SwiftFairy launches: on-device Mac app that reviews your coding agent's Swift code
JordanMorgan10 · x · 2026-09-24
Nil Coalescing has released SwiftFairy, a native macOS app that gives AI coding agents local Swift/SwiftUI code review capabilities.
Workflow: you ask your agent to "review my app with SwiftFairy"; the agent sends the relevant code and declarations to the app, which analyzes the codebase entirely on-device, spotting subtle bugs, performance issues, and improper API usage, then returns structured findings with explanations, guidance, and code examples the agent uses to fix the code.
Knowledge is organized into Scrolls, each covering a set of related APIs or a domain (e.g. Proper SwiftUI, Performant Swift Charts), combining best practices, known issue patterns, and code examples. Review dimensions include API usage, lifecycle, data flow, performance, state ownership, view identity, concurrency, and collections. A one-day full free trial is offered with no card required.
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