Comparison

Lekh vs ThinkSpace

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

Head to head
About

Lekh

This app provides an infinite canvas for freehand drawing and creating various diagrams. It intelligently converts sketches into precise shapes and connections, supporting a wide range of diagram types for business, design, and planning.

Highlights
  • Infinite canvas for drawing
  • Smart diagram and flowchart creation
  • Layout and inspection report drawing
  • Swimlane and business process mapping
  • Rapid UI wireframing
  • Support for numerous diagram types
  • Online and offline modes
Features
Read full description

Lekh is a diagram and flowchart maker that understands your sketches. Draw a box, an arrow or a wall by hand and Lekh turns it into a clean shape. Make flowcharts, diagrams, floor plans and layouts, mind maps, UML and network diagrams, mark up photos and take visual notes, on Android, iPhone, iPad, Mac and the web, online or offline. Infinite canvas: Lekh whiteboard offers an infinite canvas, giving you the freedom to draw concepts, ideas, or diagrams as if you had limitless and endless paper. Diagram & flowchart maker: You can draw flowchart shapes and diagramming shapes such as rectangles, circles, connection lines etc just by sketching. In smart mode, you draw as naturally as on paper, and Lekh automatically transforms your rough sketches into precise shapes and connections. Lekh features best-in-class shape recognition technology. Photo markup & visual notes: Import a photo, screenshot or plan and draw on it: circle problems, add arrows, measurements and text. Keep handwritten notes and sketches next to your diagrams on one infinite canvas. Floor plans, site plans & inspection drawings: Lekh is perfect for creating roof, window, or house inspection drawings where you need to design layouts and add measurements. With Lekh's smart mode, you can quickly sketch layouts on the screen and easily add text by double-clicking anywhere. It's also great for quickly drawing basic floor plans, house plans, street maps, parking lot layouts, fence layouts, and more. Mark posts and gates on a fence run, write window and door sizes on a photo of each opening, draw gutter and downspout runs on a house photo, and sketch deck, patio and shed site plans. Turn on scaling to draw to scale in inches or cm, write the measurements on, and export a PDF for your customer. Sketch simple wiring and electrical layouts with lines, shapes and labels. Swimlane diagram & business process mapping: With Lekh, you can create swimlane diagrams, process flow diagrams, and business process mapping diagrams. The Lekh shape library includes BPMN and Archimate shapes, allowing you to draw any type of business diagram. Rapid UI Wireframing: Lekh enables you to create UI wireframes swiftly. The shape library offers customizable wireframe shapes that can be easily configured to achieve your desired results in no time. More diagram types: With Lekh, you can create a wide variety of diagrams, including mindmaps, UML, ERD, sequence diagrams, state diagrams, use cases, data flow diagrams (DFD), org charts, and cloud architectures like AWS, GCP, and Azure, among others. Works with AI: Connect Lekh to Claude or ChatGPT and ask it to draw or change a diagram on your board. The result is a normal Lekh board you can keep editing by hand. Online and Offline mode: Lekh functions in both online and offline modes. In online mode, your drawings and diagrams are stored on the Lekh cloud, allowing you to access them from any device, including through browsers. This mode also enables real-time collaboration, where multiple users can draw on the same canvas simultaneously. In offline mode, all drawings are saved directly to your device, and no internet connection is needed. Cross platform: Lekh is a cross-platform app that works on a wide range of devices, including browsers. Visit our homepage to learn more. Free and Individual plans: Free: 3 cloud boards and unlimited boards on your device. Individual plan: unlimited cloud boards, sync, real-time collaboration and custom shape libraries. We appreciate every feedback we receive. Your constant interest and improvement ideas keep the updates coming. Check out https://lekh.app for more info. Reach out to us at info@lekhapp.com for any query. Visit our youtube channel https://www.youtube.com/channel/UCiNazNZGwEkefO_kJXXdX6g for video demos. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

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.

Highlights
  • Handwritten sticky notes
  • Unlimited canvas sizes
  • Idea generation frameworks
  • Real-time sharing
  • Mind mapping
  • Diagram creation
  • AI brainstorming
Features
Read full description

