ThinkSpace vs Diagrams Notepad 3
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThinkSpace
This app is a powerful thinking tool that supports creative workflows with an intuitive interface and various thinking methods. It offers features like handwritten notes, unlimited canvases, idea generation frameworks, and real-time collaboration to aid brainstorming and idea structuring.
- Handwritten sticky notes
- Unlimited canvas sizes
- Idea generation frameworks
- Real-time sharing
- Mind mapping
- Diagram creation
- AI brainstorming
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Information piles up. AI has all the answers. But a week later, nothing stays in your head. ThinkSpace is a thinking canvas where you turn what you explore with AI into your own map — with your own hands. Only the maps you build yourself stay with you. In ThinkSpace, a map you grow — one that stays with you — is called a design map. It is not a static diagram you draw once. It keeps evolving as you add new information, AI conversations, and results from what you tried — a living model of your own understanding. ■ Great for topics like - Integrating papers and books into an understanding you can explain in your own words - Visualizing nursing pathophysiology diagrams and how what you learn connects - Bringing a story's world, characters, timeline, and ideas into one structure - Writing out tangled feelings and worries to sort out your inner thoughts - Designing your career in the AI era, social media strategy, or product concepts - Connecting visions and goals to concrete actions and reviews - Working through complex problems at work: causes, solutions, validation, results ■ Start from a purpose-built map No need to stare at a blank canvas wondering where to begin. - Concept map - Problem-solving map - Pathophysiology map - Career map for the AI era - Worldbuilding map - Social media strategy map - Habit-building map - Product design map - Vision map and more — start from a foundation that fits your topic. ■ Turn AI chats into a growing map Ask AI from a card and add the answers to your map. Instead of just reading responses, break them down, relate them, and rebuild them as your own understanding. Looking over the map sparks new questions — dig into them with AI again. Your AI inputs are never used for training. ■ Key features - Infinite canvas: place cards anywhere and work with unorganized thoughts as they are. - Handwriting and text: Apple Pencil supported. Write like sticky notes and move them as you think. - Mind maps, flows, groups, relation lines: express radial thinking, procedures, cause and effect. - Ask AI and break answers into cards: turn answers into understanding you can explain. - Extract key-point cards from text: turn long notes and web pages into material for thinking. - AI brainstorming: generate a skeleton that widens your view. You fill in evidence and conclusions. - Capture web pages, images, screenshots: place research inside your own topic. - Search and reuse cards: find past fragments and recombine them in other maps. - Link canvases: connect big themes and subtopics into layers of thought. - Export to image, PDF, and text: output maps for reports, submissions, and sharing. - Local-first: data is saved on your device first. Edit offline, export anytime. - Sync across devices (Pro): grow the same maps on iPhone, iPad, and Mac. Turn AI answers into understanding you can explain. Turn scattered information into a map that leads to your next decision and action. Grow your own way of thinking with ThinkSpace. ■ Pro access - Unlimited canvases - Unlimited cards and groups - Expanded AI usage limit - Full feature access ——— Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. The renewal fee is charged to your iTunes account within 24 hours before the period ends. You can turn off auto-renewal anytime in your App Store account settings. ——— Terms of Service: https://thinkspace-public.s3.ap-northeast-1.amazonaws.com/terms-en.html Privacy Policy: https://thinkspace-public.s3.ap-northeast-1.amazonaws.com/privacy-policy-en-v2.html
Diagrams Notepad 3
Create and sync diagrams, flowcharts, and mind maps across iPhone, iPad, and Mac. Supports Apple Pencil for drawing and offers collaboration features. Export in various formats.
