# VIN Decoder Pro vs Thread Gauge

The clearest difference is in-app purchases: Thread Gauge at none against VIN Decoder Pro's 2. Thread Gauge also leads on ads (none vs shown) and update cadence (every 6 days vs every 6 weeks). VIN Decoder Pro's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.6). On price there is nothing between them.

Both are free to download. VIN Decoder Pro sells 2 one-off in-app purchases. Thread Gauge asks for nothing beyond the download.

VIN Decoder Pro ships an update every 6 weeks, Thread Gauge every 6 days. The most recent releases landed on September 15, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | VIN Decoder Pro | Thread Gauge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thread-gauge/id6781018381/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 6 days** |
| Monetization | — | Free with in-app purchases |
| Size | 39 MB | 4 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tran Hoa](https://appshunter.io/developer/1413218457) | [Imad Jawad](https://appshunter.io/developer/6781018383) |

## What reviewers say

### VIN Decoder Pro

[App page](https://appshunter.io/ios/app/vin-decoder-pro/id6740048109)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donate for developer | $0.99 | one-time |
| PACKAGE HIDE ADS | $3.99 | one-time |


### 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


## Frequently asked questions

### Is VIN Decoder Pro free?

VIN Decoder Pro is free to download, with in-app purchases available.

### Is Thread Gauge free?

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

### Do VIN Decoder Pro or Thread Gauge have ads?

VIN Decoder Pro shows ads; Thread Gauge does not.

### Which is updated more often, VIN Decoder Pro or Thread Gauge?

VIN Decoder Pro ships an update every 6 weeks, and Thread Gauge every 6 days. Most recently, VIN Decoder Pro was updated on September 15, 2026 and Thread Gauge on August 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.*