Sine: Audiobook Player MP3/M4B
Listen offline, sleep timer
Free · Designed for iPhone. Not verified for macOS.
Meet Sine, your personal audiobook player. Import MP3 and M4B files, listen offline, and skip silent gaps with Skip Silence (beta). No ads.
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.
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!
The developer, Dallen Burwell, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dallen Burwell
- Size
- 7.9 MB
- Category
- Books
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Dallen Burwell