- Cross-device sync via iCloud
- Vector-based shapes and connectors
- Apple Pencil support
- Diagram sharing and collaboration
- Export to PDF, PNG, JPEG
- Unlimited diagram size
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NEW - Create diagrams on iPhone, iPad and Mac and sync them together! New Design - Pencil Support - Folders - File Export/Import - Markup Editing - UML Class Editor and more... Create quickly and creatively wonderful diagrams and notes, flowcharts, mind maps, pinboards, organigrams, software models and AWS diagrams on your iPhone, iPad and Mac. Sync your diagrams optionally and automatically between all iOS and macOS devices. Add shapes, connectors, images, drawings and weblinks. Draw shapes and connectors, take notes and add markup with Apple Pencil or a finger. Share diagrams and collaborate on them with other users through iCloud. Key features • Automatic sync using iCloud between your iOS and macOS devices • Vector based shapes and connectors • Color themes and styles for the entire diagram • Drag and drop (on iPad) or copy and paste to insert graphics, photos or URLs (rich links) from other apps directly to the diagram • Drawing shapes and connectors with Apple Pencil or a finger • Undo and redo all changes • Export diagrams as vector PDF documents or PNG or JPEG images • Diagram iCloud sharing and collaboration with your team or friends • Designed for iOS and iCloud The app uses iCloud to optionally and automatically sync diagrams between your iOS and macOS devices. You can also share your diagrams and collaborate on them with other users. • Diagrams without size limits The diagram automatically resizes to fit your content as you add more shapes. You can add shapes from any side of the diagram. • Each diagram has its own style Your recently used color styles, shapes and connectors will be saved separately for each diagram. • Replace shapes and connectors at any time Replace any selected shapes in the diagram with another shape from the toolbar or with an image or web-link from the clipboard. The existing text and connections of connectors will not change. • Free version with all functions Download the free version of the application and try out all the features. You can add and edit two diagrams with a limited number of shapes in each diagram. Upgrading to an unlimited number of diagrams and shapes is possible through an In-App Purchase. • We are looking forward to your feedback If you enjoy using the Diagrams Notepad app, please add a rating or write a review on the App Store. If you have further questions or suggestions about the app, please send us an e-mail to: info@diagrams-notepad.com Thank you for using the Diagrams Notepad app!
Screenshots
Verdict
The clearest difference is rating: ThinkSpace at 4.3 against Diagrams Notepad 3's 3.5. ThinkSpace also leads on review sentiment (54% vs 39%) and ratings volume (273 vs 51). On price, update cadence, 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
Both are free to download. ThinkSpace sells 2 in-app purchases, starting at $2.99 per month and Diagrams Notepad 3 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
ThinkSpace holds the better App Store score, 4.3 against 3.5. That said, the two scores are not equally well evidenced: ThinkSpace has 273 ratings behind it against 51, so its average is the more settled of the two. Written reviews point the same way: 54% of ThinkSpace's written reviews are positive against 39% of Diagrams Notepad 3's.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 19, 2026 and October 1, 2026 respectively.
| Parameter | ThinkSpace | Diagrams Notepad 3 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (273 ratings) — better | 3.5 (51 ratings) |
| Positive reviews | 53.6% of reviews — better | 39.0% of reviews |
| Number of ratings | 273 — better | 51 |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac | iPhone, iPad, iPod, Mac |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 238 MB | 29 MB |
| Age rating | 17+ | 4+ |
| Developer | Naoya Enokida | sunata UG (haftungsbeschraenkt) |
Customer experience
ThinkSpace
Diagrams Notepad 3
Bugs and requests
ThinkSpace
Reported bugs
20 issues- App crashes on launch or during use
- Data disappears after upgrading to paid version
- Canvas fails to load with many items
- Text boxes become uneditable
- Grouped items move unexpectedly when resizing
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- Eraser tool causes crashes
- Login freezes and network connection errors
- Registration and account creation failures
- Undo function doesn't work properly
- Cards stick or behave erratically
- Zoom tool tab not displaying
- Export function unresponsive on Mac
- Text wrapping and alignment issues
- Sticky notes change size unexpectedly
- Items disappear from canvas
- Forced quit required to close app
- Laggy performance with Apple Pencil writing
- Sync failures between iPad and Mac
- Auto-organize feature snaps items incorrectly
- White background export issues
Requested features
19 requests- One-time purchase option instead of subscription
- Dark mode theme
- Better palm rejection for Apple Pencil
- Folder/project organization system
- Ability to delete canvases easily
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- Improved text editing within cards
- Better arrow/connector customization
- Undo with multi-finger gestures (like Procreate)
- Export to vector formats (SVG)
- Zoom controls for Mac version
- Better grouping and ungrouping functionality
- Collaborative editing features
- iCloud sync option
- Highlighter tool
- Custom colors and pen sizes
- Canvas renaming functionality
- Better keyboard shortcuts for Mac
- Chromebook support
- Auto-layout option for mind maps
Diagrams Notepad 3
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ThinkSpace
- ThinkSpace Pro Access$2.991 Month
- ThinkSpace Pro Access$29.991 Year
Diagrams Notepad 3
- Unlimited number of diagrams$22.99









