Comparison

Parallax vs Celestis

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Parallax

This AI companion offers private, on-device assistance or connects to various cloud AI providers. It allows side-by-side response comparison, live web context retrieval, and generates charts directly in conversations. Features include voice input, file analysis, image generation, and cross-device continuity.

Highlights
  • On-device and cloud AI integration
  • Side-by-side response comparison
  • Live web context retrieval
  • In-chat chart generation
  • Cross-device conversation continuity
  • Voice input and spoken responses
  • File and photo analysis
Features
Read full description

Parallax AI is your private, flexible AI companion—available across iPhone, iPad, Mac, Apple Watch, Apple TV, and Apple Vision Pro. PERSPECTIVES Ask once, hear more. Perspectives brings together your private on-device AI and configured cloud providers in one response. See each labeled viewpoint, spot the differences, and get a balanced synthesis to help you decide with confidence. YOUR AI, YOUR CHOICE Use On-Device AI for private help on supported devices, or connect your own API keys for OpenAI, Google Gemini, xAI/Grok, Groq, Mistral, Together, Perplexity, Anthropic, or Cursor. Switch providers instantly, save your favorites, and choose the right model for everyday help, research, coding, creative work, or deep reasoning. PICK UP ANYWHERE Start a conversation on one Apple device and continue on another. Parallax keeps your recent conversations and cloud setup in sync through iCloud, so your work stays within reach—from iPhone to Apple Vision Pro. LIVE, CAPABLE, AND READY Get live web context for current questions, weather details, native charts, voice input and spoken replies, file and photo analysis, image generation, URL fetching, long-term memory, templates, and agent tools. PRIVACY FIRST On-Device AI stays on your device. Cloud requests go directly to the providers you choose using your own API keys. Incognito Mode keeps conversations out of history and memory. Free to use. No ads. No required account.

About

Celestis

This AI assistant empowers professionals with private, on-device intelligence for document analysis and knowledge retrieval. It offers offline capabilities, custom AI models built from your data, and supports various AI providers for ultimate flexibility and data sovereignty.

Highlights
  • 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
Features
Read full description

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

Screenshots

Parallax4 screens
Celestis4 screens

Verdict

The call

The clearest difference is update cadence: Parallax at every 2 days against Celestis's every 2 weeks. Parallax also leads on device support (6 vs 2). Celestis's advantage is ratings volume (4 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Parallax against 5.0 for Celestis. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Parallax ships an update every 2 days, Celestis every 2 weeks. The most recent releases landed on October 28, 2026 and October 23, 2026 respectively.

Scorecard3 real differences · 7 level
Parallax versus Celestis: the parameters behind the verdict, then further details
ParameterParallaxCelestis
PriceFreeFree
Rating5.0 (1 ratings)5.0 (4 ratings)
Positive reviews—100.0% of reviews
Number of ratings14 — better
Update frequencyEvery 2 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro — betteriPhone, iPad
Requires iOS26.026.0
Further details — not scored
Size7 MB3.0 GB
Age rating12+12+
DeveloperChris NicolaidisCelestis Ai Inc

Customer experience

Parallax

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Celestis

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Parallax

No in-app purchases

None

Celestis

No in-app purchases

Questions

Is Parallax free?
Parallax is free to download, with no in-app purchases.
Is Celestis free?
Celestis is free to download, with no in-app purchases.
Which has better reviews, Parallax or Celestis?
Parallax and Celestis are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.
Do Parallax or Celestis have ads?
Neither Parallax nor Celestis shows ads.
Which is updated more often, Parallax or Celestis?
Parallax ships an update every 2 days, and Celestis every 2 weeks. Most recently, Parallax was updated on October 28, 2026 and Celestis on October 23, 2026.

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