# Pressure Vessel Pro vs Bellows Design Software

The clearest difference is price: Bellows Design Software at Free against Pressure Vessel Pro's $5.99. Bellows Design Software also leads on rating (5.0 vs 4.5) and update cadence (monthly vs every 5 months). Pressure Vessel Pro's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 16.0). On ratings volume, ads and device support there is nothing between them.

Bellows Design Software is free to download; Pressure Vessel Pro costs $5.99 up front. Bellows Design Software sells 2 in-app purchases, starting at $34.99 per month. Pressure Vessel Pro asks for nothing beyond the download.

Bellows Design Software holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Pressure Vessel Pro ships an update every 5 months, Bellows Design Software monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Pressure Vessel Pro | Bellows Design Software |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bellows-design-software/id1635945221/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 10 MB | 26 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Pressure Vessel Pro

[App page](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875)

Perform essential pressure vessel stress calculations with ease. Input dimensions for various tank geometries and instantly get results, including detailed formulae and ASME code compliance. Generate and share PDF reports with schematics.

**Highlights:** Pressure vessel stress calculations, ASME Boiler & Pressure Vessel Code compliance, Support for vertical, horizontal, and spherical tanks, Component stress calculations (cylinders, heads), Generate and share PDF reports, Flexible unit system (Metric/English), Save multiple calculation cases

**Features:** Vision Pro support

**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 Pressure Vessel Pro free?

Pressure Vessel Pro costs $5.99, with no in-app purchases.

### Is Bellows Design Software free?

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

### Which has better reviews, Pressure Vessel Pro or Bellows Design Software?

Bellows Design Software is rated higher. Pressure Vessel Pro averages 4.5 out of 5 from 2 ratings, while Bellows Design Software averages 5.0 from 1 ratings.

### Do Pressure Vessel Pro or Bellows Design Software have ads?

Neither Pressure Vessel Pro nor Bellows Design Software shows ads.

### Which is updated more often, Pressure Vessel Pro or Bellows Design Software?

Pressure Vessel Pro ships an update every 5 months, and Bellows Design Software monthly. Most recently, Pressure Vessel Pro was updated on October 5, 2026 and Bellows Design Software on October 2, 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.*