# Sine: Audiobook Player MP3/M4B — Listen offline, sleep timer > Advanced audiobook player for personal audio file collections on iOS. (iPhone/iPad app by Dallen Burwell.) - Source: https://appshunter.io/ios/app/sine-audiobook-player-mp3m4b/id6763369554 (this page in markdown: same URL + `.md`) - Developer: [Dallen Burwell](https://appshunter.io/developer/1895284074) - Category: Books - Price: Free - Rating: 4.75/5 from 4 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 8 MB - Languages: English - Released: 2026-06-17 - Data updated: 2026-09-17 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sine-audiobook-player-mp3m4b/id6763369554/reviews.md ## What is Sine? Sine is an audiobook player for iOS — built for readers who listen. Import your own MP3, M4B, M4A, FLAC, and AAC files via Files, AirDrop, WiFi upload, URL download, or share extension. Then listen with the controls audiobook readers actually want: • Variable speed (0.5×–4.0×) with per-book memory • Chapter navigation and bookmarks with notes • Sleep timer with gradual fade and shake-to-resume • Smart rewind on resume • Folders, search, and custom drag-and-drop ordering for books and folders • 10-band equalizer with presets and a custom slot • Volume boost and normalization • Gesture mode (tap zones on artwork to control playback) • Dynamic player colors (tints from the book's artwork) • Lifetime listening stats with daily, weekly, and monthly charts • CarPlay and Apple Watch remote (both in beta) • Lock screen, AirPlay, and headset buttons • Interactive playback widgets, Siri Shortcuts, Spotlight search • Full VoiceOver accessibility SKIP SILENCE (BETA) Most audiobooks contain hours of silent gaps and trailing pauses — skip them automatically and save real time over the course of a book. Tune the sensitivity to your taste, see your lifetime savings, and listen faster without missing a word. Skip Silence is in beta: turn it on and it starts automatically when you play a book. PRIVACY-FIRST No Sine account required. No ads. Your library is stored locally. Optional usage analytics help improve the app: feature events, listening-time ranges, a random installation identifier, and app and OS versions. These analytics do not include book titles, file names, or audiobook content. You can turn off usage sharing in Settings. Built from scratch with SwiftUI, AVAudioEngine, and SwiftData. Zero third-party dependencies. ## Key features - Import MP3, M4B, M4A, FLAC, AAC files - Variable playback speed - Chapter navigation and bookmarks - Sleep timer with fade - Skip Silence feature - 10-band equalizer - CarPlay and widget support ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/sine-audiobook-player-mp3m4b/id6763369554/reviews.md ### 4/5 — Editing book covers *2026-09-01* I’m loving this app so far, but would love to edit the covers **Developer response:** The latest version of the app now supports editing covers and files. Thanks for the suggestion! ### 5/5 — Ticks all the boxes *2026-08-16* this app does it all. I especially enjoy the equalizer, it is so nice to be able to roll some treble off of the narrator‘s voice at night time to make it sound a little more muffled into my ears. This app is a keeper, give it a try. **Developer response:** Glad to hear you’re enjoying the equalizer! Thanks for the review, Happy listening! ### 5/5 — I can get through a book so much faster! *2026-07-28* The feature that lets me trim out the long silences reduces the listening time by so much! I saved almost 2.5 hours using the balanced mode! **Developer response:** Glad to hear you like the app! Hope you keep saving yourself time. Happy Listening! ## Frequently asked questions about Sine ### What file formats does Audiobook Player support? Audiobook Player supports importing and playing MP3, M4B, M4A, FLAC, and AAC audio files. This allows for a wide range of personal audiobook collections to be used within the app. ### Can I listen to audiobooks offline with Audiobook Player? Yes, Audiobook Player is designed for offline listening. Once your audio files are imported via methods like Files, AirDrop, or WiFi upload, you can listen to them without an internet connection. ### Does Audiobook Player have ads? No, Audiobook Player is ad-free. The developer emphasizes a privacy-first approach, and the app does not contain advertisements, ensuring an uninterrupted listening experience. ### How does the 'Skip Silence' feature work in Audiobook Player? The 'Skip Silence' feature automatically detects and skips silent gaps and trailing pauses in audiobooks, saving you listening time. You can tune its sensitivity to your preference and see your lifetime savings. ### Is Audiobook Player available on Android devices? Currently, Audiobook Player is built for iOS devices only. It is designed to work with iPhones and supports features like CarPlay. ### What is the age rating for Audiobook Player? Audiobook Player has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions. ### How often is Audiobook Player updated? The latest version of Audiobook Player was released on August 1, 2026, with version 1.2. While specific update frequency isn't detailed, this indicates active development and recent improvements. ### Does Audiobook Player offer a free trial? Audiobook Player is completely free to download and use. There is no cost associated with accessing its features, and it does not require a subscription or offer paid upgrades. ## Version history (last 5 releases) ### 1.5.1 — 2026-09-13 We’re now Sine—a new name for your audiobook player. This update adds more ways to listen and organize your library: • Keep the app responsive while opening large audiobooks, with Skip Silence preparing audio incrementally as you listen • Control playback from CarPlay (beta), with skip controls, speed presets, and Skip Silence • Use the new Apple Watch remote (beta) for play/pause and forward/back controls • Add custom artwork to books and folders, then crop and zoom it to fit • Refresh your library to remove stale entries after files are renamed or edited • Finished books now have gray covers, muted titles, and a subtler completion badge • Fixes a crash affecting audiobooks longer than 40 hours, plus additional playback improvements Thanks for listening! ### 1.5.0 — 2026-09-02 This update makes listening and organising your library smoother: • Playback now resumes reliably after phone calls and other interruptions • Custom sorting lets you drag books and folders into exactly the order you want • Move books between folders and rearrange books inside each folder • Continue Listening widgets now include play/pause and forward/back controls • More reliable large audiobook imports and switching between books • Refined widget layouts and a refreshed App Store gallery Thanks for listening! ### 1.4.1 — 2026-08-28 This update corrects the App Store screenshot gallery. Playback and library behavior are unchanged. ### 1.4 — 2026-08-21 • Refreshed Library, listening tools, onboarding, and stats • New chapter breathing room adds a comfortable pause between chapters • Skip Silence keeps controls steady and clearly shows when a quiet moment is skipped • Book length now appears in the Library and Skip Silence details • Improved Now Playing layouts for Display Zoom and compact iPhones ### 1.3 — 2026-08-10 • New: rate Audiobook Player right from Settings • Refreshed App Store listing • Small fixes and polish under the hood ## More apps by Dallen Burwell - [Braxton Hicks](https://appshunter.io/ios/app/braxton-hicks/id6788960194) All apps by Dallen Burwell: https://appshunter.io/developer/1895284074 ## Related topics [mp3 audiobook player](https://appshunter.io/ios/topics/mp3-audiobook-player) · [m4b](https://appshunter.io/ios/topics/m4b) · [rewind talk](https://appshunter.io/ios/topics/rewind-talk) · [ohlio](https://appshunter.io/ios/topics/ohlio) · [fourth](https://appshunter.io/ios/topics/fourth) · [equals](https://appshunter.io/ios/topics/equals) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*