# PDFTool Lab vs Process Engineer Calc

The clearest difference is in-app purchases: Process Engineer Calc at none against PDFTool Lab's 1. Process Engineer Calc also leads on update cadence (every 10 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDFTool Lab sells 1 one-off in-app purchase. Process Engineer Calc asks for nothing beyond the download.

PDFTool Lab ships an update monthly, Process Engineer Calc every 10 days. The most recent releases landed on September 11, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | PDFTool Lab | Process Engineer Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Size | 66 MB | 11 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ASAPP STUDIO](https://appshunter.io/developer/1338092352) | [冯泰 蔡](https://appshunter.io/developer/1896641064) |

## What reviewers say

### PDFTool Lab

[App page](https://appshunter.io/ios/app/pdftool-lab/id6757402188)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDFTool Premium | $0.99 | one-time |


### Process Engineer Calc

[App page](https://appshunter.io/ios/app/process-engineer-calc-lms/id6774295442)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDFTool Lab free?

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

### Is Process Engineer Calc free?

Process Engineer Calc is free to download, with no in-app purchases.

### Do PDFTool Lab or Process Engineer Calc have ads?

Neither PDFTool Lab nor Process Engineer Calc shows ads.

### Which is updated more often, PDFTool Lab or Process Engineer Calc?

PDFTool Lab ships an update monthly, and Process Engineer Calc every 10 days. Most recently, PDFTool Lab was updated on September 11, 2026 and Process Engineer Calc on September 12, 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.*