Undercover for Ruby
Find untested changes and stop shipping untested pull requests
SubscriptionCICodeMonitoring9,052 impressions#5 of its week
Undercover checks Ruby pull requests for untested code changes using structure-aware coverage analysis.
- for
- Ruby developers and engineering teams using GitHub.
- pricing
- freemium · free trial
- license
- MIT
Key features
- Changed-code coverage detection — Flags methods or blocks in a PR diff that lack line or branch coverage.
- GitHub Check annotations — Posts a single comment per method directly on the PR with coverage details.
- Coverage dashboards — Shows coverage trends per repository, branch and time on a web dashboard.
- Local CLI tool — Run `undercover` against a diff locally or in CI for fast feedback before push.
- Support for all Ruby test frameworks — Works with RSpec, Minitest, SimpleCov and other Ruby testing tools.
- Private repo trial — 14-day free trial for private repositories with no seat-based pricing.
Use cases
- Prevent merging PRs that introduce uncovered Ruby methods.
- Validate AI-generated code changes meet coverage requirements.
- Monitor coverage health over time for a Ruby codebase.
Undercover for Ruby pricing
- Open SourceFreeFree forever for public repos · Unlimited team size · GitHub check annotations
- Essentials$69/monthPrivate repos support · 1,000 monthly check builds · 3 concurrent builds · Email support
- Pro$279/monthUnlimited check builds · Unlimited concurrent builds · API access · 24h SLA email support
Undercover for Ruby vs alternatives
 Undercover for Ruby |  Fluent CI |  Attractor |  Tail Lens for Tailwind |  Automock | |
|---|---|---|---|---|---|
| Best for | Detecting untested changes in Ruby PRs | TypeScript-based CI pipelines | Accelerating Ruby/JS app delivery | Tailwind UI editing | TypeScript unit test generation |
| Pricing | Freemium | Free | Subscription | One time fee | Free |
| DevHunt upvotes | 12 | 158 | 25 | 47 | 148 |
| Launched | May 2024 | Jan 2024 | Feb 2024 | Nov 2025 | Jan 2023 |
- Undercover for Ruby vs Fluent CI: Fluent CI lets you write CI pipelines in TypeScript, not focused on Ruby coverage checks.
- Undercover for Ruby vs Attractor: Attractor helps ship Ruby and JavaScript apps fast but does not provide per-PR coverage analysis.
- Undercover for Ruby vs Tail Lens for Tailwind: Tail Lens is an in-browser Tailwind editor, unrelated to test coverage.
- Undercover for Ruby vs Automock: Automock simplifies unit testing for TypeScript, not Ruby coverage verification.
Undercover for Ruby FAQ
How do I pay?+
Payments are handled via Gumroad and accept major credit cards and PayPal; you can modify or cancel anytime.
Is there a free tier for open source?+
Yes, the service is free for public repositories and open-source maintainers.
Which languages and SCMs are supported?+
Undercover is a GitHub-only integration that supports all Ruby and Ruby on Rails projects.
Do I need to give Undercover access to my code?+
It requires read-only repository metadata and contents plus read/write permission for GitHub Checks.
Can I get an annual subscription discount?+
Annual billing provides a 10 % discount compared to the monthly plan.
Summarized by DevHunt from undercover-ci.com · Sep 27, 2026. Details may change; check the official site.
