Listen to Books with iPhone Screen Off

iOS has a rule: when the user locks the screen, apps are expected to stop doing work and go to sleep. This saves battery and prevents apps from running in the background without your knowledge. Audio is the main exception. An app can ask iOS for permission to keep playing audio while the screen is off or another app is in front. The developer adds a key to the app's configuration file (the UIBackgroundModes entry with the value "audio"), and iOS grants the permission.

Many apps that happen to read text aloud were not built as audio players. A notes app, a PDF viewer with a TTS feature bolted on, or a browser that reads articles might not have the background audio declaration. When you lock the screen, the audio stops because iOS suspends the app, and the developer never asked for the audio exception.

The fix is not something you can do as a user. The app has to declare the mode in its build. If screen-off listening matters to you, check whether the app supports it before relying on it.

When LoudReader is playing, the lock screen looks similar to the music player, with book-specific information:

• Book title and author. Extracted from the EPUB or PDF metadata, shown at the top of the playback widget.
• Elapsed time and progress bar. Shows how far into the book or chapter you are. You can scrub forward and backward by dragging the progress bar.
• Play/pause button. The standard center button. Tap to pause, tap again to resume.
• Skip forward and skip back. Jumps 15 seconds in either direction. Useful for revisiting a sentence you missed or skipping ahead past a section you already know.

These same controls work from Bluetooth devices. If your headphones have a play/pause button, it controls LoudReader playback. If your car stereo has track-skip buttons, they trigger the 15-second skips. This is standard iOS media control behavior, and LoudReader implements the system's media player interface so these controls work the same way they do for music and podcasts.

iOS has a system-wide feature called Speak Screen. Swipe down with two fingers from the top of the screen, and iOS reads whatever is on the screen aloud. It works in any app, and it sometimes continues with the screen locked.

The honest experience: Speak Screen was not designed for screen-off listening. The voice is the system accessibility voice (a single voice for everything), the reading stops unpredictably when you switch apps or receive notifications, and there are no lock-screen playback controls. You cannot pause from the lock screen, skip back, or see which book you are listening to. For a short passage in an app that lacks its own TTS, Speak Screen is fine. For a book or a long article you want to listen to with the phone in your pocket, an app built for screen-off listening is the right tool.

Yes, and the difference is significant. On most iPhones, the display is the single biggest power draw. When the screen is on at full brightness, it can consume several watts. When the screen is off, that draw goes to near zero.

LoudReader's voice generation runs on the Neural Engine, a specialized part of the Apple Silicon chip that is designed for machine learning tasks and is very power-efficient. On a fully charged iPhone, you can expect many hours of screen-off listening before the battery runs low. The exact number depends on the iPhone model, battery health, and whether other apps are running in the background.

If you listen while exercising, commuting, or doing chores, screen-off playback is the mode that makes the most sense. Set up the book, pick the voice, press play, lock the screen, and put the phone away. Listening while driving covers the setup for a specific use case where screen-off and hands-free are essential.

Most apps do not advertise this in their App Store description, which is frustrating. Here is how to check:

1. Download the app (preferably a free one, or a free trial).
2. Import a short text or sample book and press play.
3. Lock the screen. If playback stops within a second or two, the app does not support background audio.
4. If playback continues, unlock the screen and check the lock screen: are the title and playback controls visible? If yes, the app has proper background audio support.

This is the only reliable test. App Store descriptions can say "plays in the background" and still mean different things to different developers. Lock the screen and see for yourself.

If you want an app you know passes this test out of the box, LoudReader is built for it. Background audio is not a side feature. It is the core playback model.