Celestis
Your Private AI Assistant
Free · Designed for iPad. Not verified for macOS.
Celestis: Private AI for Your Documents
Your Knowledge. Your Data. Your AI.
Celestis is an intelligent AI platform built for professionals who demand accuracy, privacy, and the freedom to work anywhere. Whether you're on a factory floor, aboard an aircraft, in a maintenance bay, or off the grid, Celestis brings full AI power to the edge and even completely offline.
Celestis doesn't just chat. It understands your documents, learns from your knowledge, and delivers near 100% accurate, sourceable answers powered by an Adaptive-RAG engine.
AI to the Edge: Offline. Anywhere. Always.
Celestis Mobile supports on-device AI powered by Apple intelligence, letting you take your AI-powered knowledge completely offline. Get instant, accurate answers no matter where you are.
- Maintenance technicians accessing service manuals in remote facilities
- Factory workers querying procedures on the shop floor
- Airline crews referencing documentation at 35,000 feet
- Field engineers troubleshooting without a data connection
Your knowledge travels with you. No Wi-Fi. No cell signal. No problem.
Private Capsules: Your Data, Your Environment
Capsules are the heart of Celestis. Each one is a self-contained, domain-specific AI built from your own documents. Private Capsules go further, running entirely in your environment for total data sovereignty.
- Upload PDFs, Word docs, spreadsheets, presentations, CSVs, images, Markdown, and more
- Combine Capsules into Pods for cross-domain AI with intelligent routing
- Add custom instructions and guardrails per Capsule or Pod
- Schedule automatic re-ingestion to keep your AI current
Celestis never trains on your data. Your documents are never shared or retained beyond what you authorize.
Choose Your AI Provider: Zero Vendor Lock-In
Celestis ships ready to use with leading AI models, no API key required or bring your own.
- Built-in: Celestis, ChatGPT, Claude, Grok
- Open source: Any OpenAI-compatible endpoint
- Local LLMs: Ollama and any locally-run model for complete privacy with zero cloud dependency
Mix and match providers per Capsule.
What Sets Celestis Apart
- Near 100% Accuracy: Adaptive-RAG blends semantic and keyword search so every answer is precise and sourceable
- On-device AI with Apple Intelligence
- Powered by Apple Silicon in the cloud and green datacenters
- Reader Mode: Read documents while asking questions in a seamless split view
- Super AI: Augment Celestis with your Capsules to create a personalized AI that knows your domain
- Simple Credit Pricing: No token math. Credits per action type, in the app or via API
- Replicas Marketplace: Publish your Capsules, earn credits when others use your knowledge, creators keep 70%
- Connectors: Source knowledge from Gmail, Google Drive, Notion, Slack, or any REST API
Key Features
- Chat with Celestis AI, always free to start
- Domain-specific AI Capsules built from your documents
- Offline AI Bundles for full AI access with no internet
- Private Capsules running entirely in your environment
- Audio Conversations and Text-to-Speech
- Bring Your Own Model: ChatGPT, Claude, Grok, Ollama, and more
- Capsule Collections with intelligent cross-domain routing
- Reader Mode for side-by-side document reading and querying
- Image generation and transformation
- Live search and deep research
- Connectors that connect to your MCP Servers, providing limitless data sources
- Team collaboration with shared Capsule pools
- Full API access for custom integrations
- Analytics for Capsule performance, credit spend, and replica earnings
Terms of Service: https://celestis.ai/terms-of-service
Privacy Policy: https://celestis.ai/privacy-policy
- Light and Dark mode
- Microphone and Text-to-Speech support
- Audio Conversations
- Live scores, weather and finance dashboards
The developer, Celestis Ai Inc, 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 Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Celestis Ai Inc
- Size
- 3.2 GB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Profanity or Crude Humor
Mature or Suggestive Themes
Horror/Fear Themes
Medical Treatment information
Alcohol, Tobacco, Drug Use or References
Simulated Gambling
Sexual Content or Nudity
Guns or Other Weapons
Contains
Health or Wellness Topics
- Copyright
- © Celestis AI Inc.