# Hague Screw Thread Calculator vs Bolt Reader®

The clearest difference is rating: Bolt Reader® at 5.0 against Hague Screw Thread Calculator's 4.0. Hague Screw Thread Calculator's advantage is in-app purchases (none vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Bolt Reader® sells 1 one-off in-app purchase. Hague Screw Thread Calculator asks for nothing beyond the download.

Bolt Reader® holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 5 and 6 respectively.

Hague Screw Thread Calculator ships an update every 2 months, Bolt Reader® every 5 weeks. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Hague Screw Thread Calculator | Bolt Reader® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/hague-screw-thread-calculator/id853369162/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/bolt-reader/id1554066006/reviews)** |
| Number of ratings | 5 | **6** |
| Positive reviews | 82.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 6 MB | 24 MB |
| Requires iOS | 14.4 | **14.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hague Fasteners Ltd](https://appshunter.io/developer/853369165) | [Transmission Dynamics](https://appshunter.io/developer/1554066008) |

## What reviewers say

### Hague Screw Thread Calculator

[App page](https://appshunter.io/ios/app/hague-screw-thread-calculator/id853369162)

This engineering tool provides instant access to critical dimensions for various screw thread standards, including Unified, Whitworth, and ISO Metric. It also allows for the creation and calculation of custom thread sizes and pitches, eliminating the need for physical reference books.

**Highlights:** Unified screw thread data, Whitworth screw thread data, ISO Metric screw thread data, Custom thread calculator, Critical nominal dimensions

**Features:** macOS Compatibility

**In-app purchases:** none


### Bolt Reader®

[App page](https://appshunter.io/ios/app/bolt-reader/id1554066006)

This application provides users with real-time bolt tension data through intuitive bar graphs. It is specifically designed to work with Bolt-Cap Module devices from Transmission Dynamics, helping users quickly identify screws needing attention.

**Highlights:** Real-time bolt tension information, Bar graph data visualization, Identify screws requiring attention, Designed for Bolt-Cap Module devices, Works with Transmission Dynamics hardware

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $49.99 | one-time |


## Frequently asked questions

### Is Hague Screw Thread Calculator free?

Hague Screw Thread Calculator is free to download, with no in-app purchases.

### Is Bolt Reader® free?

Bolt Reader® is free to download, with in-app purchases available.

### Which has better reviews, Hague Screw Thread Calculator or Bolt Reader®?

Bolt Reader® is rated higher. Hague Screw Thread Calculator averages 4.0 out of 5 from 5 ratings, while Bolt Reader® averages 5.0 from 6 ratings.

### Do Hague Screw Thread Calculator or Bolt Reader® have ads?

Neither Hague Screw Thread Calculator nor Bolt Reader® shows ads.

### Which is updated more often, Hague Screw Thread Calculator or Bolt Reader®?

Hague Screw Thread Calculator ships an update every 2 months, and Bolt Reader® every 5 weeks. Most recently, Hague Screw Thread Calculator was updated on October 9, 2026 and Bolt Reader® on October 3, 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.*