# Inkflow Visual Notebook vs Acknowledgement Book

The clearest difference is in-app purchases: Acknowledgement Book at none against Inkflow Visual Notebook's 3. Acknowledgement Book also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Inkflow Visual Notebook sells 3 in-app purchases, starting at $1.99 per month. Acknowledgement Book asks for nothing beyond the download.

Inkflow Visual Notebook ships an update every 5 months, Acknowledgement Book every 6 months. The most recent releases landed on October 18, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Inkflow Visual Notebook | Acknowledgement Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.9K ratings)](https://appshunter.io/ios/app/inkflow-visual-notebook/id519524685/reviews)** | — |
| Number of ratings | **1.9K** | — |
| Positive reviews | 71.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 58 MB | 22 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Qrayon, LLC](https://appshunter.io/developer/354980265) | [Abhinav Swami](https://appshunter.io/developer/1794297635) |

## What reviewers say

### Inkflow Visual Notebook

[App page](https://appshunter.io/ios/app/inkflow-visual-notebook/id519524685)

This app offers a fluid digital writing and sketching experience, allowing users to easily capture, resize, and reorganize ideas. It supports high-resolution zooming for detailed work and integrates text, photos, and custom paper backgrounds. Users can share their creations in various formats.

**Highlights:** Fluid digital ink for writing and sketching, Resize and reorganize content with touch gestures, High-resolution zoom for precision detail, Insert text, photos, and custom paper backgrounds, Export to PDF, JPEG, and PNG, Inkport for scanning real-world notes

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Inkflow Plus Monthly Subscription | $1.99 | per month |
| Inkflow Plus Annual Subscription | $12.99 | per year |
| Inkflow Plus | $19.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Intuitive interface
- 💡 Great for brainstorming and sketching
- 👍 Useful for note-taking and journaling
- 👍 Versatile for various purposes (work, school, art)

**What reviewers complain about**

- 🔒 Limited features in free version
- 💰 Paid upgrade is expensive for some users
- 🐛 Occasional crashes and data loss issues
- 🔒 Lack of cloud sync and cross-device access
- 🔒 Difficult to organize and manage notebooks/pages

**Reported bugs**

- Frequent crashes and data loss
- Unreliable auto-save and syncing
- Compatibility issues with newer devices/OS
- Pen/input lag and inconsistent responsiveness

**Requested features**

- Add more pen/brush options and customization
- Implement layers and advanced drawing tools
- Improve page management (insert, delete, reorder)
- Integrate cloud sync and cross-device access
- Add password protection and locking features


### Acknowledgement Book

[App page](https://appshunter.io/ios/app/acknowledgement-book/id6743952653)

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

**In-app purchases:** none


## Frequently asked questions

### Is Inkflow Visual Notebook free?

Inkflow Visual Notebook is free to download, with in-app purchases available.

### Is Acknowledgement Book free?

Acknowledgement Book is free to download, with no in-app purchases.

### Do Inkflow Visual Notebook or Acknowledgement Book have ads?

Inkflow Visual Notebook shows ads; Acknowledgement Book does not.

### Which is updated more often, Inkflow Visual Notebook or Acknowledgement Book?

Inkflow Visual Notebook ships an update every 5 months, and Acknowledgement Book every 6 months. Most recently, Inkflow Visual Notebook was updated on October 18, 2026 and Acknowledgement Book on October 10, 2026.

---

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