Comparison

Diagrams Notepad 3 vs Zen Pi

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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!

About

Zen Pi

This app helps you manage your time by breaking it down into weekly and daily increments. It tracks time remaining in seconds for both the day and the year, and offers a daily astrological outlook.

Highlights
  • Weekly time management
  • Daily time tracking in seconds
  • Time remaining in year calculation
  • Daily astrological outlook
  • Productivity enhancement
Features
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Use Zen Pi to work in increments of weeks. The days will pass quickly, that is why Zen Pi tracks the week number. Zen Pi can help you be productive, and make good use of your time. You can work with each week, and each day as they come and go. Features the time remaining each day in seconds. And the time remaining this year in seconds. Also we provide a daily outlook, a modern day astrological forecast each day, for you to use.

Screenshots

Diagrams Notepad 34 screens
Zen Pi2 screens

Verdict

The call

The clearest difference is rating: Zen Pi at 5.0 against Diagrams Notepad 3's 3.5. Zen Pi also leads on in-app purchases (none vs 1). Diagrams Notepad 3's advantage is update cadence (monthly vs every 7 months) and ratings volume (52 vs 2). On price, ads, device support and iOS requirement 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. Diagrams Notepad 3 sells 1 one-off in-app purchase. Zen Pi asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Zen Pi holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Diagrams Notepad 3 has 52 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Diagrams Notepad 3 ships an update monthly, Zen Pi every 7 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard5 real differences · 5 level
Diagrams Notepad 3 versus Zen Pi: the parameters behind the verdict, then further details
ParameterDiagrams Notepad 3Zen Pi
PriceFreeFree
Rating3.5 (52 ratings)5.0 (2 ratings) — better
Positive reviews39.0% of reviews—
Number of ratings52 — better2
Update frequencyMonthly — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Mac
Requires iOS15.0 — better16.6
Further details — not scored
Size29 MB1 MB
Age rating4+17+
Developersunata UG (haftungsbeschraenkt)Christopher Huffaker

Customer experience

Diagrams Notepad 3

All ratings51 ratings
Positive62.7%
Neutral3.9%
Negative33.3%
Written reviews105 reviews
Positive39.0%
Neutral8.6%
Negative52.4%

Zen Pi

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Diagrams Notepad 3

One-time1
  • Unlimited number of diagrams$22.99
None

Zen Pi

No in-app purchases

Questions

Is Diagrams Notepad 3 free?
Diagrams Notepad 3 is free to download, with in-app purchases available.
Is Zen Pi free?
Zen Pi is free to download, with no in-app purchases.
Which has better reviews, Diagrams Notepad 3 or Zen Pi?
Zen Pi is rated higher. Diagrams Notepad 3 averages 3.5 out of 5 from 52 ratings, while Zen Pi averages 5.0 from 2 ratings.
Do Diagrams Notepad 3 or Zen Pi have ads?
Neither Diagrams Notepad 3 nor Zen Pi shows ads.
Which is updated more often, Diagrams Notepad 3 or Zen Pi?
Diagrams Notepad 3 ships an update monthly, and Zen Pi every 7 months. Most recently, Diagrams Notepad 3 was updated on November 2, 2026 and Zen Pi on October 30, 2026.

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