# Thread Gauge vs Write on PDF

The clearest difference is in-app purchases: Thread Gauge at none against Write on PDF's 3. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Write on PDF sells 3 in-app purchases, starting at $4.99 per 7 days. Thread Gauge asks for nothing beyond the download.

## The numbers

| Metric | Thread Gauge | Write on PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/thread-gauge/id6781018381/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 22 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Imad Jawad](https://appshunter.io/developer/6781018383) | [Fenuku Kekeli](https://appshunter.io/developer/1822419894) |

## What reviewers say

### Thread Gauge

[App page](https://appshunter.io/ios/app/thread-gauge/id6781018381)

This app transforms your iPhone into a precise thread measurement tool. Simply photograph a screw next to a reference card to accurately determine its pitch and diameter, identifying the closest standard in both metric and imperial units.

**Highlights:** Measures metric and imperial threads, Identifies closest standard match, Uses reference card for scale, On-screen guidance for photography, Offline processing, no data tracking

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

**In-app purchases:** none


### Write on PDF

[App page](https://appshunter.io/ios/app/write-on-pdf-edit-and-annotate/id6801932711)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access for a week | $4.99 | per 7 days |
| All Access for a year | $39.99 | per year |
| All Access | $99.99 | one-time |


## Frequently asked questions

### Is Thread Gauge free?

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

### Is Write on PDF free?

Write on PDF is free to download, with in-app purchases available.

### Do Thread Gauge or Write on PDF have ads?

Neither Thread Gauge nor Write on PDF shows ads.

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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.*