# Bolt Length vs TorinoCal

The clearest difference is ads: TorinoCal at none against Bolt Length's shown. TorinoCal also leads on update cadence (every 9 days vs every 20 months). Bolt Length's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 18.6). On price and in-app purchases there is nothing between them.

Both are free to download. Bolt Length sells 1 one-off in-app purchase and TorinoCal sells 1 in-app purchase, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.

Bolt Length ships an update every 20 months, TorinoCal every 9 days. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Bolt Length | TorinoCal |
| --- | --- | --- |
| 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 | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 8 MB |
| Requires iOS | **14.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Toru Kokuba](https://appshunter.io/developer/1816411281) |

## 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 |


### TorinoCal

[App page](https://appshunter.io/ios/app/torinocal/id6746357149)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Plan | $14.99 | per year |


## Frequently asked questions

### Is Bolt Length free?

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

### Is TorinoCal free?

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

### Do Bolt Length or TorinoCal have ads?

Bolt Length shows ads; TorinoCal does not.

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

Bolt Length ships an update every 20 months, and TorinoCal every 9 days. Most recently, Bolt Length was updated on October 8, 2026 and TorinoCal on October 25, 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.*