# PCS Instruments vs Molecular Model Simulator

The clearest difference is review sentiment: PCS Instruments at 100% against Molecular Model Simulator's 0%. PCS Instruments also leads on in-app purchases (none vs 1) and ads (none vs shown). Molecular Model Simulator's advantage is update cadence (every 10 days vs every 55 months) and iOS requirement (11.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Molecular Model Simulator sells 1 one-off in-app purchase. PCS Instruments asks for nothing beyond the download.

PCS Instruments ships an update every 55 months, Molecular Model Simulator every 10 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | PCS Instruments | Molecular Model Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 55 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 84 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [PCS Instruments](https://appshunter.io/developer/1575085372) | [博 彭](https://appshunter.io/developer/1293268076) |

## What reviewers say

### PCS Instruments

[App page](https://appshunter.io/ios/app/pcs-instruments/id1575085370)

This utility app simplifies Hertz contact calculations for various geometries and materials. It allows users to input loads and material properties to instantly determine contact conditions, or calculate required loads for specific contact sizes.

**Highlights:** Hertzian geometry calculations, Load and material property input, Instant contact condition results, Customizable contact types, Load calculation for desired contact size, Pre-loaded specimen data for PCS instruments

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

**In-app purchases:** none


### Molecular Model Simulator

[App page](https://appshunter.io/ios/app/molecular-model-simulator/id6459994670)

Visualize and interact with complex 3D molecular structures. Explore atomic arrangements, chemical bonds, and create custom compounds. Ideal for students, educators, and chemistry enthusiasts.

**Highlights:** Dynamic 3D molecular modeling, Interactive exploration (zoom, rotate, pan), Realistic atomic bonding visualization, Custom compound creation, Intuitive user interface, Educational and engaging content

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UpgradeToPro | $0.99 | one-time |


## Frequently asked questions

### Is PCS Instruments free?

PCS Instruments is free to download, with no in-app purchases.

### Is Molecular Model Simulator free?

Molecular Model Simulator is free to download, with in-app purchases available.

### Do PCS Instruments or Molecular Model Simulator have ads?

Molecular Model Simulator shows ads; PCS Instruments does not.

### Which is updated more often, PCS Instruments or Molecular Model Simulator?

PCS Instruments ships an update every 55 months, and Molecular Model Simulator every 10 days. Most recently, PCS Instruments was updated on November 3, 2026 and Molecular Model Simulator 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.*