Skylight is an app that helps users identify reasons for slow performance, offering insights to improve app speed.

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  • Launch Skylight directly from your Dock or taskbar.
  • Work without distractions in a dedicated window, separate from your browser tabs.
  • Stay signed in to multiple Skylight accounts and switch between them without logging out.

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For developers maintaining Ruby and Rails applications, Skylight helps pinpoint slow requests and decide which performance issues to tackle first. It collects and organizes app performance data, ranking endpoints by a combination of how often they run and how slow they are, so frequently used problem areas are easier to spot. Explore endpoint timelines to see where time is spent, inspect aggregated SQL activity, and trace events to source-code locations. Skylight also highlights potential issues such as repeated queries and high object allocations. Deploy markers and performance trends help compare changes over time, while endpoint response-time distributions can reveal occasional slow requests that averages might hide. It supports Rails and other Ruby frameworks, including Sinatra and Grape, and provides performance monitoring for background jobs such as Sidekiq, DelayedJob, and ActiveJob.

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