# Lock Tool vs Bellows Design Software

The clearest difference is in-app purchases: Lock Tool at none against Bellows Design Software's 2. Lock Tool also leads on iOS requirement (12.0 vs 16.0). Bellows Design Software's advantage is update cadence (monthly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Bellows Design Software sells 2 in-app purchases, starting at $34.99 per month. Lock Tool asks for nothing beyond the download.

Lock Tool ships an update every 3 months, Bellows Design Software monthly. The most recent releases landed on September 13, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Lock Tool | Bellows Design Software |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bellows-design-software/id1635945221/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 19 MB | 26 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhixin Wulian Technology Co., Ltd.](https://appshunter.io/developer/1521588847) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Lock Tool

[App page](https://appshunter.io/ios/app/lock-tool/id1419601294)

**Features:** macOS Compatibility

**In-app purchases:** none


### Bellows Design Software

[App page](https://appshunter.io/ios/app/bellows-design-software/id1635945221)

This application assists in designing metallic bellows type expansion joints according to EJMA Standards. It allows users to input various design parameters and movement inputs to ensure safe and reliable usage. The software performs comprehensive calculations and checks against EJMA conditions for different bellows configurations and materials.

**Highlights:** Design metallic bellows expansion joints, Input internal diameter, convolution height, ply thickness, pitch, and number of plies, Set design pressure, temperature, and movements, Check design parameters against EJMA Standards, Calculations for single and dual bellows, Includes vibration and bellows forming methods, Calculations for tie rods, lugs plate, and hinges

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access for Bellows | $34.99 | per month |
| All Access for Bellows Design | $299.99 | per year |


## Frequently asked questions

### Is Lock Tool free?

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

### Is Bellows Design Software free?

Bellows Design Software is free to download, with in-app purchases available.

### Do Lock Tool or Bellows Design Software have ads?

Neither Lock Tool nor Bellows Design Software shows ads.

### Which is updated more often, Lock Tool or Bellows Design Software?

Lock Tool ships an update every 3 months, and Bellows Design Software monthly. Most recently, Lock Tool was updated on September 13, 2026 and Bellows Design Software on September 15, 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.*