Advanced static analysis for automatically finding runtime errors in JavaScript code, free for Open Source
DeepSource continuously analyzes source code changes, finds and fixes issues categorized under security, performance, anti-patterns, bug-risks, documentation and style. Native integration with GitHub, GitLab and Bitbucket
An online tool that performs static analysis for C/C++ code using open source tools such as cppcheck and clang-tidy and automatically generates code documentation for users using doxygen. This tool is free for use
A complete workflow to write, review and deploy code), free account for 1 user and 1 repository with 100 MB of storage
Live interactive cross-browser testing, free only 3 minutes sessions with MS IE 9 under Vista at 1024 x 768 resolution
Automated code reviews for PHP, Python, Ruby, Java, JavaScript, Scala, CSS and CoffeeScript, free for unlimited public and private repositories
Automated Code Review Platform available for many languages. Free forever for public repositories with Slack & E-mail integration
Automated code review, free for Open Source and unlimited organisation-owned private repos (up to 4 collaborators). Also free for students and institutions
Code coverage tool (SaaS), free for Open Source and 1 free private repo
Automated Code Review for Git. Free version includes unlimited users, unlimited public repositories and 1 private repo
CodeScene prioritizes technical debt based on how the developers work with the code and visualizes organizational factors like team coupling and system mastery. Free for Open Source
Display test coverage reports, free for Open Source
5 free analysis report for web performance, accessibility, security each month
DeepCode finds bugs, security vulnerabilities, performance and API issues based on AI. DeepCode's speed of analysis allow us to analyse your code in real time and deliver results when you hit the save button in your IDE. Supported languages are Java, C/C++, JavaScript, Python, and TypeScript. Integrations with GitHub, BitBucket and Gitlab. Free for open source and private repos, free up to 30 developers
EverSQL - The #1 platform for database optimization. Gain critical insights into your database and SQL queries, auto-magically
Gerrit code review for GitHub repositories for free
Code coverage for any package
Code Quality for Go projects, free for Open Source
Reports and thorough recommendations to optimize websites
The #1 static code analyzer for Postgresql optimization. Performance, security, and architect database issues automatic detection service
Comments on GitHub commits about code quality, free for Open Source
Imgbot is a friendly robot that optimizes your images and saves you time. Optimized images mean smaller file sizes without sacrificing quality. It's free for open source
Static Code Analysis for Perl with integration for GitHub. Free for unlimited public repositories
reSmush.it is a FREE API that provides image optimization. reSmush.it has been implemented on the most common CMS such as Wordpress, Drupal or Magento. reSmush.it is the most used image optimization API with more than 7 billions images already treated, and is still Free of charge
Code Quality for PHP/Symfony projects, free for Open Source
Continuous security analysis for Java, Python, JavaScript, TypeScript, C#, C and C++, free for Open Source
Code review for GitHub repositories, free for public or personal repos
Abstract syntax tree parsers and intermediate representation compilers as a service
Static code analysis for Java, C/C++, C# and JavaScript, free for Open Source
Continuous inspection platform, free for Open Source
Quality metadata badges for open source projects
Code review platform for many languages. Supports integration with GitHub. Free for public repositories with unlimited users
Automated source code analysis for Java, JavaScript, C/C++, C#, VB.NET, PHP, Objective-C, Swift, Python, Groovy and even more languages, free for Open Source
Automated Code Review and Team Analytics. Free for Open Source and organizations up to 5 collaborators
Typo CI reviews your Pull Requests and commits for spelling mistakes, free for Open Source
SEO tools but with also code verifications and different type of advices
Fix the performance of your web sites, detailed analysis