# Bolt Length vs PVVS

The clearest difference is in-app purchases: PVVS at none against Bolt Length's 1. PVVS also leads on update cadence (every 2 months vs every 20 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Bolt Length ships an update every 20 months, PVVS every 2 months. The most recent releases landed on August 2, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Bolt Length | PVVS |
| --- | --- | --- |
| 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 | Yes |
| Update frequency | Every 20 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 7 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [sigeyosi kanenishi](https://appshunter.io/developer/629958778) |

## 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 |


### PVVS

[App page](https://appshunter.io/ios/app/pvvs/id1476646663)

**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 PVVS free?

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

### Do Bolt Length or PVVS have ads?

Both Bolt Length and PVVS show ads.

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

Bolt Length ships an update every 20 months, and PVVS every 2 months. Most recently, Bolt Length was updated on August 2, 2026 and PVVS on September 8, 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.*