Bolt Length vs PVVS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bolt Length
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.
- Metric coarse screw length calculation
- Conforms to Japanese Industrial Standards (JIS)
- Designed for mechanical design
- User risk disclaimer
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This app is an application for calculating the length of the screw. ※:This app does not guarantee the effectiveness of the combination. ※:Use this application at your own risk. Conforms to the Japanese Industrial Standards (JIS). Screws are all metric coarse screw. For mechanical design. Sorry, Only in Japan.Because using the JIS.
PVVS
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成型鏡板＋円筒胴による容器の容積、表面積、設定水位における容量を求めることができるアプリです。 容器の板厚と素材の比重を設定して容器の空重量を求めることもできます。また、溶接構造による容器の場合は3点のパーツ（上部鏡板A,胴板L,下部鏡板B）に分けて各部毎に板厚、フランジ長さを個別に設定し重量、容量を精査できます。 さらに、簡易強度計算機能もあり、設計圧力(内圧のみ）と使用材料の許容引張応力（設計温度による）から計算板厚を求めることもできます。 このアプリケーションソフト（ＰＶＶＳ）のご使用は全て利用者の自己責任において行うものとします。 本アプリケーションソフトを運用した結果生じた損害について、作者は一切の責任を負わないものとします。
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Bolt Length | PVVS |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 20 months | Every 2 months — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 6 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | mitsunori oishi | sigeyosi kanenishi |
In-app purchases
Bolt Length
- Hide Ads$1.99
PVVS
No in-app purchases
