Voxio | Offline Text to Speech Reader With Voice Library, Notes and Audio Export - SwiftUI

Voxio – Offline Text to Speech for iOS

Voxio is a complete, App Store ready text to speech template built with SwiftUI. Turn any text, PDF, RTF or TXT document into natural sounding speech entirely on device – no server, no API keys, no monthly API costs. It ships with two free voices bundled, 90+ additional voices available for download, a notes library with iCloud sync, audio file playback, m4a export and a full StoreKit 2 paywall.

Demo Instructions

• No login and no demo credentials are needed – the app is 100 percent offline.
• Launch the app, complete the onboarding, type or paste any text and tap Play to hear it spoken aloud with the bundled voice.
• Two voices (Amy and John, US English) are bundled and work instantly. All other voices can be downloaded on demand from the Voice screen.
• Text to speech is free for the first 3 plays, then the premium paywall appears. Audio export requires an active subscription.
• Note: In-app purchases require your own App Store Connect products. Without configured products the paywall shows placeholder pricing, and the free play limit applies. To test everything without limits you can mark a user as subscribed in code (shown in the documentation).

Everything the App Does

• - Convert typed, pasted or imported text into natural speech, fully offline on device
• - 2 free voices bundled with the app (US English, male and female)
• - 90+ high quality voices in 20+ languages, downloadable on demand with size shown before download
• - Voice screen with accent/language filter chips, flags, gender, quality labels and audio sample previews
• - Live sentence highlighting during playback so you can follow along
• - Playback speed control: 0.5x, 0.75x, 1x, 1.25x, 1.5x, 2x
• - Skip forward and backward between sentence chunks during playback
• - Progress slider with elapsed and total time
• - Background audio playback – keeps reading with the screen locked
• - Smart text preprocessing: dates, version numbers and common abbreviations are spoken naturally
• - Import text from PDF (multi-page, chunked for large files), TXT and RTF files
• - Import text from pictures using on-device OCR (Vision framework)
• - Import and play m4a audio files with a queue, seek slider and skip controls
• - Import text from other notes in the library
• - Save notes to a personal library with titles and timestamps
• - Notes library with edit, delete confirmation and animated removal
• - Export any note to an m4a audio file using the selected voice (premium)
• - Share exported audio via the system share sheet
• - iCloud sync of notes and preferences via SwiftData + CloudKit, with automatic local fallback
• - StoreKit 2 paywall: 3 free text to speech plays, then unlock with a subscription
• - Premium paywall screen with yearly plan, monthly plan with 3-day free trial toggle, restore purchases and manage subscriptions
• - Onboarding flow with 3 pages explaining the app, how to use it and free vs premium
• - Appearance switcher: System, Light and Dark mode
• - Toast notifications for every action (saved, imported, exported, errors)
• - Import progress indicator with percentage for large PDF files
• - Automatic rating prompt after 5 sessions (SKStoreReviewController)
• - Custom tab bar with Playback, Library and Settings sections
• - Empty states, error alerts and polished dark navy / blue design system

Technology

• - Swift 5, SwiftUI, iOS 17.0+
• - SwiftData for notes and preferences persistence
• - CloudKit (NSPersistentCloudKitContainer style automatic sync) with local fallback
• - sherpa-onnx + ONNX Runtime (bundled xcframeworks) for offline neural TTS (Piper models)
• - PDFKit for PDF text extraction
• - Vision framework for on-device OCR
• - AVFoundation for playback, audio sessions and m4a export
• - StoreKit 2 for subscriptions and trials
• - SWCompression Swift package (auto-resolved by Xcode)

What the Buyer Gets

• - Full Xcode project source code (SwiftUI)
• - Two bundled TTS voice models ready to speak out of the box
• - All graphics, app icon and design assets
• - Step by step documentation with screenshots (setup, rename, icon, theme, App Store submission)
• - Item description, preview image and reviewer message files

Development Disclosure

Portions of this template’s source code were developed with AI-assisted tools. All code has been reviewed, tested and verified to build and run as described.

Closing Note

This item is a source code template for the Xcode project. Basic Xcode and Apple developer account knowledge is required to build, customize and publish the app. Support for configuration questions is available through the comments page.