# Bolt Thread Identifier vs Screw Identifier

The clearest difference is rating: Screw Identifier at 3.6 against Bolt Thread Identifier's 2.3. Screw Identifier also leads on update cadence (every 5 months vs every 11 months) and ratings volume (20 vs 3). Bolt Thread Identifier's advantage is in-app purchases (none vs 9) and review sentiment (33% vs 0%). On price, ads and device support there is nothing between them.

Both are free to download. Screw Identifier sells 8 in-app purchases, starting at $4.99 per 7 days. Bolt Thread Identifier asks for nothing beyond the download.

Screw Identifier holds the better App Store score, 3.6 against 2.3. That said, the two scores are not equally well evidenced: Screw Identifier has 20 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 33% of Bolt Thread Identifier's written reviews are positive against 0% of Screw Identifier's, so the app with the better star average is not the one people write more warmly about.

Bolt Thread Identifier ships an update every 11 months, Screw Identifier every 5 months. The most recent releases landed on September 20, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Bolt Thread Identifier | Screw Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/bolt-thread-identifier/id6468966021/reviews) | **[3.6 (20 ratings)](https://appshunter.io/ios/app/screw-identifier-bolt-id/id6759244718/reviews)** |
| Number of ratings | 3 | **20** |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 58 MB | 52 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Geared Design Consulting L.L.C.](https://appshunter.io/developer/1732325276) | [veysel yesilmen](https://appshunter.io/developer/1801211273) |

## 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


### Screw Identifier

[App page](https://appshunter.io/ios/app/screw-identifier-bolt-id/id6759244718)

Instantly identify screws, bolts, nuts, and washers using AI with a photo. Get precise specifications, measurements, and material details. Perfect for DIYers, contractors, and mechanics.

**Highlights:** AI-powered photo identification, Precise measurements and specs, Comprehensive fastener database, Smart size reference with calibration, AI assistant for fastener questions, History and report generation

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $4.99 | per 7 days |
| Get Premium Access | $4.99 | per 7 days |
| Premium Weekly | $4.99 | per 7 days |
| Premium Weekly | $5.99 | per 7 days |
| Get Premium Access | $19.99 | per year |
| Premium Yearly | $29.99 | per year |
| Premium Yearly | $39.99 | per year |
| Lifetime Access | $19.99 | one-time |


## Frequently asked questions

### Is Bolt Thread Identifier free?

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

### Is Screw Identifier free?

Screw Identifier is free to download, with in-app purchases available.

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

Screw Identifier is rated higher. Bolt Thread Identifier averages 2.3 out of 5 from 3 ratings, while Screw Identifier averages 3.6 from 20 ratings.

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

Neither Bolt Thread Identifier nor Screw Identifier shows ads.

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

Bolt Thread Identifier ships an update every 11 months, and Screw Identifier every 5 months. Most recently, Bolt Thread Identifier was updated on September 20, 2026 and Screw Identifier on September 11, 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.*