Arbiter - Local AI Chat
Private, offline AI Assistant
Free · In‑App Purchases
AI without the cloud. Run models locally on your phone, or connect to more powerful models running on your PC or Mac over your local network. Supports Gemma 4!
Arbiter is a privacy-first offline AI assistant that runs on your device. Choose from lightweight open-source models like Gemma, Llama, DeepSeek, Qwen, and Mistral, or connect to larger models running on your PC or Mac over your local network. You can also connect to Arbiter for Mac when it is serving a local model on your network. There are no accounts, servers, or data collection. All your conversations are stored securely on your device, under your control.
Key Features:
- On-Device AI: Download and run models locally on your iPhone
- Local Network Models: Connect to more powerful models running on your PC or Mac through tools like LM Studio, Ollama, or Arbiter for Mac
- Visual AI Support: Upload images or take photos in-app to use with MLX-powered visual models
- Document & File Uploads: Summarize files and extract key insights
- Optional Web Search: Access up-to-date information when needed, while keeping your core experience private and local
- Smart Chat Suggestions: Context-aware suggestions tailored to your selected model and role
- Personalization: Customize system prompts and model settings for a more tailored experience
- Privacy by Design: Your conversations and data never leave your device unless you choose to enable web search or connect to a local network model
- Model Flexibility: Choose from multiple open-source AI models to balance speed, accuracy, and memory use
- Improved Reliability: Smarter context handling and enhanced error management for a more stable experience
- No Hidden Costs: Avoid expensive cloud fees with local and local-network processing
Whether you want to brainstorm, code, proofread text, analyze images, summarize files, search the web, or experiment with the latest open-source AI, Arbiter makes advanced AI models accessible while keeping your data in your hands.
Device Requirements: For smooth on-device performance, Arbiter is recommended for iPhone 13 Pro or later, or devices with at least 6GB RAM. Older devices may experience memory issues or crashes.
New optional on-device memory helps Arbiter remember useful details.
Better answers from attached PDFs and text files.
Improved web search with clearer sources.
Share chats with others and open shared chats in Arbiter.
Copy, retry, read aloud, and share responses more easily.
The developer, Jordan Stone, 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
- Jordan Stone
- Size
- 37.4 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.4 or later.
- iPhone
Requires iOS 18.4 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.4 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Large Tip $9.99
- Medium Tip $4.99
- Extra Large Tip $19.99
- Small Tip $1.99
- Copyright
- © 2025 Jordan Stone