FlowStack vs Celestis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FlowStack
Read full descriptionHide full description
There are over 16,000 AI tools out there. Nobody tells you which ones to use, where to start, or what to do first. You open 12 tabs, get overwhelmed, and close them all. FlowStack-AI fixes that. 500+ hand-picked AI tools — organized by category, searchable, and one tap away. No tech skills required. No rabbit holes. Just the right tool, right when you need it. -------------------------- WHAT'S INSIDE -------------------------- 9 ORGANIZED CATEGORIES Every tool sorted by what you're trying to do — not by who made it. - AI Chat & Research — Claude, ChatGPT, Gemini, Perplexity and more - Voice & Meetings — record, transcribe, and summarize any meeting automatically - Build & Deploy — build websites and apps without writing a single line of code - Image, Video & Design — create graphics, videos, and visuals in minutes - Content & Social — write posts, captions, scripts, and ad copy at scale - Data & Automation — connect apps, automate tasks, and eliminate repetitive work - Productivity & Planning — AI calendars, note-takers, and project managers - Business & Sales — CRM tools, outreach assistants, and pitch builders - Learn & Prompt — master AI faster with guided prompts and templates AI GUIDES — Step-by-Step Workflows 36 guided workflows that walk you through real tasks from start to finish: - Build and launch a website - Write or rewrite any professional email - Create a week of social media content - Build a presentation or pitch deck - Plan a trip or travel itinerary - Record and summarize a meeting automatically - Start a podcast from scratch - Automate a repetitive task - Get fit with AI — workout and meal plans - Grow a YouTube channel with AI - And 26 more PROMPT LIBRARY 48 copy-paste prompts ready to use with Claude or ChatGPT — for writing, business, sales, marketing, coding, career, and personal productivity. BUILT-IN CLAUDE AI Ask Claude anything directly inside the app. Connect your Anthropic API key and get instant responses without switching apps. Typical use costs less than $5/month. -------------------------- WHO IT'S FOR -------------------------- FlowStack-AI was built for people who aren't engineers — and don't want to be. - Remote workers and digital nomads who need to do more with less - Small business owners and entrepreneurs wearing every hat - Content creators, freelancers, and solopreneurs - Anyone curious about AI who doesn't know where to start If you've heard about AI but felt like it wasn't made for you — it was made for you. -------------------------- FREE & PRO -------------------------- Free access includes 25 hand-picked AI tools, AI guides, and the built-in Claude launcher — enough to get real results from day one. Try Pro free for 7 days — then $34.99/year. Unlocks all 500+ tools, all 36 guides, the full prompt library, and every future tool we add. -----------------------
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.
- 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
Read full descriptionHide 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
Verdict
The clearest difference is update cadence: Celestis at every 2 weeks against FlowStack's every 5 months. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FlowStack ships an update every 5 months, Celestis every 2 weeks. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.
| Parameter | FlowStack | Celestis |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.2 | 26.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 3.0 GB |
| Age rating | 17+ | 12+ |
| Developer | David Castellano | Celestis Ai Inc |
In-app purchases
FlowStack
No in-app purchases
Celestis
No in-app purchases









