# Bolt Length vs TMdrive

The clearest difference is in-app purchases: TMdrive at none against Bolt Length's 1. TMdrive also leads on ads (none vs shown) and update cadence (every 9 months vs every 20 months). On price and device support there is nothing between them.

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

Bolt Length ships an update every 20 months, TMdrive every 9 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Bolt Length | TMdrive |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 9 months** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 138 MB |
| Requires iOS | 14.0 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [東芝三菱電機産業システム株式会社(TMEIC)](https://appshunter.io/developer/1333406388) |

## 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 |


### TMdrive

[App page](https://appshunter.io/ios/app/tmdrive-e2-support/id1333406389)

**In-app purchases:** none


## Frequently asked questions

### Is Bolt Length free?

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

### Is TMdrive free?

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

### Do Bolt Length or TMdrive have ads?

Bolt Length shows ads; TMdrive does not.

### Which is updated more often, Bolt Length or TMdrive?

Bolt Length ships an update every 20 months, and TMdrive every 9 months. Most recently, Bolt Length was updated on November 2, 2026 and TMdrive on November 2, 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.*