TheBrain vs Diagrams
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.
Diagrams
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Turn ideas into beautiful and professional diagrams using Apple Intelligence (On-device AI). Describe a problem, concept, or process — and instantly get a clean, structured, vector-based diagram. A modern evolution of concept mapping and brainstorming — fast, smart, and visually stunning. A universal visual thinking tool for work, study, and everyday problem solving. From simple notes to complex systems, it helps you structure ideas visually across science, technology, business, education, and engineering. Not a drawing app. A thinking app. Turn ideas into visuals — instantly. Designed for specification-driven diagram generation rather than chat. AVAILABLE DIAGRAM SKILLS: • Kanban • Gantt Chart • Mindmap • Conceptmap • Dependency Graph • Sticky Notes • Lists • Data Model (e.g. ER Diagram) • Object Model • Organizational Chart • Decision Tree • Processflow • Workflow (e.g. swimlane or activity diagram) • Messageflow (e.g. sequence diagram) • Tree Structure • Information Architecture (e.g. sitemap) • Layered Architecture • Client-Server Architecture Every skill includes a ready-to-use example prompt to help you get started. KEY FEATURES: • AI-powered diagram generation from text prompts • Vector-based output (PDF quality, not raster images) • Export or share the PDF diagram • Runs fully on-device using Apple AI models • No subscriptions, no usage limits • Clean, structured, professional diagrams • Works for any domain: science, business, education, engineering and more USE IT FOR: • Explaining concepts • Studying complex topics • Planning projects and systems • Creating structured diagrams from ideas • Visualizing workflows, processes, and relationships • Turning messy thoughts into clarity DESIGNED FOR: • Students learning complex subjects • Professionals in documents and presentations • System and business analysts • Engineers designing systems and flows • Software architects and developers • Teachers explaining concepts visually • Anyone who thinks better visually Apple Intelligence is required for this app. Make sure it is supported on your device and enabled in Settings.
Screenshots
Verdict
The clearest difference is price: TheBrain at Free against Diagrams's $4.99. TheBrain also leads on iOS requirement (15.0 vs 26.0). Diagrams's advantage is in-app purchases (none vs 2) and update cadence (every 5 days vs fortnightly). On 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
TheBrain is free to download; Diagrams costs $4.99 up front. TheBrain sells 2 in-app purchases, starting at $17.99 per month. Diagrams asks for nothing beyond the download.
TheBrain ships an update fortnightly, Diagrams every 5 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.
| Parameter | TheBrain | Diagrams |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.8 (171 ratings) — better | — |
| Positive reviews | 44.3% of reviews | — |
| Number of ratings | 171 — better | — |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 254 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | TheBrain Technologies LP | Elsa Mourato |
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
Diagrams
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
Diagrams
No in-app purchases









