# Fluid Mechanics Calculator vs Graycode

The clearest difference is review sentiment: Graycode at 67% against Fluid Mechanics Calculator's 0%. Graycode also leads on iOS requirement (12.0 vs 16.1). Fluid Mechanics Calculator's advantage is rating (4.5 vs 3.0) and ratings volume (21 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Fluid Mechanics Calculator costs $2.99 and Graycode $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Fluid Mechanics Calculator holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Fluid Mechanics Calculator has 21 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 0% of Fluid Mechanics Calculator's written reviews are positive against 67% of Graycode's, so the app with the better star average is not the one people write more warmly about.

Fluid Mechanics Calculator ships an update every 7 months, Graycode every 10 months. The most recent releases landed on October 7, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Fluid Mechanics Calculator | Graycode |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | **[4.5 (21 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calculator/id526974981/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews) |
| Number of ratings | **21** | 2 |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 10 months |
| Monetization | Paid | Paid |
| Size | 11 MB | 2 MB |
| Requires iOS | 16.1 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) |

## 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


### Graycode

[App page](https://appshunter.io/ios/app/graycode/id548428653)

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

**Highlights:** Decimal, hex, binary, Gray code conversion, Real-time updates, Handy calculator for engineers, Animated Tower of Hanoi solution, Supports iPhone, iPad, iPod

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

**In-app purchases:** none


## Frequently asked questions

### Is Fluid Mechanics Calculator free?

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

### Is Graycode free?

Graycode costs $2.99, with no in-app purchases.

### Which has better reviews, Fluid Mechanics Calculator or Graycode?

Fluid Mechanics Calculator is rated higher. Fluid Mechanics Calculator averages 4.5 out of 5 from 21 ratings, while Graycode averages 3.0 from 2 ratings.

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

Neither Fluid Mechanics Calculator nor Graycode shows ads.

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

Fluid Mechanics Calculator ships an update every 7 months, and Graycode every 10 months. Most recently, Fluid Mechanics Calculator was updated on October 7, 2026 and Graycode on September 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*