# Celestis — Your Private AI Assistant

> Private AI assistant for professionals, offering offline document analysis and custom knowledge models. (iPhone/iPad app by Celestis Ai Inc.)

- Source: https://appshunter.io/ios/app/celestis/id6781116681 (this page in markdown: same URL + `.md`)
- Developer: [Celestis Ai Inc](https://appshunter.io/developer/6781116683)
- Category: Productivity, Business
- Price: Free
- Rating: 5.00/5 from 4 App Store ratings · 3 written reviews indexed
- Age rating: 12+
- Requires: iOS 26.0 · 3.0 GB
- Languages: American English
- Released: 2026-07-12
- Data updated: 2026-08-22
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/celestis/id6781116681/reviews.md

## What is Celestis?

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
- 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
- Web 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

## Key features

- On-device AI with Apple Intelligence
- Offline AI capabilities
- Private Capsules for custom AI models
- Support for multiple AI providers
- Near 100% accurate, sourceable answers
- Document ingestion from various formats

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/celestis/id6781116681/reviews.md

### 5/5 — Great experience

*2026-08-16*

Easy and intuitive to use. Highly appreciate the privacy factor.

### 5/5 — Amazing offline mode

*2026-08-09*

I have tried other platforms and nothing beats this for offline mode for AI.

### 5/5 — Amazing offline mode

*2026-07-14*

I loved the offline document AI. The results were amazing and being able to not only get great answers but also read the pages and flip through document was next level!

## Frequently asked questions about Celestis

### What is Celestis?

Celestis is a private AI assistant designed for professionals to analyze documents and access knowledge. It offers on-device AI capabilities, allowing for offline use and ensuring data privacy.

### Can I use Celestis offline?

Yes, Celestis offers offline AI bundles that provide full AI access without an internet connection. This is ideal for professionals working in remote facilities or off the grid.

### How does Celestis handle my data privacy?

Celestis prioritizes data sovereignty. Private Capsules run entirely within your environment, and the platform never trains on your data or shares it without authorization.

### What types of documents can I upload to Celestis?

You can upload a wide variety of document types, including PDFs, Word documents, spreadsheets, presentations, CSVs, images, and Markdown files.

### Does Celestis have ads?

No, Celestis does not contain advertisements. The app is free to start and offers a premium experience without interruptions.

### What AI providers does Celestis support?

Celestis supports multiple AI providers, including built-in options like Celestis and ChatGPT, open-source models, and local LLMs via Ollama for complete privacy.

### How accurate are the answers provided by Celestis?

Celestis aims for near 100% accuracy with its Adaptive-RAG engine, which blends semantic and keyword search. This ensures that every answer is precise and sourceable.

### What devices is Celestis available on?

Celestis is available on iPhone and iPad devices, leveraging Apple Intelligence for on-device AI processing.

## Version history (last 3 releases)

### 1.1.3 — 2026-08-19

- In chat enter "@" to switch between capsules
- Faster, improved text streaming
- UI improvements, more area for text

### 1.1.2 — 2026-08-09

New Features:
- Improved Navigation with introduction of "/" slash commands
- Live Web Search & Deep Research
- New content sources display for News, Finance, Sports and Weather related inquiries

### 1.1.1 — 2026-07-12

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*