# Molecular Model Simulator vs TOTP Auth

The clearest difference is in-app purchases: TOTP Auth at none against Molecular Model Simulator's 1. TOTP Auth also leads on ads (none vs shown). Molecular Model Simulator's advantage is update cadence (every 10 days vs every 5 weeks) and iOS requirement (11.0 vs 14.0). 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. TOTP Auth asks for nothing beyond the download.

Molecular Model Simulator ships an update every 10 days, TOTP Auth every 5 weeks. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Molecular Model Simulator | TOTP Auth |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 84 MB | 3 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [博 彭](https://appshunter.io/developer/1293268076) | [Contal Travel Group Pty Ltd](https://appshunter.io/developer/1652410259) |

## What reviewers say

### 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 |


### TOTP Auth

[App page](https://appshunter.io/ios/app/totp-auth/id6557050134)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Molecular Model Simulator free?

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

### Is TOTP Auth free?

TOTP Auth is free to download, with no in-app purchases.

### Do Molecular Model Simulator or TOTP Auth have ads?

Molecular Model Simulator shows ads; TOTP Auth does not.

### Which is updated more often, Molecular Model Simulator or TOTP Auth?

Molecular Model Simulator ships an update every 10 days, and TOTP Auth every 5 weeks. Most recently, Molecular Model Simulator was updated on October 8, 2026 and TOTP Auth on October 15, 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.*