Too much on your mind, and no idea where to start? AI chats, posts you saw, books you read, things people told you. There is more to think about every day. ThinkSpace is a thinking notebook: put your thoughts on cards, then arrange and connect them as you think. As you move cards around and put ideas into your own words, your understanding deepens. ■ How it works Start with a single card: whatever is on your mind. 1. Collect: AI chats, web pages, photos, passing thoughts, via the Inbox or by pasting. 2. Write it down: turn them, and what is in your head, into handwritten or text cards. 3. Arrange and see the big picture: move, group, and connect cards. Step back, and unexpected connections, next questions, and next actions appear. 4. Explain: say what your cards or map mean, out loud, in your own words. Read the transcript back to check what you really understand. ■ Great for - Clearing your head when AI chats pile up - Making sense of books and videos, and turning them into questions and actions - Connecting ideas from research papers and textbooks so you can explain them in your own words - Creating nursing concept maps and connecting conditions, symptoms, and care - Bringing a story's world, characters, timeline, and ideas into one structure - Journaling: writing out tangled feelings and worries - Designing your career in the AI era, a social media strategy, or a product - Connecting visions and goals to concrete actions and reviews - Working through 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 about a card and add the answers to your map. Break answers into ideas, connect them, and make sense of them in your own words; looking over the map sparks new questions to dig into. Your AI inputs are never used for training. ■ Key features - Infinite canvas: place cards anywhere, half-formed thoughts included. - Handwriting and text: Apple Pencil supported. Jot down ideas on cards and move them around with your finger. - Mind maps, flowcharts, groups, and connections: radial thinking, steps, cause and effect. - Send from AI chats: send a conversation from Claude or the share sheet to the ThinkSpace Inbox, then drag it in as a card. - Explain out loud: describe a card or map in your own words; it is transcribed and saved. You notice where your understanding is thin, and can read it back later. - Ask AI: ask about a card and add the answer as a new card. - Extract key-point cards from long notes and web pages. - AI brainstorming: branch a topic card into angles and questions. - Paste into cards: copied text, photos, or URLs become cards. - Add web pages, images, and screenshots to your canvas. - Search and reuse cards across maps. - Link canvases: big themes and subtopics in layers. - Export to image, PDF, and text. - Local-first: saved on your device, works offline. - Sync across devices (Pro): iPhone, iPad, and Mac. Turn scattered information and AI answers into understanding you can explain and act on. ■ 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

Screenshots

Lekh4 screens
ThinkSpace4 screens

Verdict

The call

Lekh and ThinkSpace both sit at 4.2 stars, but that hides the real split: 72% of Lekh's written reviews are positive against 54% of ThinkSpace's. Lekh also leads on update cadence (fortnightly vs every 6 weeks) and iOS requirement (13.4 vs 15.6). ThinkSpace's advantage is ratings volume (276 vs 15). 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. Lekh sells 2 in-app purchases, starting at $3.99 per month and ThinkSpace sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.2 for Lekh against 4.3 for ThinkSpace. That said, the two scores are not equally well evidenced: ThinkSpace has 276 ratings behind it against 15, so its average is the more settled of the two. Written reviews are what separate them: 72% of Lekh's written reviews are positive against 54% of ThinkSpace's.

UpkeepUpdate frequency

Lekh ships an update fortnightly, ThinkSpace every 6 weeks. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
Lekh versus ThinkSpace: the parameters behind the verdict, then further details
ParameterLekhThinkSpace
PriceFreeFree
Rating4.2 (15 ratings)4.3 (276 ratings) — better
Positive reviews71.9% of reviews — better53.6% of reviews
Number of ratings15276 — better
Update frequencyFortnightly — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, MaciPhone, iPad, iPod, Mac
Requires iOS13.4 — better15.6
Further details — not scored
Size15 MB261 MB
Age rating4+17+
DeveloperLEKHAPP LLCNaoya Enokida

Customer experience

Lekh

All ratings15 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews57 reviews
Positive71.9%
Neutral10.5%
Negative17.5%

ThinkSpace

All ratings276 ratings
Positive82.2%
Neutral5.8%
Negative12.0%
Written reviews220 reviews
Positive53.6%
Neutral9.5%
Negative36.8%

Bugs and requests

Lekh

Not enough reviews yet to summarise bugs or 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
Show 15 more
  • 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
Show 14 more
  • 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

In-app purchases

2 purchases

Lekh

Subscriptions2
  • Lekh Premium for one month$3.991 Month
  • Lekh Premium for one year$34.991 Year
2 purchases

ThinkSpace

Subscriptions2
  • ThinkSpace Pro Access$2.991 Month
  • ThinkSpace Pro Access$29.991 Year

Questions

Is Lekh free?
Lekh is free to download, with in-app purchases available.
Is ThinkSpace free?
ThinkSpace is free to download, with in-app purchases available.
Which has better reviews, Lekh or ThinkSpace?
ThinkSpace is rated higher. Lekh averages 4.2 out of 5 from 15 ratings, while ThinkSpace averages 4.3 from 276 ratings.
Do Lekh or ThinkSpace have ads?
Neither Lekh nor ThinkSpace shows ads.
Which is updated more often, Lekh or ThinkSpace?
Lekh ships an update fortnightly, and ThinkSpace every 6 weeks. Most recently, Lekh was updated on October 24, 2026 and ThinkSpace on October 24, 2026.

Other comparisons