LMBox - Private Offline AI
All Data Processed On-Device
Free
Private AI chat, writing, voice transcription and PDF Q&A—all on-device. No account or cloud AI uploads. Download models once, then work offline.
Your private AI assistant. All data processed on-device.
Chat, ask questions, write, and explore ideas on your iPhone or iPad. LMBox runs language models directly on your device. AI chat, recording transcription, text recognition, and PDF Q&A are processed locally, without an account or sending your conversations, recordings, photos, or files to cloud AI. Download the required models first, then keep working offline.
ON-DEVICE AI CHAT
Choose a model that fits your device for text Q&A, drafting, and brainstorming. Stream replies, stop generation, and save or search your conversation history.
TRANSCRIBE RECORDINGS, THEN ASK
Record, pause, save, preview, and replay audio. Transcribe recordings on-device, keep the text with your conversation, ask follow-up questions, or run recognition again.
ASK ABOUT PDFs AND SCANNED TEXT
Add PDFs, scanned PDFs, photos, and text files. View original attachments, processing progress, and the full extracted text. Find relevant passages and PDF page numbers based on your questions.
MANAGE YOUR PERSONAL CONTENT
View local storage and separately remove personal content, caches, chat models, or speech recognition resources. No account, ads, or third-party product analytics.
BEFORE YOU START
The interface supports English, Simplified Chinese, and Traditional Chinese. Switch the app language in system settings; existing conversations and original files remain unchanged. Chat models and the initial speech recognition resources of about 1 GB require an internet connection and sufficient storage to download. Once the required models are ready, processing works offline. Performance and available models depend on your device resources.
Photos support text recognition only, not visual scene understanding. Each PDF supports up to 200 pages or 1 million characters, with the extracted range shown in the app. Questions about long material remain subject to model context limits. Recognition and AI responses can be incorrect; check the original sources.
Personal content uses system file protection. System backups depend on your device settings. On-device processing does not imply additional app-level end-to-end encryption.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Updated the App Store description and feature information to clarify on-device AI chat, transcription, and PDF Q&A.
The developer, 伟杰 袁, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 伟杰 袁
- Size
- 33.5 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later.
- iPhone
- Languages
English and 2 more
- English, Simplified Chinese, Traditional Chinese
- Age Rating
13+
- 13+
- Infrequent
Cartoon or Fantasy Violence
Realistic Violence
Profanity or Crude Humor
Mature or Suggestive Themes
Horror/Fear Themes
Medical Treatment information
Alcohol, Tobacco, Drug Use or References
Sexual Content or Nudity
Guns or Other Weapons
Contains
Health or Wellness Topics
- Copyright
- © 2026 oldbone