# Bellows Design Software vs O

The clearest difference is in-app purchases: O at none against Bellows Design Software's 2. O also leads on iOS requirement (12.0 vs 16.0). Bellows Design Software's advantage is ads (none vs shown). On price, update cadence 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. O asks for nothing beyond the download.

Bellows Design Software ships an update monthly, O every 2 weeks. The most recent releases landed on September 15, 2026 and December 23, 2025 respectively.

## The numbers

| Metric | Bellows Design Software | O |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 52 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [O-Pitblast, Lda.](https://appshunter.io/developer/1190650181) |

## What reviewers say

### 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 |


### O

[App page](https://appshunter.io/ios/app/o/id1645853605)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bellows Design Software free?

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

### Is O free?

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

### Do Bellows Design Software or O have ads?

O shows ads; Bellows Design Software does not.

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

Bellows Design Software ships an update monthly, and O every 2 weeks. Most recently, Bellows Design Software was updated on September 15, 2026 and O on December 23, 2025.

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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.*