# Bolt Length vs Simpliinspect

The clearest difference is in-app purchases: Simpliinspect at none against Bolt Length's 1. Simpliinspect also leads on ads (none vs shown) and update cadence (every 3 weeks 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. Simpliinspect asks for nothing beyond the download.

Bolt Length ships an update every 20 months, Simpliinspect every 3 weeks. The most recent releases landed on October 8, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Bolt Length | Simpliinspect |
| --- | --- | --- |
| 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 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 33 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [SIMPLIBIZZ TECHNOLOGIES PRIVATE LIMITED](https://appshunter.io/developer/1681771070) |

## 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 |


### Simpliinspect

[App page](https://appshunter.io/ios/app/simpliinspect/id6448033498)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bolt Length free?

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

### Is Simpliinspect free?

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

### Do Bolt Length or Simpliinspect have ads?

Bolt Length shows ads; Simpliinspect does not.

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

Bolt Length ships an update every 20 months, and Simpliinspect every 3 weeks. Most recently, Bolt Length was updated on October 8, 2026 and Simpliinspect on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*