Codecov

Codecov is a code coverage testing and insights platform that helps engineering teams ship better code without slowing down. It uses AI to generate unit tests, delivers immediate and detailed pull-request feedback with code suggestions, and shows exactly which lines failed which tests so teams can quickly re-run or skip flaky tests. Codecov also tracks JavaScript bundle size changes directly in pull requests and enforces size or percentage-increase limits to prevent problematic merges. The platform integrates with the majority of programming languages, CI tools, and code hosts, giving teams a single place to analyze coverage, risk, and code quality. Codecov was acquired by Sentry in 2022 and later acquired from Sentry by Harness in 2026.