# Bolt Length vs Integrity Assured

The clearest difference is in-app purchases: Integrity Assured at none against Bolt Length's 1. Integrity Assured also leads on ads (none vs shown). Bolt Length's advantage is iOS requirement (14.0 vs 17.0). On price, update cadence and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 20 months. The most recent releases landed on October 8, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Bolt Length | Integrity Assured |
| --- | --- | --- |
| 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 20 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 173 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [Enerpac](https://appshunter.io/developer/1614468160) |

## 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 |


### Integrity Assured

[App page](https://appshunter.io/ios/app/integrity-assured/id1669655495)

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

**In-app purchases:** none


## Frequently asked questions

### Is Bolt Length free?

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

### Is Integrity Assured free?

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

### Do Bolt Length or Integrity Assured have ads?

Bolt Length shows ads; Integrity Assured does not.

### Which is updated more often, Bolt Length or Integrity Assured?

Bolt Length ships an update every 20 months, and Integrity Assured every 20 months. Most recently, Bolt Length was updated on October 8, 2026 and Integrity Assured on October 27, 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.*