TheBrain vs Compaxi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TheBrain
This app helps you capture, connect, and visualize all your ideas, notes, and files across devices. It acts as a digital memory, showing related items and allowing for dynamic mind mapping and powerful search to help you recall information instantly.
- Award-winning visualization
- Networked notes with backlinks
- Dynamic mind mapping
- Easy idea capture
- Cross-device sync
- Powerful search
- Visual file management
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YOUR DIGITAL MEMORY. VISUALIZED. TheBrain is the unique knowledge app that helps you capture everything — ideas, notes, web pages, files, photos — and connect it all the way you naturally think. Stop hunting through folders, tabs, and search bars. Start seeing your knowledge as a living network you can navigate with a tap. Described by the Wall Street Journal as "Software that thinks like you do" and MacLife as "the most compelling mind mapping adaptation we've encountered." Winner of KMWorld's Trendsetting Products award. WHY THEBRAIN? Traditional notes apps trap your ideas in folders, tags, or endless lists. TheBrain lets every piece of information connect to anything else — so the right idea finds you the moment you need it. It's note-taking, mind mapping, file management, and AI rolled into one beautiful experience that works the same on every device. KEY FEATURES CEREBRO — TALK TO YOUR BRAIN WITH AI Our built-in agentic AI assistant. Ask Cerebro anything — and let it create new thoughts and notes, surface exactly what you need, summarize long documents, suggest meaningful links, or just have a conversation about what you know. It can do anything you can do — only faster. DYNAMIC THOUGHT NETWORK Move beyond conventional mind maps and folders. TheBrain's animated visualization shows your ideas, their context, and the relationships between them — at any scale. Tap a thought, and the entire network reorganizes around it. NETWORKED NOTES Rich notes shown in context with automatic backlinks and concept discovery. Hybrid WYSIWYG + Markdown writing, powerful tables, resizable images, math, and folding — all the modern editor essentials. EVERYTHING IN ONE PLACE Attach web pages, PDFs, photos, and documents to any thought. Link people, projects, files, and ideas in a single living workspace. POWERFUL SEARCH Find any note, file, web page, or idea in seconds. Every match appears in the context of your thought network, so you instantly see how it relates to everything else you know. SEAMLESS SYNC ACROSS DEVICES Your brain is always with you. Mobile, Mac, Windows, Linux, and web stay in sync — even with large brains. Smart Sync downloads attachments on demand, keeping your brain fast and lightweight on every device. INFINITE SCALE Effortlessly handles hundreds of thousands of items and many gigabytes of data — without slowing down. COLLABORATE AND SHARE Publish your brain online for the world, or sync thoughts privately with your team. Great for shared knowledge bases, project planning, and team research. ==================================== WAYS TO USE THEBRAIN • Build your second brain — a living reflection of how you think, ready when you need it. • Manage everything in your life: projects, people, goals, files, and ideas in one place. • Capture interesting articles, videos, and references so they're activated when you need them. • Organize trips, travel, and major life events with all the right context at hand. • Power your research — go deeper on any concept and see how it connects to everything else. • Turn goals into action by linking them with the resources needed to achieve them. • Build a knowledge base that sparks new ideas and breakthroughs. • Link people, projects, and information for a smarter view of your business. • Create topic brains around your passions, hobbies, and special interests. • Plan personal projects like home renovations, weddings, or major purchases. GET STARTED IN MINUTES Start with a single thought — your name, a project, an idea you want to explore. Add a few connections. Within minutes you'll understand why people have trusted TheBrain for over two decades. For the best experience, install TheBrain on your phone, tablet, and computer. Our iPhone, iPad, Mac, Windows, and other mobile clients all sync seamlessly — your best thinking is always with you.
Compaxi
This app helps you organize your thoughts, memories, and experiences into a personal knowledge graph. It uses AI to find connections across your history, allowing you to ask questions about your past and visualize your life's patterns. Import photos and data to build your graph faster.
- Conversational journaling with AI
- Personal knowledge graph
- Semantic search across history
- Photo import with memory extraction
- Interactive graph visualization
- Daily journaling reminders
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Write about your day, a decision you're weighing, or a memory that resurfaced, and Compaxi automatically organizes everything into a personal knowledge graph of people, places, and experiences, finding connections across your entire history. No new format to learn. Just talk to Compaxi the way you'd talk to a good friend. Share what happened, what you're thinking about, or what you're trying to figure out. Every conversation becomes part of your personal memory graph. Connections you didn't see coming: That coffee chat last Tuesday and a career decision from two years ago? They're linked. Compaxi finds second, third, and fourth-order connections across everything you've ever written, patterns you'd never spot in a traditional journal. Ask your past. Plan your future. "What led to my best decisions?" "Who have I lost touch with?" "What was I feeling the last time I faced something like this?" Ask real questions and get answers drawn from your own experiences, not generic advice. Your knowledge graph, visualized: See your memories as an interactive graph. Events, people, and places appear as nodes. The connections between them reveal the hidden structure of your life: the recurring themes, the people who shaped your thinking, the places where breakthroughs happened. Jumpstart with what you already: Import photos from your library and Compaxi extracts the memories behind them, or connect your Instagram or bring in conversations from other AI assistants to build your graph faster. Private by design: No ads. No data sales. Ever. Features • Conversational journaling powered by AI • Personal knowledge graph connecting people, places, and events • Semantic search across your entire history • Photo import with automatic memory extraction • Instagram and AI data import • Interactive graph visualization • Daily journaling nudges and follow-up reminders
Screenshots
Verdict
The clearest difference is in-app purchases: Compaxi at none against TheBrain's 2. Compaxi also leads on rating (5.0 vs 4.8). TheBrain's advantage is ratings volume (166 vs 1) and iOS requirement (15.0 vs 17.6). On price, ads 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. TheBrain sells 2 in-app purchases, starting at $17.99 per month. Compaxi asks for nothing beyond the download.
Compaxi holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: TheBrain has 166 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | TheBrain | Compaxi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (166 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 44.3% of reviews | — |
| Number of ratings | 166 — better | 1 |
| Update frequency | Monthly | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 261 MB | 7 MB |
| Age rating | 4+ | 12+ |
| Developer | TheBrain Technologies LP | Mert Gerdan |
Customer experience
TheBrain
Compaxi
Bugs and requests
TheBrain
Reported bugs
5 issues- Crashes on iOS 9
- Inability to open brains
- Freezing after each action
- Login and account issues
- Sync problems
Requested features
7 requests- Offline mode
- Improved mobile UI and UX
- Better integration with other apps
- More affordable pricing options
- Enhanced search and filtering
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- Split-screen support on iPad
- Handwriting and stylus support
Compaxi
Not enough reviews yet to summarise bugs or requests.
In-app purchases
TheBrain
- TheBrain Pro Monthly$17.991 Month
- TheBrain Pro Annual$189.991 Year
Compaxi
No in-app purchases









