# PDFToolbox vs 研词派

The clearest difference is in-app purchases: 研词派 at none against PDFToolbox's 3. On rating, ratings volume, update cadence and ads there is nothing between them.

On the App Store both sit at effectively the same score — 5.0 for PDFToolbox against 5.0 for 研词派. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

PDFToolbox ships an update every 7 months, 研词派 every 4 months. The most recent releases landed on October 13, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PDFToolbox | 研词派 |
| --- | --- | --- |
| Price | **Free** | — |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/pdftoolbox-converterwatermark/id6744648102/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/id6745506040/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 88 MB |
| Requires iOS | 15.0 | 15 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [钊辰 王](https://appshunter.io/developer/1791406641) | [浪 朱](https://appshunter.io/developer/1080897015) |

## What reviewers say

### PDFToolbox

[App page](https://appshunter.io/ios/app/pdftoolbox-converterwatermark/id6744648102)

This app offers a suite of tools for local PDF processing, including converting PDFs to images and vice versa, adding text watermarks, and encrypting/decrypting documents with passwords. It prioritizes user privacy by performing all operations on the device without internet access.

**Highlights:** Convert PDF to Image (JPG, PNG, GIF), Convert Image to PDF, Add custom text watermarks, Encrypt PDFs with passwords, Remove PDF password protection, Batch export and multi-image processing

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Yearly | $9.99 | per year |
| Lifetime | $29.99 | one-time |


### 研词派

[App page](https://appshunter.io/ios/app/id6745506040)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDFToolbox free?

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

### Is 研词派 free?

Pricing for 研词派 is not currently listed on the App Store.

### Which has better reviews, PDFToolbox or 研词派?

PDFToolbox and 研词派 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do PDFToolbox or 研词派 have ads?

Neither PDFToolbox nor 研词派 shows ads.

### Which is updated more often, PDFToolbox or 研词派?

PDFToolbox ships an update every 7 months, and 研词派 every 4 months. Most recently, PDFToolbox was updated on October 13, 2026 and 研词派 on October 30, 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.*