Compare 20 free code quality tools, free tiers, and developer deals. Verified pricing for What The Diff, Pullflow, codacy.com, Codeac.io, CodeFactor and more.
What this name holds: Static analysis, review bots and coverage reporting that read the source without running the product.
3 other names here answer “how do I check the code and the browser”, and each holds a different list: Browser Automation (5), Testing (45), Web Scraping (23).
We track 20 code quality services with free tiers. What The Diff leads with a generous free tier. This category has been mostly stable — only 1 pricing change recorded across all vendors.
| Vendor | Tier | Description | Verified |
|---|---|---|---|
| What The Diff | Free | AI-powered code review assistant. The free plan has a limit of 25,000 monthly tokens (~10 PRs). | 2026-07-31 |
| Pullflow | Free | Superseded: As of 2026-08-28, pullflow.com reads: The Free plan is $0 forever for open source projects, startups, and small dev teams. It includes unlimited public repos, unlimited public users, and 5 private-repo users. We are not publishing our stored Pullflow terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones. Read what we recorded ↓ | 2026-08-01 |
| codacy.com | Free | Automated code reviews for PHP, Python, Ruby, Java, JavaScript, Scala, CSS, and CoffeeScript — free for open source. 4 users, 7 repos on free plan. Static analysis, security patterns, duplication detection, code complexity metrics | 2026-08-13 |
| Codeac.io | Free | Automated Infrastructure as Code review tool for DevOps integrates with GitHub, Bitbucket, and GitLab (even self-hosted). In addition to standard languages, it also analyzes Ansible, Terraform, CloudFormation, Kubernetes, and more. (open-source free) | 2026-08-02 |
| CodeFactor | Free | Automated Code Review for Git. The free version includes unlimited users, public repositories, and one private repo. | 2026-08-05 |
| coderabbit.ai | Free | AI-powered code review tool for GitHub/GitLab/Bitbucket. Free tier: basic PR summarization and reviews in IDE on unlimited public and private repositories, with a 14-day Pro trial included (no credit card). Paid Pro is $24/user/month billed annually and adds detailed reviews with 5 reviews/hour; Pro Plus adds 10 reviews/hour. Free-for-open-source may still apply but is no longer prominently featured on the pricing page. | 2026-08-26 |
| CodSpeed | Free | Automate performance tracking in your CI pipelines. Catch performance regressions before deployment, thanks to precise and consistent metrics. Free forever for Open Source projects. | 2026-08-07 |
| coveralls.io | Free | Test coverage tracking — displays coverage reports with line-by-line detail, PR comments, and badge embeds. Free for open source repos with unlimited public repos. Supports 22+ languages | 2026-08-13 |
| deepscan.io | Free | Advanced static analysis for automatically finding runtime errors in JavaScript code, free for Open Source | 2026-08-02 |
| DeepSource | Free | DeepSource continuously analyzes source code changes, finding and fixing issues categorized under security, performance, anti-patterns, bug-risks, documentation, and style. Native integration with GitHub, GitLab, and Bitbucket. | 2026-08-04 |
| DiffText | Free | Instantly find the differences between two blocks of code. Completely free to use. | 2026-08-03 |
| goreportcard.com | Free | Code Quality for Go projects, free for Open Source | 2026-08-02 |
| gtmetrix.com | Free | Website performance testing — Lighthouse-based reports with Core Web Vitals, waterfall charts, and optimization recommendations. Free account: testing from Seattle and London, dashboard with filters and tags, daily/weekly/monthly monitoring, e-mail alerts, and 1-month CrUX history. GTmetrix states no on-demand test or monitored-slot quantity for the free account; the cheapest paid plan (Lite, $5.99/mo) lists 50 monthly on-demand tests and 1 monitored slot. | 2026-08-17 |
| holistic.dev | Free | The #1 static code analyzer for Postgresql optimization. Performance, security, and architect database issues automatic detection service | 2026-08-04 |
| houndci.com | Free | Comments on GitHub commits about code quality, free for Open Source | 2026-08-02 |
| reviewable.io | Free | Code review for GitHub repositories, free for public or personal repos. | 2026-08-04 |
| scan.coverity.com | Free | Static code analysis for Java, C/C++, C# and JavaScript, free for Open Source | 2026-08-28 |
| scrutinizer-ci.com | Free | Continuous inspection platform, free for Open Source | 2026-08-05 |
| semanticdiff.com | Free | Programming language aware diff for GitHub pull requests and commits, free for public repositories | 2026-08-06 |
| tickgit.com | Free | Surfaces `TODO` comments (and other markers) to identify areas of code worth returning to for improvement. | 2026-08-04 |
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