# INCHSTONE OPC Browser vs PDF Master

The clearest difference is update cadence: PDF Master at every 5 days against INCHSTONE OPC Browser's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

INCHSTONE OPC Browser ships an update every 3 months, PDF Master every 5 days. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | INCHSTONE OPC Browser | PDF Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 126 MB | 11 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [INCHSTONE GmbH](https://appshunter.io/developer/1480423246) | [Redania Studio Limited](https://appshunter.io/developer/1780784899) |

## What reviewers say

### INCHSTONE OPC Browser

[App page](https://appshunter.io/ios/app/inchstone-opc-browser/id6599836514)

**In-app purchases:** none


### PDF Master

[App page](https://appshunter.io/ios/app/pdf-master-viewer-and-create/id6755611875)

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

**In-app purchases:** none


## Frequently asked questions

### Is INCHSTONE OPC Browser free?

INCHSTONE OPC Browser is free to download, with no in-app purchases.

### Is PDF Master free?

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

### Do INCHSTONE OPC Browser or PDF Master have ads?

Neither INCHSTONE OPC Browser nor PDF Master shows ads.

### Which is updated more often, INCHSTONE OPC Browser or PDF Master?

INCHSTONE OPC Browser ships an update every 3 months, and PDF Master every 5 days. Most recently, INCHSTONE OPC Browser was updated on November 4, 2026 and PDF Master on November 5, 2026.

---

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