# ‎Chemical Dictionary vs iORA

The clearest difference is rating: iORA at 5.0 against ‎Chemical Dictionary's 4.4. iORA also leads on review sentiment (100% vs 67%). ‎Chemical Dictionary's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (10.0 vs 14.3). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iORA holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 7 and 12 respectively. Written reviews point the same way: 67% of ‎Chemical Dictionary's written reviews are positive against 100% of iORA's.

‎Chemical Dictionary ships an update every 3 weeks, iORA every 2 months. Both last shipped on October 9, 2026.

## The numbers

| Metric | ‎Chemical Dictionary | iORA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/chemical-dictionary/id1534256700/reviews) | **[5.0 (12 ratings)](https://appshunter.io/ios/app/iora-reaction-visualizer/id1609524913/reviews)** |
| Number of ratings | 7 | **12** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 74 MB | 40 MB |
| Requires iOS | **10.0** | 14.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ban Nguyen Ngoc](https://appshunter.io/developer/1230371083) | [Daniel Ess](https://appshunter.io/developer/1609524915) |

## What reviewers say

### ‎Chemical Dictionary

[App page](https://appshunter.io/ios/app/chemical-dictionary/id1534256700)

Access a comprehensive database of chemical equations, substances, and concepts. This offline-capable application provides detailed explanations and includes a periodic table and solubility chart for enhanced learning.

**Highlights:** Search over 10,000 equations, Search over 3,000 chemical substances, Detailed concept explanations, Offline functionality, Chemical periodic table, Solubility chart

**Features:** macOS Compatibility

**In-app purchases:** none


### iORA

[App page](https://appshunter.io/ios/app/iora-reaction-visualizer/id1609524913)

Visualize chemical reactions in 3D using quantum-mechanical simulations. This free, interactive application makes complex chemistry concepts accessible and engaging for learners.

**Highlights:** 3D chemical reaction visualization, Quantum-mechanical simulations, Interactive learning, Easy to use interface, Educational tool

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ‎Chemical Dictionary free?

‎Chemical Dictionary is free to download, with no in-app purchases.

### Is iORA free?

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

### Which has better reviews, ‎Chemical Dictionary or iORA?

iORA is rated higher. ‎Chemical Dictionary averages 4.4 out of 5 from 7 ratings, while iORA averages 5.0 from 12 ratings.

### Do ‎Chemical Dictionary or iORA have ads?

Neither ‎Chemical Dictionary nor iORA shows ads.

### Which is updated more often, ‎Chemical Dictionary or iORA?

‎Chemical Dictionary ships an update every 3 weeks, and iORA every 2 months. Most recently, ‎Chemical Dictionary was updated on October 9, 2026 and iORA on October 9, 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.*