VoxFlip | Reverse Voice Recorder With Audio Effects, Import, Export and IAP - SwiftU

VoxFlip | Reverse Voice Recorder With Audio Effects, Import, Export and IAP – SwiftUI

VoxFlip is a complete, production-ready iOS voice recorder template built entirely with SwiftUI. Record your voice, play it back normally or instantly reversed, and transform it with a real-time audio effects engine: chipmunk, demon, robot, cave echo, hall echo and room reverb presets, plus manual speed, pitch, reverb, distortion and echo controls. Import audio files, export clean recordings, and monetize with a one-time in-app purchase paywall. No backend, no API keys, no accounts.

Demo Instructions

This app runs fully offline for its free features. There is no login and no demo account needed. Simply build and run the project in Xcode on an iOS 17+ simulator or device, complete the 3-page onboarding (or skip it), tap Record, then Play or Reverse Play.

Note on the premium features: Import, Export/Share and the Effects editor are gated behind a one-time StoreKit 2 purchase (product id voxflip_pro). The paywall UI renders immediately with a default $4.99 price; to test the full purchase flow, configure the product in App Store Connect or attach a StoreKit configuration file (step-by-step instructions are in the included documentation).

Everything the App Does

• 3-page onboarding flow – welcome, how-to-use and free vs premium comparison pages with a hero image and animated transitions
• Voice recording – high quality AAC recording (44.1 kHz, mono) with live duration timer and a full-width record/stop button
• Normal playback – instant playback of the current recording through a real-time AVAudioEngine graph
• Reverse playback – true audio reversal at the PCM sample level with an in-memory cache, so repeated reverse plays start instantly
• 7 preset effects – Chipmunk, Demon, Robot, Cave Echo, Hall Echo, Small Room and Large Hall, with visual selection state and Reset
• Manual effect controls – playback speed (0.5x to 2x quick buttons), pitch shift (-2000 to +2000 cents slider), reverb wet/dry mix, distortion wet/dry mix, echo mix and delay time sliders, all applied live via AVAudioUnitTimePitch, AVAudioUnitReverb, AVAudioUnitDistortion and AVAudioUnitDelay
• Volume normalization – quiet takes are automatically normalized for consistent playback loudness
• Audio import – import MP3, M4A, WAV, AAC, AIFF and CAF files through the native document picker with security-scoped resource handling and automatic format conversion (sample rate and mono-to-stereo)
• Export and share – clean, effects-free export of original recordings via the native share sheet (AirDrop, Messages, Mail, Files and more)
• Recordings library – SwiftData-backed list with date formatting, duration badges, tap-to-load, inline Play and Reverse buttons, swipe-to-delete that also removes the audio file from disk
• One-time purchase paywall – animated full-screen StoreKit 2 paywall with shake animation, feature checklist, purchase progress state, close-button cooldown and restore purchases support
• Receipt-backed premium state – entitlement checks against Transaction.currentEntitlements with automatic transaction listening and revocation handling, persisted with SwiftData
• iCloud sync – CloudKit-backed SwiftData container with automatic retry and graceful fallback to local storage when iCloud is unavailable
• Settings screen – System/Light/Dark theme picker, Unlock PRO row with purchased state, Restore Purchases, Rate App, Contact Us, Terms of Use, Privacy Policy and a More Apps cross-promotion section
• Smart rating prompt – SKStoreReviewController rating request after 5 app sessions (once per user)
• Dark mode – full light and dark appearance support through a named-color design system

Technology

• SwiftUI + SwiftData (models, queries, persistence)
• AVFoundation: AVAudioEngine, AVAudioPlayerNode, AVAudioUnitTimePitch, AVAudioUnitReverb, AVAudioUnitDistortion, AVAudioUnitDelay, AVAudioRecorder, AVAudioPlayer, AVAudioConverter, AVAudioPCMBuffer
• StoreKit 2 (one-time non-consumable purchase, transaction listener, restore)
• CloudKit (optional iCloud sync with local fallback)
• SwiftUI color asset design system (light and dark variants)
• iOS 17.0+, iPhone only, portrait
• Zero third-party dependencies – pure Apple frameworks

What the Buyer Gets

• Complete Xcode project with all Swift source code (VoxFlip.xcodeproj)
• App icon and full image asset catalog
• Buyer documentation with embedded screenshots (documentation.html)
• Clear, commented architecture: AudioManager and AudioEffectsManager wrap all audio processing, so no audio expertise is required
• Ready-made monetization: one-time IAP paywall you can re-price and re-brand in minutes
• Named-color design system – re-skin the whole app by editing color values in Assets.xcassets

Development Disclosure

Portions of this template’s source code were developed with AI-assisted tools and subsequently reviewed, tested and refined by the author.

Please Note

This is a source code template, not a finished App Store app. Buyers need a Mac with Xcode 15+, basic Xcode knowledge and an Apple Developer account (for device testing, App Store submission and configuring the in-app purchase). No backend or paid service is required.