# ThreadKing vs ZappID

The clearest difference is iOS requirement: ThreadKing at 8.1 against ZappID's 12.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ThreadKing ships an update every 6 days, ZappID every 4 days. The most recent releases landed on September 22, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | ThreadKing | ZappID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (12 ratings)](https://appshunter.io/ios/app/threadking/id1073753793/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 7 MB | 11 MB |
| Requires iOS | **8.1** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [Fredrik Petersson](https://appshunter.io/developer/555276018) |

## What reviewers say

### ThreadKing

[App page](https://appshunter.io/ios/app/threadking/id1073753793)

This app serves as a comprehensive reference and calculator for various thread types and dimensions. It provides detailed information on Metric and UN threads, including tap sizes and thread calculations for cutting and forming taps. Users can also find drill size charts and calculate RPM and feed rates for different materials.

**Highlights:** Metric and UN thread reference, Drill/Tap size charts, Pipe thread information, Cutting tap calculator, Forming tap calculator, RPM and feed rate calculator, Thread dimension details

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

**In-app purchases:** none


### ZappID

[App page](https://appshunter.io/ios/app/zappid/id1455029820)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ThreadKing free?

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

### Is ZappID free?

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

### Do ThreadKing or ZappID have ads?

Neither ThreadKing nor ZappID shows ads.

### Which is updated more often, ThreadKing or ZappID?

ThreadKing ships an update every 6 days, and ZappID every 4 days. Most recently, ThreadKing was updated on September 22, 2026 and ZappID on September 15, 2026.

---

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