# eTAP vs Knot Tying 3D

The clearest difference is in-app purchases: eTAP at none against Knot Tying 3D's 1. eTAP also leads on iOS requirement (12.3 vs 16.0). Knot Tying 3D's advantage is update cadence (every 9 days vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Knot Tying 3D sells 1 one-off in-app purchase. eTAP asks for nothing beyond the download.

eTAP ships an update every 5 months, Knot Tying 3D every 9 days. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | eTAP | Knot Tying 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/knot-tying-3d/id6773546878/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 91 MB |
| Requires iOS | **12.3** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [4Tel Pty Ltd](https://appshunter.io/developer/1088707397) | [良 程](https://appshunter.io/developer/6773259834) |

## What reviewers say

### eTAP

[App page](https://appshunter.io/ios/app/etap/id1493871982)

**Features:** macOS Compatibility

**In-app purchases:** none


### Knot Tying 3D

[App page](https://appshunter.io/ios/app/knot-tying-3d/id6773546878)

Learn to tie a variety of knots with immersive 3D animations and step-by-step instructions. Covers fishing, camping, climbing, and daily use scenarios. Practice essential ropework skills anytime, anywhere, even offline.

**Highlights:** Immersive 3D knot animations, Step-by-step instructions, 7 life scenario categories, Smart search by name or usage, Offline learning capability, Resume learning progress

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全部教程永久解锁 | $2.99 | one-time |


## Frequently asked questions

### Is eTAP free?

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

### Is Knot Tying 3D free?

Knot Tying 3D is free to download, with in-app purchases available.

### Do eTAP or Knot Tying 3D have ads?

Neither eTAP nor Knot Tying 3D shows ads.

### Which is updated more often, eTAP or Knot Tying 3D?

eTAP ships an update every 5 months, and Knot Tying 3D every 9 days. Most recently, eTAP was updated on September 22, 2026 and Knot Tying 3D on September 16, 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.*