# Bolt Length vs BOX加工

The clearest difference is review sentiment: BOX加工 at 75% against Bolt Length's 33%. BOX加工 also leads on in-app purchases (none vs 1) and update cadence (every 5 months vs every 20 months). Bolt Length's advantage is iOS requirement (14.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Bolt Length sells 1 one-off in-app purchase. BOX加工 asks for nothing beyond the download.

Bolt Length ships an update every 20 months, BOX加工 every 5 months. The most recent releases landed on August 2, 2026 and June 20, 2026 respectively.

## The numbers

| Metric | Bolt Length | BOX加工 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/bolt-length-nominal-length/id1042345193/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 33.3% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 20 months | **Every 5 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 6 MB | 4 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Takahiro Ikejima](https://appshunter.io/developer/1528934187) |

## What reviewers say

### Bolt Length

[App page](https://appshunter.io/ios/app/bolt-length-nominal-length/id1042345193)

This application helps calculate the length of metric coarse screws based on Japanese Industrial Standards. It is designed for mechanical design purposes and should be used at the user's own risk.

**Highlights:** Metric coarse screw length calculation, Conforms to Japanese Industrial Standards (JIS), Designed for mechanical design, User risk disclaimer

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide Ads | $1.99 | one-time |


### BOX加工

[App page](https://appshunter.io/ios/app/box/id1528934185)

This app calculates optimal hole sizes for boxes, preventing them from shifting to one side. It provides standard opening sizes for various gauges and allows for custom settings. Designed for precision in box construction.

**Highlights:** Calculates hole sizes to prevent box shifting, Standard opening sizes for G16, G22, G28, G36, Customizable opening size settings, Precision tool for box construction

**In-app purchases:** none


## Frequently asked questions

### Is Bolt Length free?

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

### Is BOX加工 free?

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

### Do Bolt Length or BOX加工 have ads?

Both Bolt Length and BOX加工 show ads.

### Which is updated more often, Bolt Length or BOX加工?

Bolt Length ships an update every 20 months, and BOX加工 every 5 months. Most recently, Bolt Length was updated on August 2, 2026 and BOX加工 on June 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.*