# Pressure Vessel Pro vs PIDTune

The clearest difference is review sentiment: PIDTune at 100% against Pressure Vessel Pro's 33%. PIDTune also leads on rating (5.0 vs 4.5) and price ($4.99 vs $5.99). Pressure Vessel Pro's advantage is iOS requirement (12.0 vs 15.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Pressure Vessel Pro costs $5.99 and PIDTune $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PIDTune holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 33% of Pressure Vessel Pro's written reviews are positive against 100% of PIDTune's.

Pressure Vessel Pro ships an update every 5 months, PIDTune every 4 months. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Pressure Vessel Pro | PIDTune |
| --- | --- | --- |
| Price | $5.99 | **$4.99** |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pidtune/id1045174726/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 10 MB | 1 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [Richard H Street](https://appshunter.io/developer/954888336) |

## 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


### PIDTune

[App page](https://appshunter.io/ios/app/pidtune/id1045174726)

This utility calculates PID tuning parameters using the IMC method for various process and controller types. It allows for direct input of process gain or variable changes, with adjustable tuning aggression via a slider.

**Highlights:** IMC method for PID tuning, Calculates Kc, Ti, Td, Supports FO, SO, and I process types, Handles Parallel and Series controller types, Adjustable tuning aggression slider, Input process gain or variable changes

**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 PIDTune free?

PIDTune costs $4.99, with no in-app purchases.

### Which has better reviews, Pressure Vessel Pro or PIDTune?

PIDTune is rated higher. Pressure Vessel Pro averages 4.5 out of 5 from 2 ratings, while PIDTune averages 5.0 from 2 ratings.

### Do Pressure Vessel Pro or PIDTune have ads?

Neither Pressure Vessel Pro nor PIDTune shows ads.

### Which is updated more often, Pressure Vessel Pro or PIDTune?

Pressure Vessel Pro ships an update every 5 months, and PIDTune every 4 months. Most recently, Pressure Vessel Pro was updated on September 17, 2026 and PIDTune on September 21, 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.*