Profiler for your development and production Ruby rack apps.
For a quick ad hoc peek at the performance of pages that you can request yourself, without having to go through the hoops of connecting to and committing to an external service, this gem can also be useful: https://github.com/MiniProfiler/rack-mini-profiler
Identify database issues before they hit production.
Start with finding mixing indexes: https://github.com/gregnavis/active_record_doctor
Clean code begins in your IDE with SonarLint. Up your coding game and discover issues early. SonarLint is a free plugin that helps you find & fix bugs and security issues from the moment you start writing code. Install from your favorite IDE marketplace today.
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