# Astable vs CalculateVolumePro

The clearest difference is price: CalculateVolumePro at Free against Astable's $4.99. CalculateVolumePro also leads on update cadence (weekly vs every 2 weeks). Astable's advantage is in-app purchases (none vs 1) and device support (4 vs 2). On ads there is nothing between them.

CalculateVolumePro is free to download; Astable costs $4.99 up front. CalculateVolumePro sells 1 one-off in-app purchase. Astable asks for nothing beyond the download.

Astable ships an update every 2 weeks, CalculateVolumePro weekly. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Astable | CalculateVolumePro |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Paid | — |
| Size | 35 MB | 3 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [家豪 鲁](https://appshunter.io/developer/1665801193) | [Maxime Haeyaert](https://appshunter.io/developer/1274130669) |

## What reviewers say

### Astable

[App page](https://appshunter.io/ios/app/astable-structural-mechanics/id1665840344)

This application provides a powerful structural mechanics solver with a graphic editor, code editor, and workspace. It allows for detailed mechanics parameter settings and offers a rich theme color scheme, making it ideal for large screen devices.

**Highlights:** Graphic editor, Code editor, Workspace, Mechanics parameter settings, Rich theme color scheme, Large screen device optimized

**Features:** Vision Pro support

**In-app purchases:** none


### CalculateVolumePro

[App page](https://appshunter.io/ios/app/calculatevolumepro/id6737241011)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Detailed calculations | $0.99 | one-time |


## Frequently asked questions

### Is Astable free?

Astable costs $4.99, with no in-app purchases.

### Is CalculateVolumePro free?

CalculateVolumePro is free to download, with in-app purchases available.

### Do Astable or CalculateVolumePro have ads?

Neither Astable nor CalculateVolumePro shows ads.

### Which is updated more often, Astable or CalculateVolumePro?

Astable ships an update every 2 weeks, and CalculateVolumePro weekly. Most recently, Astable was updated on October 7, 2026 and CalculateVolumePro on October 25, 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.*