# Viscosity Conversion vs Pressure Vessel Thickness

The clearest difference is iOS requirement: Viscosity Conversion at 13 against Pressure Vessel Thickness's 16.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Viscosity Conversion costs $2.99 and Pressure Vessel Thickness $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Viscosity Conversion ships an update every 30 months, Pressure Vessel Thickness every 56 months. The most recent releases landed on September 23, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | Viscosity Conversion | Pressure Vessel Thickness |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 30 months** | Every 56 months |
| Monetization | — | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | **13** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

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

**In-app purchases:** none


### Pressure Vessel Thickness

[App page](https://appshunter.io/ios/app/pressure-vessel-thickness/id1492098075)

Calculate the required design and nominal thickness for various pressure vessel components according to ASME Section VIII Div 1 codes. This tool assists designers in determining the necessary thickness for shell, hemispherical, torispherical, ellipsoidal, and conical heads under internal pressure.

**Highlights:** Calculate design thickness, Calculate nominal thickness, Shell thickness calculation, Head thickness calculation (Hemi, Tori, Ellipsoidal), Cone thickness calculation, ASME Section VIII Div 1 compliance

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

**In-app purchases:** none


## Frequently asked questions

### Is Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Is Pressure Vessel Thickness free?

Pressure Vessel Thickness costs $2.99, with no in-app purchases.

### Do Viscosity Conversion or Pressure Vessel Thickness have ads?

Neither Viscosity Conversion nor Pressure Vessel Thickness shows ads.

### Which is updated more often, Viscosity Conversion or Pressure Vessel Thickness?

Viscosity Conversion ships an update every 30 months, and Pressure Vessel Thickness every 56 months. Most recently, Viscosity Conversion was updated on September 23, 2026 and Pressure Vessel Thickness on August 24, 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.*