# PDF vs 100 Notes Studio

The clearest difference is update cadence: 100 Notes Studio at every 2 days against PDF's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. PDF sells 3 in-app purchases, starting at $3.99 per month and 100 Notes Studio sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

PDF ships an update every 3 weeks, 100 Notes Studio every 2 days. The most recent releases landed on October 31, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | PDF | 100 Notes Studio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 12 MB | 19 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [爱华 刘](https://appshunter.io/developer/1797362038) | [Guan Feng Lai](https://appshunter.io/developer/1136144960) |

## What reviewers say

### PDF

[App page](https://appshunter.io/ios/app/pdf-pro-editor-and-scanner/id6797690967)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF-PRO Monthly | $3.99 | per month |
| PDF-PRO Yearly (3-Day Trial) | $24.99 | per year |
| PDF-PRO Lifetime Pass | $59.99 | one-time |


### 100 Notes Studio

[App page](https://appshunter.io/ios/app/100-notes-studio-pen-and-paper/id6798813048)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Studio | $5.99 | one-time |


## Frequently asked questions

### Is PDF free?

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

### Is 100 Notes Studio free?

100 Notes Studio is free to download, with in-app purchases available.

### Do PDF or 100 Notes Studio have ads?

Neither PDF nor 100 Notes Studio shows ads.

### Which is updated more often, PDF or 100 Notes Studio?

PDF ships an update every 3 weeks, and 100 Notes Studio every 2 days. Most recently, PDF was updated on October 31, 2026 and 100 Notes Studio on November 8, 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.*