabbit: documents hosting cloud
- Diffblue Cover: Unit test generation; no documented difference in output, creation, hosting or free tier
- EarlyAI: documents status shut down
- GitAuto: documents hosting cloud
- GPT4Go: Unit test generation; no documented difference in output, creation, hosting or free tier
Questions
Is this page a review of CoverUp?
No. This page is a fact sheet. Each fact shows its evidence level, its source and the date it was checked. We do not rate or rank tools.
Does CoverUp have a free tier?
Yes. CoverUp has a free tier. This is documented, checked on 2026-09-24.
What test output does CoverUp produce?
The test output format is not documented as of 2026-09-24.
Is CoverUp still available?
Status: Active, checked on 2026-09-24.
Sources
Spotted an outdated or wrong fact about CoverUp? Send the source and we apply it at the next monthly update.