# iMark · Image Annotation Tool vs PDF Factory Plus

iMark · Image Annotation Tool and PDF Factory Plus both sit at 4.6 stars, but that hides the real split: 72% of iMark · Image Annotation Tool's written reviews are positive against 25% of PDF Factory Plus's. iMark · Image Annotation Tool also leads on update cadence (every 2 months vs every 26 months) and ratings volume (381 vs 10). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. iMark · Image Annotation Tool sells 4 one-off in-app purchases and PDF Factory Plus sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for iMark · Image Annotation Tool against 4.7 for PDF Factory Plus. That said, the two scores are not equally well evidenced: iMark · Image Annotation Tool has 381 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 72% of iMark · Image Annotation Tool's written reviews are positive against 25% of PDF Factory Plus's.

iMark · Image Annotation Tool ships an update every 2 months, PDF Factory Plus every 26 months. The most recent releases landed on September 22, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | iMark · Image Annotation Tool | PDF Factory Plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (381 ratings)](https://appshunter.io/ios/app/imark-image-annotation-tool/id1174741369/reviews) | **[4.7 (10 ratings)](https://appshunter.io/ios/app/pdf-factory-plus/id1663406658/reviews)** |
| Number of ratings | **381** | 10 |
| Positive reviews | **71.9% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 26 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 93 MB | 61 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iDaily Corp.](https://appshunter.io/developer/364264742) | [路 张](https://appshunter.io/developer/562716999) |

## What reviewers say

### iMark · Image Annotation Tool

[App page](https://appshunter.io/ios/app/imark-image-annotation-tool/id1174741369)

Enhance and annotate images with a comprehensive set of tools. Import from your photo library, camera, or maps, and customize your markups with various styles. Easily export and share your creations.

**Highlights:** Diverse annotation tools (arrow, text, mosaic, etc.), Import from photo library, camera, and maps, Customizable color schemes and history sessions, Crop and layer management, Export with custom image size, Supports iOS Photo Extension

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $2.99 | one-time |
| Silver Coin | $5.99 | one-time |
| Gold Coin | $14.99 | one-time |
| Coffee for Everyone | $29.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy-to-use interface
- 🎨 Comprehensive annotation tools (arrows, shapes, text, magnifier)
- 💰 Completely free with no ads
- 🎯 Powerful features for screenshot markup
- 🔧 Customizable colors and styling options

**What reviewers complain about**

- 💧 Persistent watermark on all saved images
- 🌐 Language defaults to Chinese with difficult switching
- 📝 Text size limitations on large images
- 🎨 Limited font customization options
- ⚙️ Text bubble tail control is limited

**Reported bugs**

- App crashes when using brush/pen features
- Export button hidden by system UI
- Annotations disappearing after one day
- Keyboard engagement obscures image during text input
- Magnifier tool functionality issues

**Requested features**

- Ability to remove watermark (paid option requested)
- Multiple language support with easy switching
- Filled/solid geometric shapes
- Curved arrows instead of straight only
- Multiple font selection from Google Fonts


### PDF Factory Plus

[App page](https://appshunter.io/ios/app/pdf-factory-plus/id1663406658)

This app offers a comprehensive suite of local PDF processing tools, ensuring your files remain secure and private. It provides intuitive features for editing, converting, merging, and protecting PDF documents without requiring an internet connection or account creation.

**Highlights:** Local PDF processing for enhanced security, Password protection and decryption, Page deletion and extraction, Merge multiple PDFs, Image and XPS to PDF conversion, PDF repair and linearization, PDF to scanned file conversion

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Factory Plus | Free | one-time |


## Frequently asked questions

### Is iMark · Image Annotation Tool free?

iMark · Image Annotation Tool is free to download, with in-app purchases available.

### Is PDF Factory Plus free?

PDF Factory Plus is free to download, with in-app purchases available.

### Which has better reviews, iMark · Image Annotation Tool or PDF Factory Plus?

PDF Factory Plus is rated higher. iMark · Image Annotation Tool averages 4.6 out of 5 from 381 ratings, while PDF Factory Plus averages 4.7 from 10 ratings.

### Do iMark · Image Annotation Tool or PDF Factory Plus have ads?

Neither iMark · Image Annotation Tool nor PDF Factory Plus shows ads.

### Which is updated more often, iMark · Image Annotation Tool or PDF Factory Plus?

iMark · Image Annotation Tool ships an update every 2 months, and PDF Factory Plus every 26 months. Most recently, iMark · Image Annotation Tool was updated on September 22, 2026 and PDF Factory Plus on June 1, 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.*