True Lock Tuner
Production iOS guitar tuning and practice application designed, built, shipped, and maintained for the App Store.
Swift • SwiftUI • AVFoundation • StoreKit 2 • RevenueCat • TelemetryDeck
Product Overview
True Lock Tuner is a native iOS application that combines real-time guitar tuning, chord recognition, a configurable metronome, alternate tunings, and advanced practice tools in a single application. I own the product across design, development, testing, monetization, analytics, App Store deployment, and post-launch iteration.
Engineering Challenges
The core tuner requires continuous microphone input to be converted into useful, responsive feedback without creating a noisy or unstable user interface.
The application also manages multiple interactive tools, free and Pro feature states, audio behavior, purchase entitlements, and asynchronous application workflows while maintaining a simple interface for the user.
What I Built
- Real-time microphone-based pitch detection and tuning feedback using AVFoundation.
- Live chord recognition based on incoming audio.
- Configurable metronome with multiple time signatures and subdivisions.
- Tempo Trainer and Gap Click practice modes.
- Alternate guitar tunings and reusable tuning configuration.
- Free and premium application states with one-time Pro monetization.
- StoreKit purchase, entitlement, and purchase-restoration workflows.
- Privacy-focused analytics across important product workflows.
Architecture & Technical Decisions
The application uses state-driven SwiftUI architecture with reusable components and clear separation between interface state, audio processing, application logic, and premium feature access.
I use asynchronous workflows where appropriate and structure features so that individual tools such as the tuner, metronome, chord recognition, and premium functionality can evolve without requiring large changes across the rest of the application.
Testing & Release
True Lock Tuner is tested in the iOS Simulator and extensively on physical iPhone hardware, particularly for features that depend on microphone input, audio behavior, StoreKit purchases, and device-specific interaction.
I manage the full production release process including build validation, StoreKit testing, App Store Connect configuration, privacy disclosures, App Review submission, release management, and post-launch updates.
Post-Launch Development
The application continues to evolve after release. I use product analytics, testing, and real-world usage to identify improvements, refine existing workflows, and prioritize new features while maintaining the stability of the production application.