# i vs Bolt Thread Identifier

The clearest difference is rating: i at 2.6 against Bolt Thread Identifier's 2.3. i also leads on ratings volume (9 vs 3) and iOS requirement (16.0 vs 26.0). On price, review sentiment, update cadence and ads there is nothing between them.

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

i holds the better App Store score, 2.6 against 2.3. Both are backed by a comparable volume of ratings — 9 and 3 respectively. Written reviews split almost evenly too, at 33% and 33% positive.

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

## The numbers

| Metric | i | Bolt Thread Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (9 ratings)](https://appshunter.io/ios/app/i-machinist/id1456473668/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/bolt-thread-identifier/id6468966021/reviews) |
| Number of ratings | **9** | 3 |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 11 months** |
| Monetization | Free | Free |
| Size | 8 MB | 58 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ilan TETRUASHVILI](https://appshunter.io/developer/940821251) | [Geared Design Consulting L.L.C.](https://appshunter.io/developer/1732325276) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-machinist/id1456473668)

This utility app assists machinists with CNC calculations, including cutting speed, RPM, and feed rate. It also provides databases for hole and shaft tolerances, as well as detailed thread specifications.

**Highlights:** Cutting speed calculation, RPM calculation, Feed rate calculation, Hole and shaft tolerance database, Thread data, Milling, drilling, and turning operations

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is i free?

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

### Is Bolt Thread Identifier free?

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

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

i is rated higher. i averages 2.6 out of 5 from 9 ratings, while Bolt Thread Identifier averages 2.3 from 3 ratings.

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

Neither i nor Bolt Thread Identifier shows ads.

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

i ships an update every 16 months, and Bolt Thread Identifier every 11 months. Most recently, i was updated on September 16, 2026 and Bolt Thread Identifier on September 20, 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.*