# Molecules by Theodore Gray vs Periodic Table PRO

The clearest difference is price: Periodic Table PRO at Free against Molecules by Theodore Gray's $9.99. Periodic Table PRO also leads on update cadence (every 6 weeks vs every 6 months) and ratings volume (87 vs 29). Molecules by Theodore Gray's advantage is in-app purchases (none vs 8) and review sentiment (75% vs 50%). On rating, ads, monetization model and device support there is nothing between them.

Periodic Table PRO is free to download; Molecules by Theodore Gray costs $9.99 up front. Periodic Table PRO sells 8 one-off in-app purchases. Molecules by Theodore Gray asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Molecules by Theodore Gray against 4.6 for Periodic Table PRO. Both are backed by a comparable volume of ratings — 29 and 87 respectively. Written reviews are what separate them: 75% of Molecules by Theodore Gray's written reviews are positive against 50% of Periodic Table PRO's.

Molecules by Theodore Gray ships an update every 6 months, Periodic Table PRO every 6 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Molecules by Theodore Gray | Periodic Table PRO |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [4.6 (29 ratings)](https://appshunter.io/ios/app/molecules-by-theodore-gray/id923383841/reviews) | **[4.6 (87 ratings)](https://appshunter.io/ios/app/periodic-table-pro/id1601545941/reviews)** |
| Number of ratings | 29 | **87** |
| Positive reviews | **74.7% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Size | 745 MB | 210 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [NatureGuides Ltd.](https://appshunter.io/developer/310574314) | [AGILE FLEX TECH SRL](https://appshunter.io/developer/1601049602) |

## What reviewers say

### Molecules by Theodore Gray

[App page](https://appshunter.io/ios/app/molecules-by-theodore-gray/id923383841)

Explore the molecular world with interactive simulations and detailed information. Discover how elements form compounds and witness the dynamic dance of quantum mechanics through touch. This app offers a fun and educational way to understand the nature of substances.

**Highlights:** Touch-interactive molecular dynamics simulation, Bend, squeeze, and shape molecules, Adjust temperature to observe reactions, Full text of the 'Molecules' book, Interactive object rotations, Dozens of 'still life videos'

**Features:** Vision Pro support

**In-app purchases:** none


### Periodic Table PRO

[App page](https://appshunter.io/ios/app/periodic-table-pro/id1601545941)

Explore a virtual chemistry lab with interactive experiments and detailed information on all chemical elements. Features include atom structure simulations, downloadable PDFs, and studying analytics to enhance learning. Supports multiple languages and offers a cohesive, functional design.

**Highlights:** Virtual chemistry lab with experiments, Detailed chemical element information, Atom structure simulations, Downloadable element PDFs, Studying analytics, Multi-language support

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SPECIAL OFFER! | $9.99 | one-time |
| Chernobyl experiments | $9.99 | one-time |
| Explosive experiments | $9.99 | one-time |
| Funny experiments | $9.99 | one-time |
| Experiments with fire | $9.99 | one-time |
| Gas bubbles experiments | $9.99 | one-time |
| Melting experiments | $9.99 | one-time |
| Oxidation experiments | $9.99 | one-time |


## Frequently asked questions

### Is Molecules by Theodore Gray free?

Molecules by Theodore Gray costs $9.99, with no in-app purchases.

### Is Periodic Table PRO free?

Periodic Table PRO is free to download, with in-app purchases available.

### Which has better reviews, Molecules by Theodore Gray or Periodic Table PRO?

Periodic Table PRO is rated higher. Molecules by Theodore Gray averages 4.6 out of 5 from 29 ratings, while Periodic Table PRO averages 4.6 from 87 ratings.

### Do Molecules by Theodore Gray or Periodic Table PRO have ads?

Neither Molecules by Theodore Gray nor Periodic Table PRO shows ads.

### Which is updated more often, Molecules by Theodore Gray or Periodic Table PRO?

Molecules by Theodore Gray ships an update every 6 months, and Periodic Table PRO every 6 weeks. Most recently, Molecules by Theodore Gray was updated on October 23, 2026 and Periodic Table PRO on October 24, 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.*