# PlantUML App — Smart edit PlantUML diagrams

> Native iPad PlantUML editor with AI diagram generation and text editing. (iPhone/iPad app by Bartolomeo Sorrentino.)

- Source: https://appshunter.io/ios/app/plantuml-app/id6444164984 (this page in markdown: same URL + `.md`)
- Developer: [Bartolomeo Sorrentino](https://appshunter.io/developer/791375856)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 3.00/5 from 4 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.7 · 7 MB
- Languages: American English
- Released: 2022-12-30
- Data updated: 2026-07-16
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/plantuml-app/id6444164984/reviews.md

## What is PlantUML App?

This is a native PlantUML editor app for iPad. It allows using iPad to draw diagrams in effective way. It includes use of AI to helping drawing process. take note that to enable AI features you MUST HAVE a valid "OpenAI API key" i.e. OpenAI Paid Account

Features
=======

1. Create,Update,Delete plantUML Documents
2. Share Documents with iCLoud
3. OpenAI integration
    > **You MUST HAVE a valid [OpenAI] API KEY (i.e. Paid Account)** to use this feature. Such secrets will be stored in device's keychain
    * Drawing
        * Draw Diagram using either Pencil or Fingers.
        * Processing hand drawn diagram through [OpenAI Vision API] (_gpt-4o_) to automatically genearte plantUML script.
        * PlantUML script will include alse a legend with detailed description of drawing.
    * Prompt     
        * Prompt your diagram request in natural language
        * Undo Prompt
        * Prompt's History 
        * choose AI Model (_gpt-3.5-turbo or gpt-4_)
4. Text Editor
    * Auto save over modification
    * Provide **syntax highlighting** and auto completion **diagram snippets** through [ace] editor
5. Diagram Preview 
    > Preview relies on [PlantUML online server] so it requires internet connection
    * Built in cache management
    * Scale to fit
    * Share Image (AirDrop, iCloud, Other App, ...)

## Key features

- Create, update, and delete PlantUML documents
- AI-powered diagram generation from sketches or text prompts
- Syntax highlighting and auto-completion in text editor
- Auto-save functionality
- Diagram preview with caching
- Share diagrams via AirDrop, iCloud, and other apps
- iCloud document sharing

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/plantuml-app/id6444164984/reviews.md

### 5/5 — HANDY AND HELPFUL APP

*2025-12-20*

This app is extremely helpful for software engineers and architects. With the support of AI-generated scripts, it allows users to quickly create visual diagrams, which makes UML modeling and architectural discussions much more efficient.
I hope the developer continues to improve it and make it even better.

### 1/5 — Very good idea, but terrible implementation

*2023-08-04*

This app is not even alpha level. Very good idea, but provides only line editing. Cannot select text across lines, cannot delete “new line” character.
Even more: once created text and app saying it saved it, switch to diagram or get out to list of docs and back and half of the text disappears.
Don’t know what AI would do here, but base on current state of the app, I guess nothing.
Completely useless piece of junk as for now. Don’t worth even $.99.
Hope they will make it usable and free to try.

**Developer response:** Thanks for feedback

Obviously the design choice to use an line editor instead of a free text editor seems not a good choice 🙁.
The 0.99$ is a symbolic price that help me to be committed on continuous improvement. I've planned a release 2.0 with a free text editor, hope this new release will change your mind about this app 🙏

Do you have interest to be a beta tester for new release ?

### 1/5 — Poor quality text editor with the PlantUML generator

*2023-08-02*

Right now this app is not worth downloading. It is a poor text editor with the plantuml generator

**Developer response:** Thanks for feedback

Idea was to provide a PlantUML editor easier to use providing syntax shortcuts and AI support.
Obviously the design choice to use a line editor instead of a free text editor seems not a good choice 🙁.
I've planned a release 2.0 with a free text editor, hope this new release will change your mind about this app 🙏

Do you have interest to be a beta tester for new release ?

### 5/5 — Paste sequence

*2023-08-02*

Please make this compatible with iphones, the largest models would work great with this app. Also, why does it require openAI organization ID when every other app requires just the API key? Also, I mean that ai cannot paste directly into the app as I cant seem to find a way to past an entire diagrams syntax at once. If it has to be done line by line even when importing existing text, I cant use this currently.

(Your app is the only app doing this so it deserves 5 stars.)

**Developer response:** Hi  Bran321

If copy & paste doesn't work as expected you can either share your diagram using iCloud or other connected server (e.g Drive) because the app supports standard IOS document management.

Let me Know whether this solve your issue

### 4/5 — Paste sequence

*2023-04-14, version 1.3*

This is amazing but I cant seem to find a way to past an entire diagrams syntax at once.  If it has to be done line by line even when importing existing text, I cant use this currently.

**Developer response:** Hi  Bran321

If copy & paste doesn't work as expected you can either share your diagram using iCloud or other connected server (e.g Drive) because the app supports standard IOS document management.

Let me Know whether this solve your issue

## Frequently asked questions about PlantUML App

### Does PlantUML App have ads?

No, PlantUML App does not contain advertisements.

### What devices is PlantUML App compatible with?

PlantUML App is designed exclusively for iPads.

### How much does PlantUML App cost?

PlantUML App is a paid application, available for $0.99.

### How often is PlantUML App updated?

The app was last updated on December 23, 2025, indicating recent development activity.

### What is the user rating for PlantUML App?

PlantUML App has a rating of 3.0 stars based on 4 user reviews.

### Can I use AI features without an OpenAI API key?

No, to enable the AI drawing and prompt features in PlantUML App, you must have a valid and paid OpenAI API key.

### How does the diagram preview work?

The diagram preview in PlantUML App relies on the PlantUML online server, requiring an internet connection. It also includes built-in cache management for faster loading.

### What age rating is PlantUML App?

PlantUML App has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 3.4.3 — 2025-12-23

- avoid reset picker selected tool on hidden
- start drawing view with scroll locked by default
- general improvements

### 3.4.2 — 2025-08-14

- Resolve holds on return from diagram preview
- Generic improvements

### 3.4.1 — 2025-05-21

1. Add support for Open AI models:
    - gpt-4o-mini
    - add gpt-4.1-mini (vision)
2. Make AI call contrained with json schema
3. stability improvements

### 3.3.0 — 2024-12-03

- adds offline detection
- improve diagram editor

### 3.2.0 — 2024-07-15

- add support for detecting use-case diagrams from drawing 
- generic fix and improvements

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## More apps by Bartolomeo Sorrentino

- [SlidesOnTV](https://appshunter.io/ios/app/slidesontv/id1166964658)

All apps by Bartolomeo Sorrentino: https://appshunter.io/developer/791375856

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-16.*