# Tank Partial Volume Calculator vs mechanical design engine

The clearest difference is price: mechanical design engine at Free against Tank Partial Volume Calculator's $2.99. mechanical design engine also leads on update cadence (every 2 months vs every 56 months) and iOS requirement (13.0 vs 16.1). On ads, in-app purchases and device support there is nothing between them.

mechanical design engine is free to download; Tank Partial Volume Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tank Partial Volume Calculator ships an update every 56 months, mechanical design engine every 2 months. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Tank Partial Volume Calculator | mechanical design engine |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 56 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 1 MB | 63 MB |
| Requires iOS | 16.1 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### Tank Partial Volume Calculator

[App page](https://appshunter.io/ios/app/tank-partial-volume-calculator/id1491608421)

Calculate the partial and full volume of horizontal and vertical tanks with various head types. This tool is designed for engineers to determine liquid volumes at any height, simplifying capacity calculations for storage tanks and pressure vessels.

**Highlights:** Horizontal and vertical tank volume calculation, Supports flat, torispherical, hemispherical, and ellipsoidal heads, Calculates full volume, Determines liquid volume at any height, Outputs in cubic meters, liters, and gallons, Input in millimeters or metric system

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tank Partial Volume Calculator free?

Tank Partial Volume Calculator costs $2.99, with no in-app purchases.

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do Tank Partial Volume Calculator or mechanical design engine have ads?

Neither Tank Partial Volume Calculator nor mechanical design engine shows ads.

### Which is updated more often, Tank Partial Volume Calculator or mechanical design engine?

Tank Partial Volume Calculator ships an update every 56 months, and mechanical design engine every 2 months. Most recently, Tank Partial Volume Calculator was updated on October 1, 2026 and mechanical design engine on October 11, 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.*