# Fullscreen Clock vs Molecule Simulator

The clearest difference is in-app purchases: Molecule Simulator at none against Fullscreen Clock's 1. Molecule Simulator also leads on ads (none vs shown) and review sentiment (100% vs 76%). Fullscreen Clock's advantage is update cadence (every 8 days vs every 4 months) and rating (4.7 vs 4.3). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Fullscreen Clock sells 1 one-off in-app purchase. Molecule Simulator asks for nothing beyond the download.

Fullscreen Clock holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Fullscreen Clock has 2.2K ratings behind it against 24, so its average is the more settled of the two. Written reviews complicate that: 76% of Fullscreen Clock's written reviews are positive against 100% of Molecule Simulator's, so the app with the better star average is not the one people write more warmly about.

Fullscreen Clock ships an update every 8 days, Molecule Simulator every 4 months. The most recent releases landed on September 29, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Fullscreen Clock | Molecule Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/fullscreen-clock-flip-and-focus/id1403700342/reviews)** | [4.3 (24 ratings)](https://appshunter.io/ios/app/molecule-simulator/id1538249996/reviews) |
| Number of ratings | **2.2K** | 24 |
| Positive reviews | 75.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 8 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Gude Aipu Technology Co., Ltd](https://appshunter.io/developer/1896411340) | [仕清 刘](https://appshunter.io/developer/1531464103) |

## What reviewers say

### Fullscreen Clock

[App page](https://appshunter.io/ios/app/fullscreen-clock-flip-and-focus/id1403700342)

Transform your device into a stylish flip clock that doubles as a productivity tool. Enhance your workspace with aesthetic widgets and utilize the integrated focus timer for improved concentration during study or work sessions.

**Highlights:** Iconic flip clock animation, Deep focus timer (Pomodoro/custom), Stunning home screen widgets, Elegant and minimalist interface, Extensive customization options, Versatile timers and stopwatch, Floating clock for iPadOS

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

**In-app purchases (1)**

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

**What reviewers like**

- 🚀 Efficient
- 👍 Simple and useful
- 👍 Great tool
- 👍 Excellent app
- 👍 Awesome clock

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Buggy widget
- 🔋 Drains battery
- 👎 Hard to exit
- 👎 Annoying ads

**Reported bugs**

- Widget doesn't adjust for DST
- Clock resets when exiting app
- Hangs up on some devices
- Ads cover the clock

**Requested features**

- Add color customization
- Integrate date display
- Add 12-hour time format with AM/PM
- Improve countdown timer functionality
- Add stopwatch widget


### Molecule Simulator

[App page](https://appshunter.io/ios/app/molecule-simulator/id1538249996)

Visualize the 3D structures of molecules using data from PubChem and Protein Data Bank. Explore molecules in various viewing modes and download an extensive library of compounds.

**Highlights:** 3D molecular visualization, Space filling mode, Ball-and-stick mode, Data from PubChem, Data from Protein Data Bank, Downloadable molecule library

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fullscreen Clock free?

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

### Is Molecule Simulator free?

Molecule Simulator is free to download, with no in-app purchases.

### Which has better reviews, Fullscreen Clock or Molecule Simulator?

Fullscreen Clock is rated higher. Fullscreen Clock averages 4.7 out of 5 from 2.2K ratings, while Molecule Simulator averages 4.3 from 24 ratings.

### Do Fullscreen Clock or Molecule Simulator have ads?

Fullscreen Clock shows ads; Molecule Simulator does not.

### Which is updated more often, Fullscreen Clock or Molecule Simulator?

Fullscreen Clock ships an update every 8 days, and Molecule Simulator every 4 months. Most recently, Fullscreen Clock was updated on September 29, 2026 and Molecule Simulator 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.*