# BlackBox vs Flowdia Diagrams

The clearest difference is review sentiment: BlackBox at 100% against Flowdia Diagrams's 54%. BlackBox also leads on rating (4.6 vs 3.4) and in-app purchases (none vs 1). Flowdia Diagrams's advantage is update cadence (every 2 weeks vs every 9 months) and ratings volume (67 vs 9). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flowdia Diagrams sells 1 one-off in-app purchase. BlackBox asks for nothing beyond the download.

BlackBox holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: Flowdia Diagrams has 67 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 100% of BlackBox's written reviews are positive against 54% of Flowdia Diagrams's.

BlackBox ships an update every 9 months, Flowdia Diagrams every 2 weeks. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | BlackBox | Flowdia Diagrams |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/blackbox-text/id1025392285/reviews)** | [3.4 (67 ratings)](https://appshunter.io/ios/app/flowdia-diagrams/id1170864140/reviews) |
| Number of ratings | 9 | **67** |
| Positive reviews | **100.0% of reviews** | 54.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 24 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Brian Daneshgar](https://appshunter.io/developer/1019118646) | [Behzad Gorimar](https://appshunter.io/developer/1125854088) |

## What reviewers say

### BlackBox

[App page](https://appshunter.io/ios/app/blackbox-text/id1025392285)

A simple app for collecting and organizing user-generated text snippets, like fortunes or insightful quotes. Users can easily add their own entries with a swipe gesture to build a personal collection of interesting text.

**Highlights:** Collect user-generated text, Add entries with swipe gesture, Organize text snippets, Store fortunes and quotes

**Features:** macOS Compatibility

**In-app purchases:** none


### Flowdia Diagrams

[App page](https://appshunter.io/ios/app/flowdia-diagrams/id1170864140)

Create professional flowcharts, mind maps, and various other diagrams with an intuitive interface. Easily connect shapes, add elements, and customize your designs. Export your work in multiple formats, including PNG, JPG, PDF, and SVG.

**Highlights:** Create flowcharts, mind maps, BPMN, and network diagrams, Intuitive shape connection and element addition, Customizable shape appearance, Export to PNG, JPG, PDF, and SVG, Import custom images, Supports various UML diagram types

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Premium | $9.99 | one-time |


## Frequently asked questions

### Is BlackBox free?

BlackBox is free to download, with no in-app purchases.

### Is Flowdia Diagrams free?

Flowdia Diagrams is free to download, with in-app purchases available.

### Which has better reviews, BlackBox or Flowdia Diagrams?

BlackBox is rated higher. BlackBox averages 4.6 out of 5 from 9 ratings, while Flowdia Diagrams averages 3.4 from 67 ratings.

### Do BlackBox or Flowdia Diagrams have ads?

Neither BlackBox nor Flowdia Diagrams shows ads.

### Which is updated more often, BlackBox or Flowdia Diagrams?

BlackBox ships an update every 9 months, and Flowdia Diagrams every 2 weeks. Most recently, BlackBox was updated on November 1, 2026 and Flowdia Diagrams on November 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*