# pdf vs SiloSys Owner

The clearest difference is rating: SiloSys Owner at 5.0 against pdf's 3.9. SiloSys Owner also leads on in-app purchases (none vs 3) and ads (none vs shown). pdf's advantage is ratings volume (18 vs 2). On price, update cadence and device support there is nothing between them.

Both are free to download. pdf sells 3 one-off in-app purchases. SiloSys Owner asks for nothing beyond the download.

SiloSys Owner holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: pdf has 18 ratings behind it against 2, so its average is the more settled of the two.

pdf ships an update every 5 weeks, SiloSys Owner monthly. Both last shipped on October 20, 2026.

## The numbers

| Metric | pdf | SiloSys Owner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (18 ratings)](https://appshunter.io/ios/app/pdf-notes-for-iphone/id694946243/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/silosys-owner/id1438801134/reviews)** |
| Number of ratings | **18** | 2 |
| Positive reviews | 48.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 109 MB | 19 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AMuseTec Co., Ltd.](https://appshunter.io/developer/342152781) | [GrainChain](https://appshunter.io/developer/1438801133) |

## What reviewers say

### pdf

[App page](https://appshunter.io/ios/app/pdf-notes-for-iphone/id694946243)

This app allows you to read and annotate PDF files on your iPhone with fast page turning and convenient finger-writing tools. Easily import PDFs and share your notes via email or cloud services.

**Highlights:** Fast PDF display and page turning, Finger-writing and annotation tools, Import PDFs via Dropbox, Email, iTunes, Categorized bookshelves with search, Export annotated PDFs, Password-protected bookshelves

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2-Month Pass | $0.99 | one-time |
| 1-Year Path | $2.99 | one-time |
| Lifetime License | $4.99 | one-time |


### SiloSys Owner

[App page](https://appshunter.io/ios/app/silosys-owner/id1438801134)

Manage farm contracts and inventory with this cloud-based system. Digitize and automate business processes, eliminate manual data entry, and maintain accurate records. Works with new or existing farm equipment and sensors.

**Highlights:** Contract management, Inventory tracking, Automated business processes, Digital record keeping, Farm equipment integration, Cloud-based system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is pdf free?

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

### Is SiloSys Owner free?

SiloSys Owner is free to download, with no in-app purchases.

### Which has better reviews, pdf or SiloSys Owner?

SiloSys Owner is rated higher. pdf averages 3.9 out of 5 from 18 ratings, while SiloSys Owner averages 5.0 from 2 ratings.

### Do pdf or SiloSys Owner have ads?

pdf shows ads; SiloSys Owner does not.

### Which is updated more often, pdf or SiloSys Owner?

pdf ships an update every 5 weeks, and SiloSys Owner monthly. Most recently, pdf was updated on October 20, 2026 and SiloSys Owner on October 20, 2026.

---

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