# Tanker vs PID Controller Simulation

The clearest difference is price: Tanker at Free against PID Controller Simulation's $3.99. Tanker also leads on rating (5.0 vs 3.0) and update cadence (monthly vs every 3 months). PID Controller Simulation's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 27.0). On ratings volume, ads and device support there is nothing between them.

Tanker is free to download; PID Controller Simulation costs $3.99 up front. Tanker sells 2 one-off in-app purchases. PID Controller Simulation asks for nothing beyond the download.

Tanker holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Tanker ships an update monthly, PID Controller Simulation every 3 months. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Tanker | PID Controller Simulation |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/pid-controller-simulation/id6612009107/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 20 MB | 6 MB |
| Requires iOS | 27.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Pearson Smith](https://appshunter.io/developer/1268483172) | [立娜 王](https://appshunter.io/developer/1761096632) |

## What reviewers say

### Tanker

[App page](https://appshunter.io/ios/app/tanker-the-sounding-app/id1442173028)

This app streamlines the process of calculating marine fuel tank volumes. It eliminates the need for physical sounding tables and manual calculations, providing instant volume lookups with trim corrections automatically applied. Users can manage target fill levels, track fuel transfers, and share tables with their fleet.

**Highlights:** Instant volume lookups, Target fill level setting, CSV import and tank duplication, Unit conversion and safe fill percentages, Bunkering mode for real-time tracking, Offline functionality, Cloud sharing via TankerBase

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |
| Tanker Pro Lifetime | $59.99 | one-time |


### PID Controller Simulation

[App page](https://appshunter.io/ios/app/pid-controller-simulation/id6612009107)

Master PID control theory and practice with this comprehensive simulation platform. Learn fundamental concepts, tune parameters, and simulate real-world applications like temperature and motor speed control. Export PID parameters as production-ready code in multiple languages.

**Highlights:** Comprehensive tutorial system, Interactive scenario simulations, Performance analysis tools, Code generator for multiple languages, Real-time curve visualization, Advanced PID algorithm explanations

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

**In-app purchases:** none


## Frequently asked questions

### Is Tanker free?

Tanker is free to download, with in-app purchases available.

### Is PID Controller Simulation free?

PID Controller Simulation costs $3.99, with no in-app purchases.

### Which has better reviews, Tanker or PID Controller Simulation?

Tanker is rated higher. Tanker averages 5.0 out of 5 from 1 ratings, while PID Controller Simulation averages 3.0 from 2 ratings.

### Do Tanker or PID Controller Simulation have ads?

Neither Tanker nor PID Controller Simulation shows ads.

### Which is updated more often, Tanker or PID Controller Simulation?

Tanker ships an update monthly, and PID Controller Simulation every 3 months. Most recently, Tanker was updated on November 2, 2026 and PID Controller Simulation 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.*