# MUDSheet vs Gas Compressibility Factor Z

The clearest difference is update cadence: MUDSheet at every 2 months against Gas Compressibility Factor Z's every 8 months. MUDSheet also leads on iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MUDSheet ships an update every 2 months, Gas Compressibility Factor Z every 8 months. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | MUDSheet | Gas Compressibility Factor Z |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mudsheet/id1510513381/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free | — |
| Size | 18 MB | 3 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) | [Carlos Moura](https://appshunter.io/developer/407501202) |

## What reviewers say

### MUDSheet

[App page](https://appshunter.io/ios/app/mudsheet/id1510513381)

This app provides essential calculations and data for mud engineering. It distills critical information from various engineering resources into a convenient tool for mud and drilling engineers, offering quick access to equations and chemical formulas.

**Highlights:** Essential mud engineering calculations, Quick access to drilling equations, Chemical formulas and atomic table, Unit conversion and setup exchange, Input data validation, Multiple table references

**Features:** macOS Compatibility

**In-app purchases:** none


### Gas Compressibility Factor Z

[App page](https://appshunter.io/ios/app/gas-compressibility-factor-z/id1626924678)

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

**In-app purchases:** none


## Frequently asked questions

### Is MUDSheet free?

MUDSheet is free to download, with no in-app purchases.

### Is Gas Compressibility Factor Z free?

Gas Compressibility Factor Z is free to download, with no in-app purchases.

### Do MUDSheet or Gas Compressibility Factor Z have ads?

Neither MUDSheet nor Gas Compressibility Factor Z shows ads.

### Which is updated more often, MUDSheet or Gas Compressibility Factor Z?

MUDSheet ships an update every 2 months, and Gas Compressibility Factor Z every 8 months. Most recently, MUDSheet was updated on September 29, 2026 and Gas Compressibility Factor Z on October 7, 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.*