# Bolt Thread Identifier vs Thread Gauge

The clearest difference is rating: Thread Gauge at 5.0 against Bolt Thread Identifier's 2.3. Thread Gauge also leads on update cadence (every 6 days vs every 11 months) and iOS requirement (17.6 vs 26.0). Bolt Thread Identifier's advantage is monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

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

Thread Gauge holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Bolt Thread Identifier ships an update every 11 months, Thread Gauge every 6 days. The most recent releases landed on September 20, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Bolt Thread Identifier | Thread Gauge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/bolt-thread-identifier/id6468966021/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thread-gauge/id6781018381/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 58 MB | 4 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Geared Design Consulting L.L.C.](https://appshunter.io/developer/1732325276) | [Imad Jawad](https://appshunter.io/developer/6781018383) |

## What reviewers say

### Bolt Thread Identifier

[App page](https://appshunter.io/ios/app/bolt-thread-identifier/id6468966021)

Identify bolt thread pitches by taking a photo. This app uses AI to match SAE-UNC, SAE-UNF, or metric pitches after a simple distance calibration. It's a handy tool for anyone working with fasteners.

**Highlights:** Photo-based thread pitch measurement, AI-driven pitch matching, Supports SAE-UNC, SAE-UNF, and metric threads, Simple distance calibration, Useful for fabricators and mechanics

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Bolt Thread Identifier free?

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

### Is Thread Gauge free?

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

### Which has better reviews, Bolt Thread Identifier or Thread Gauge?

Thread Gauge is rated higher. Bolt Thread Identifier averages 2.3 out of 5 from 3 ratings, while Thread Gauge averages 5.0 from 1 ratings.

### Do Bolt Thread Identifier or Thread Gauge have ads?

Neither Bolt Thread Identifier nor Thread Gauge shows ads.

### Which is updated more often, Bolt Thread Identifier or Thread Gauge?

Bolt Thread Identifier ships an update every 11 months, and Thread Gauge every 6 days. Most recently, Bolt Thread Identifier was updated on September 20, 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.*