# PIDTune vs Plutocalc+ Water

The clearest difference is rating: PIDTune at 5.0 against Plutocalc+ Water's 4.0. Plutocalc+ Water's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

PIDTune costs $4.99 and Plutocalc+ Water $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 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

PIDTune ships an update every 4 months, Plutocalc+ Water every 3 months. The most recent releases landed on October 8, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | PIDTune | Plutocalc+ Water |
| --- | --- | --- |
| Price | $4.99 | $4.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pidtune/id1045174726/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/plutocalc-plus-water/id1142058236/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 5 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Richard H Street](https://appshunter.io/developer/954888336) | [Daniel Peig](https://appshunter.io/developer/1142058235) |

## What reviewers say

### 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


### Plutocalc+ Water

[App page](https://appshunter.io/ios/app/plutocalc-plus-water/id1142058236)

This comprehensive engineering calculator suite offers over 100 solvers for water treatment, hydraulics, and environmental chemistry. It provides instant results with self-explanatory diagrams and internal databases, functioning completely offline. Available in multiple languages, it's designed for professionals needing precise calculations on the go.

**Highlights:** 103 solvers for water treatment and hydraulics, 2670+ calculations with instant results, Self-explanatory diagrams, Internal chemical and standards databases, 100% offline functionality, Multiple language support, Advertisement-free experience

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

**In-app purchases:** none


## Frequently asked questions

### Is PIDTune free?

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

### Is Plutocalc+ Water free?

Plutocalc+ Water costs $4.99, with no in-app purchases.

### Which has better reviews, PIDTune or Plutocalc+ Water?

PIDTune is rated higher. PIDTune averages 5.0 out of 5 from 2 ratings, while Plutocalc+ Water averages 4.0 from 1 ratings.

### Do PIDTune or Plutocalc+ Water have ads?

Neither PIDTune nor Plutocalc+ Water shows ads.

### Which is updated more often, PIDTune or Plutocalc+ Water?

PIDTune ships an update every 4 months, and Plutocalc+ Water every 3 months. Most recently, PIDTune was updated on October 8, 2026 and Plutocalc+ Water on October 14, 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.*