# Knot Guide vs Personal Dosimetry Assistant

The clearest difference is price: Personal Dosimetry Assistant at Free against Knot Guide's $2.99. Personal Dosimetry Assistant also leads on in-app purchases (none vs 2) and iOS requirement (11.0 vs 17.0). On update cadence, ads and device support there is nothing between them.

Personal Dosimetry Assistant is free to download; Knot Guide costs $2.99 up front. Knot Guide sells 2 in-app purchases, starting at $2.99 per month. Personal Dosimetry Assistant asks for nothing beyond the download.

Knot Guide ships an update monthly, Personal Dosimetry Assistant every 2 months. The most recent releases landed on October 27, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Knot Guide | Personal Dosimetry Assistant |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.6 (451 ratings)](https://appshunter.io/ios/app/knot-guide/id293111210/reviews)** | — |
| Number of ratings | **451** | — |
| Positive reviews | 79.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 298 MB | 21 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Winkpass Creations, Inc.](https://appshunter.io/developer/288636661) | [Stroetenga Technologies B.V.](https://appshunter.io/developer/1564096411) |

## What reviewers say

### Knot Guide

[App page](https://appshunter.io/ios/app/knot-guide/id293111210)

Learn to tie a wide variety of essential knots with this comprehensive guide. It provides step-by-step instructions for over 200 knots, making it a valuable resource for DIY enthusiasts, outdoor adventurers, and anyone needing to master knot-tying techniques.

**Highlights:** Extensive knot library (202+ knots), Step-by-step instructions, Suitable for various uses, Practical DIY resource, Easy to follow

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knot Patron | $2.99 | per month |
| Yearly Knot Patron | $31.99 | per year |

**What reviewers like**

- 🌟 Great when free
- 👍 Clear instructions
- 📚 Comprehensive knot library
- 🔍 Easy to navigate
- 🗓️ Regularly updated

**What reviewers complain about**

- 💰 Expensive subscription model
- 🔒 Locking content behind paywall
- 🤔 Questionable business decisions
- 🏆 Devaluing previous purchases
- 🔍 Difficult to find specific knots

**Reported bugs**

- Paywall screen gets stuck
- Incompatibility with older devices

**Requested features**

- Add more aviation and climbing knots
- Provide more details on knot uses and strengths
- Allow offline access to all content


### Personal Dosimetry Assistant

[App page](https://appshunter.io/ios/app/personal-dosimetry-assistant/id1564096409)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Knot Guide free?

Knot Guide costs $2.99, and also offers in-app purchases.

### Is Personal Dosimetry Assistant free?

Personal Dosimetry Assistant is free to download, with no in-app purchases.

### Do Knot Guide or Personal Dosimetry Assistant have ads?

Neither Knot Guide nor Personal Dosimetry Assistant shows ads.

### Which is updated more often, Knot Guide or Personal Dosimetry Assistant?

Knot Guide ships an update monthly, and Personal Dosimetry Assistant every 2 months. Most recently, Knot Guide was updated on October 27, 2026 and Personal Dosimetry Assistant on October 11, 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.*