# Watermelon Backup vs Bonsai Studio by PrismML

The clearest difference is in-app purchases: Bonsai Studio by PrismML at none against Watermelon Backup's 1. Bonsai Studio by PrismML also leads on rating (5.0 vs 4.5). Watermelon Backup's advantage is review sentiment (97% vs 75%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Watermelon Backup sells 1 one-off in-app purchase. Bonsai Studio by PrismML asks for nothing beyond the download.

Bonsai Studio by PrismML holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 13 and 7 respectively. Written reviews complicate that: 97% of Watermelon Backup's written reviews are positive against 75% of Bonsai Studio by PrismML's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Watermelon Backup | Bonsai Studio by PrismML |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (13 ratings)](https://appshunter.io/ios/app/watermelon-backup/id6762260596/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/bonsai-studio-by-prismml/id6767042620/reviews)** |
| Number of ratings | **13** | 7 |
| Positive reviews | **96.7% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 days | Every 2 days |
| Monetization | Free with in-app purchases | **Free** |
| Size | 42 MB | 100 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [ZIZICICI LIMITED](https://appshunter.io/developer/1564555697) | [Prism ML](https://appshunter.io/developer/1896355493) |

## What reviewers say

### Watermelon Backup

[App page](https://appshunter.io/ios/app/watermelon-backup/id6762260596)

Securely back up your iPhone photo library to your own storage, not a third-party cloud. Organize and manage your photos by month, with options to back up, download, or sync. It intelligently avoids unnecessary transfers and can access iCloud Photos when needed.

**Highlights:** Backup iPhone photos to personal storage, Supports NAS, SFTP, S3, WebDAV, SMB, Organize backups by month, Intelligent transfer to avoid duplicates, Pause and resume backup tasks, Restore photos and videos from backup

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Watermelon Pro | $9.99 | one-time |


### Bonsai Studio by PrismML

[App page](https://appshunter.io/ios/app/bonsai-studio-by-prismml/id6767042620)

Create high-quality images directly on your iPhone without an internet connection. This app uses advanced AI models that run locally, ensuring your prompts and creations remain private on your device. Experience fast, on-device image generation for everyday creative workflows.

**Highlights:** On-device image generation, Offline functionality, Multiple resolutions and aspect ratios, Save images to Photo Library, Built-in prompt moderation, Open weights license

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Watermelon Backup free?

Watermelon Backup is free to download, with in-app purchases available.

### Is Bonsai Studio by PrismML free?

Bonsai Studio by PrismML is free to download, with no in-app purchases.

### Which has better reviews, Watermelon Backup or Bonsai Studio by PrismML?

Bonsai Studio by PrismML is rated higher. Watermelon Backup averages 4.5 out of 5 from 13 ratings, while Bonsai Studio by PrismML averages 5.0 from 7 ratings.

### Do Watermelon Backup or Bonsai Studio by PrismML have ads?

Neither Watermelon Backup nor Bonsai Studio by PrismML shows ads.

### Which is updated more often, Watermelon Backup or Bonsai Studio by PrismML?

Watermelon Backup ships an update every 2 days, and Bonsai Studio by PrismML every 2 days. Most recently, Watermelon Backup was updated on October 31, 2026 and Bonsai Studio by PrismML on October 31, 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.*