# Tank Volume Calculation vs Total Keys

The clearest difference is device support: Tank Volume Calculation at 3 against Total Keys's 1. Tank Volume Calculation also leads on iOS requirement (12.0 vs 18). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Tank Volume Calculation sells 1 one-off in-app purchase and Total Keys sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Tank Volume Calculation | Total Keys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/tank-volume-calculation/id6740401902/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Monetization | Free with in-app purchases | — |
| Size | 65 MB | 11 MB |
| Requires iOS | **12.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) | [Nghia Huynh Quang](https://appshunter.io/developer/1514165485) |

## What reviewers say

### Tank Volume Calculation

[App page](https://appshunter.io/ios/app/tank-volume-calculation/id6740401902)

Calculate the volume and weight of liquid in various tank shapes. Convert between units and save your results. Optimized for efficiency and ease of use.

**Highlights:** Volume calculations for various tank shapes, Liquid weight calculation with density, Built-in volume unit converter, Metric and imperial unit support, Save and share calculation results, Optimized for tablets and mobile

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $3.99 | one-time |


### Total Keys

[App page](https://appshunter.io/ios/app/total-keys/id6780955038)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pack | $2.99 | one-time |


## Frequently asked questions

### Is Tank Volume Calculation free?

Tank Volume Calculation is free to download, with in-app purchases available.

### Is Total Keys free?

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

### Do Tank Volume Calculation or Total Keys have ads?

Neither Tank Volume Calculation nor Total Keys shows ads.

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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.*