# pdf vs Kiu

The clearest difference is ads: Kiu at none against pdf's shown. pdf's advantage is iOS requirement (16.0 vs 18.2). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. pdf sells 3 one-off in-app purchases and Kiu sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | pdf | Kiu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (23 ratings)](https://appshunter.io/ios/app/pdf-notes-for-ipad-ads/id391487223/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 68.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 141 MB | 81 MB |
| Requires iOS | **16.0** | 18.2 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [AMuseTec Co., Ltd.](https://appshunter.io/developer/342152781) | [Matias Jarquez Ahucha](https://appshunter.io/developer/1885239466) |

## What reviewers say

### pdf

[App page](https://appshunter.io/ios/app/pdf-notes-for-ipad-ads/id391487223)

Manage and annotate PDF files on your iPad with fast page turning and intuitive finger-writing. Easily import PDFs, organize them into bookshelves, and export annotated versions via email. Features include zoom, cropping, and multiple pen options.

**Highlights:** Fast page turning and scanning, Intuitive finger-writing and annotation, Easy PDF import via Dropbox, Email, iTunes, Categorized bookshelves with search, Export annotated PDFs via email, Pinch zoom and crop page margins

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2-Month Pass | $0.99 | one-time |
| 1-Year Pass | $4.99 | one-time |
| Lifetime License | $9.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy to use
- 🚀 Fast and responsive
- 💡 Great annotation tools
- 🔒 Secure and reliable
- 📚 Excellent for students and academics

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 💸 Expensive paid version
- 📤 Difficulty exporting annotated PDFs
- 🔍 Lack of search functionality
- 🖍️ Inconsistent behavior of highlighting and erasing

**Reported bugs**

- Annotated PDFs losing data during export
- Crashes after recent app updates
- Inconsistent behavior when switching between apps
- Incorrect page numbering and navigation

**Requested features**

- Add text typing and editing capabilities
- Implement a table of contents feature
- Improve integration with cloud storage services
- Allow custom organization of PDF files
- Enhance the note-taking experience


### Kiu

[App page](https://appshunter.io/ios/app/kiu-habit-tracker/id6789227387)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kiu Pro – Monthly | $2.99 | per month |
| Kiu Pro – Yearly | $12.99 | per year |
| Kiu Pro – Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is pdf free?

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

### Is Kiu free?

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

### Do pdf or Kiu have ads?

pdf shows ads; Kiu does not.

### Which is updated more often, pdf or Kiu?

pdf ships an update every 3 weeks, and Kiu every 3 weeks. Most recently, pdf was updated on October 22, 2026 and Kiu on October 25, 2026.

---

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