# Pressure Vessel Pro vs Acceleration Calculator Plus

The clearest difference is update cadence: Pressure Vessel Pro at every 5 months against Acceleration Calculator Plus's every 20 months. Pressure Vessel Pro also leads on iOS requirement (12.0 vs 17.6). Acceleration Calculator Plus's advantage is price ($2.99 vs $5.99). On ads, in-app purchases and device support there is nothing between them.

Pressure Vessel Pro costs $5.99 and Acceleration Calculator Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pressure Vessel Pro ships an update every 5 months, Acceleration Calculator Plus every 20 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Pressure Vessel Pro | Acceleration Calculator Plus |
| --- | --- | --- |
| Price | $5.99 | **$2.99** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 20 months |
| Monetization | Paid | — |
| Size | 10 MB | 1 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Pressure Vessel Pro

[App page](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875)

Perform essential pressure vessel stress calculations with ease. Input dimensions for various tank geometries and instantly get results, including detailed formulae and ASME code compliance. Generate and share PDF reports with schematics.

**Highlights:** Pressure vessel stress calculations, ASME Boiler & Pressure Vessel Code compliance, Support for vertical, horizontal, and spherical tanks, Component stress calculations (cylinders, heads), Generate and share PDF reports, Flexible unit system (Metric/English), Save multiple calculation cases

**Features:** Vision Pro support

**In-app purchases:** none


### Acceleration Calculator Plus

[App page](https://appshunter.io/ios/app/acceleration-calculator-plus/id1658922875)

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

**In-app purchases:** none


## Frequently asked questions

### Is Pressure Vessel Pro free?

Pressure Vessel Pro costs $5.99, with no in-app purchases.

### Is Acceleration Calculator Plus free?

Acceleration Calculator Plus costs $2.99, with no in-app purchases.

### Do Pressure Vessel Pro or Acceleration Calculator Plus have ads?

Neither Pressure Vessel Pro nor Acceleration Calculator Plus shows ads.

### Which is updated more often, Pressure Vessel Pro or Acceleration Calculator Plus?

Pressure Vessel Pro ships an update every 5 months, and Acceleration Calculator Plus every 20 months. Most recently, Pressure Vessel Pro was updated on November 1, 2026 and Acceleration Calculator Plus on November 3, 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.*