# Compressible Gas Flow Calc vs Turbo Forms

The clearest difference is price: Turbo Forms at Free against Compressible Gas Flow Calc's $3.99. Turbo Forms also leads on update cadence (every 5 weeks vs every 12 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Turbo Forms is free to download; Compressible Gas Flow Calc costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Compressible Gas Flow Calc ships an update every 12 months, Turbo Forms every 5 weeks. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Compressible Gas Flow Calc | Turbo Forms |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/compressible-gas-flow-calc/id900600984/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 54 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Niagara Mobile LLC](https://appshunter.io/developer/1039399999) | [Unvired Inc](https://appshunter.io/developer/964396953) |

## What reviewers say

### Compressible Gas Flow Calc

[App page](https://appshunter.io/ios/app/compressible-gas-flow-calc/id900600984)

Calculates pressure drops and flow rates for compressible gas flow in pipes. Offers three modes: calculate inlet pressure, outlet pressure, or flow rate. Supports custom pipe sizes and a database of over 20 gases.

**Highlights:** Calculate inlet pressure, Calculate outlet pressure, Calculate flow rate, Standard and custom pipe sizes, Database of 20+ gases, Imperial or SI units

**Features:** macOS Compatibility

**In-app purchases:** none


### Turbo Forms

[App page](https://appshunter.io/ios/app/turbo-forms-digital-forms/id1487793600)

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

**In-app purchases:** none


## Frequently asked questions

### Is Compressible Gas Flow Calc free?

Compressible Gas Flow Calc costs $3.99, with no in-app purchases.

### Is Turbo Forms free?

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

### Do Compressible Gas Flow Calc or Turbo Forms have ads?

Neither Compressible Gas Flow Calc nor Turbo Forms shows ads.

### Which is updated more often, Compressible Gas Flow Calc or Turbo Forms?

Compressible Gas Flow Calc ships an update every 12 months, and Turbo Forms every 5 weeks. Most recently, Compressible Gas Flow Calc was updated on October 11, 2026 and Turbo Forms on October 25, 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.*