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Skylight

Don’t struggle to learn why your app is slow. Get answers with Skylight.·skylight.io

Skylight is a performance profiler for Ruby and Rails applications that turns performance data into actionable insights. It sorts endpoints by an 'agony' score combining slowness and popularity to highlight where developers should focus optimization efforts. It tracks deploys against performance graphs, monitors background job queues (Sidekiq, DelayedJob, ActiveJob), and provides SQL, event-sequence, and timeline analysis tools. It is offered free for open-source applications.

What it's for

Diagnosing why a Rails app is slowIdentifying the highest-impact endpoints to optimizeTracking performance before and after deploysDetecting hidden performance issues in background job queuesFinding allocation hogs and repeated queriesAnalyzing SQL queries behind slow eventsMonitoring GraphQL query performanceCommunicating performance trends to stakeholders via weekly reports

Features 18

Aggregated, sanitized SQL analysis
Background job monitoring (Sidekiq, DelayedJob, ActiveJob)
Deploy tracking overlaid on performance graphs
Endpoint exploration with sort, filter, and search
Endpoint sorting by 'agony' (slowness + popularity)
Event sequence graphs showing bottleneck locations
Featherweight agent written in Rust
Frog boils (six-week performance decline detection)
GraphQL query support in dashboard
Mistake detection for allocation hogs and repeated queries
Most improved endpoints tracking
Response time distribution histograms
Separation of response types (html, json, errors)
Slowdown warnings
Source location tracing down to line number
Support for multiple Ruby frameworks (Rails, Sinatra, Grape)
Timeline filter to compare fastest vs slowest responses
Weekly trends reports

At a glance

free tierfree trial

TypeWeb app

DeploymentCloud

PlatformsWeb

ForRuby developers, Rails developers, open source app maintainers

CompanyTilde Inc.

Integrations

RailsSinatraGrapeSidekiqDelayedJobActiveJobGraphQLGitHub

Pricing

Pricing is usage-based on monthly request/trace volume via an interactive calculator; no fixed dollar amounts per tier are stated. Volume pricing available by contacting the company via email. Free for open source apps.

Open SourceFree

Skylight is free for open source applications.

Free for open source apps

Standard (usage-based tiers)Quote

Page provides an interactive cost estimator based on monthly requests; no fixed numeric prices are shown in the supplied text.

Based on monthly request/trace volume

Volume/CustomQuote

Quote-based for higher-volume needs.