# Fluid Mechanics Calculator vs iS7

The clearest difference is price: Fluid Mechanics Calculator at $2.99 against iS7's $14.99. Fluid Mechanics Calculator also leads on in-app purchases (none vs 1) and iOS requirement (16.1 vs 26.0). On update cadence, ads and device support there is nothing between them.

Fluid Mechanics Calculator costs $2.99 and iS7 $14.99 up front. iS7 sells 1 one-off in-app purchase. Fluid Mechanics Calculator asks for nothing beyond the download.

Fluid Mechanics Calculator ships an update every 7 months, iS7 every 6 months. The most recent releases landed on November 4, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Fluid Mechanics Calculator | iS7 |
| --- | --- | --- |
| Price | **$2.99** | $14.99 |
| Rating | **[4.5 (21 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calculator/id526974981/reviews)** | — |
| Number of ratings | **21** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 months** |
| Monetization | Paid | — |
| Size | 11 MB | 9 MB |
| Requires iOS | **16.1** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Carlo Trotti](https://appshunter.io/developer/594070838) |

## What reviewers say

### Fluid Mechanics Calculator

[App page](https://appshunter.io/ios/app/fluid-mechanics-calculator/id526974981)

This app provides 97 calculators for fluid mechanics and civil engineering parameters. It supports both Imperial (USCS) and Metric (SI) units, offering automatic and accurate calculations with unit changes.

**Highlights:** 97 fluid mechanics and civil engineering calculators, Supports SI and USCS (Imperial) units, Automatic calculations with unit changes, Wide range of parameters covered, Civil engineering applications

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

**In-app purchases:** none


### iS7

[App page](https://appshunter.io/ios/app/is7/id594070835)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Alarms | $2.99 | one-time |


## Frequently asked questions

### Is Fluid Mechanics Calculator free?

Fluid Mechanics Calculator costs $2.99, with no in-app purchases.

### Is iS7 free?

iS7 costs $14.99, and also offers in-app purchases.

### Do Fluid Mechanics Calculator or iS7 have ads?

Neither Fluid Mechanics Calculator nor iS7 shows ads.

### Which is updated more often, Fluid Mechanics Calculator or iS7?

Fluid Mechanics Calculator ships an update every 7 months, and iS7 every 6 months. Most recently, Fluid Mechanics Calculator was updated on November 4, 2026 and iS7 on November 1, 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.*