Help

Setup walks you through your explanation language, AI service, voice and subscriptions. You can skip a step and finish it later. With subscriptions, Feeds comes first; otherwise, Library does. Change this in Me → Settings → Open on launch.

Double-tap a word for an inline meaning, then tap the meaning to open its card. Hold to select text for lookup, paragraph translation, a note or copying.

Setup guides you through connecting your own service. Choose DeepSeek, OpenAI or a compatible provider, and enter your API key. Review the content-sharing permission before connecting. Your key is saved only on this device, never on Sidelit servers. You can change the service later in Me → Settings → AI services. Basic reading and the prepared sample meanings work without AI. Your provider charges for model usage.

Unencrypted EPUB, PDF, TXT and Markdown are supported, along with some older MOBI files. Scanned PDFs retain their original layout; pages without a text layer cannot use lookup or translation.

Play pronunciation beside the original text in a card. Choose American or British English, a voice and a speed in Speech and pronunciation. Recognition and pronunciation run on device. Prepare voice resources during setup or download them when needed. Existing downloads are reused and work offline.

Keep looked-up expressions for review at the end of a chapter. Notes stay linked to their source. Export a complete backup or restore one in Me → Settings → Data and sync. Restore only adds missing records; it does not replace local content. Store backups safely: they include passages, notes and conversations.

Books, subscriptions, word notes, notes, conversations and progress are not stored on Sidelit servers. Data stays on your device and, when iCloud sync is enabled, in your own private iCloud storage. When you use AI, relevant content goes directly to your chosen provider.

Saved expressions, quoted passages and notes are preserved independently where available. Returning to a removed source may no longer be possible. You can manage or remove the learning records separately.

Include your app version, iPhone model, steps to reproduce and any necessary screenshots. Do not send API keys or unnecessary books and private notes.