# Oxygen vs ChemSpark

The clearest difference is in-app purchases: Oxygen at none against ChemSpark's 5. Oxygen also leads on ads (none vs shown) and rating (5.0 vs 4.6). On price, ratings volume and device support there is nothing between them.

Both are free to download. ChemSpark sells 5 one-off in-app purchases. Oxygen asks for nothing beyond the download.

Oxygen holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 6 and 8 respectively.

Oxygen ships an update every 9 days, ChemSpark monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Oxygen | ChemSpark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/oxygen/id6645736637/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/chemspark-chemistry-practice/id6746169230/reviews) |
| Number of ratings | 6 | **8** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 45 MB | 43 MB |
| Requires iOS | **14.0.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Shayar Ghafour](https://appshunter.io/developer/1790857594) | [Lojas Software Corp](https://appshunter.io/developer/1799458054) |

## What reviewers say

### Oxygen

[App page](https://appshunter.io/ios/app/oxygen/id6645736637)

This app provides medical students with a dedicated platform for their studies. It offers access to pre-recorded lectures aligned with coursework, allowing for flexible learning. The app features distinct roles for students and administrators to ensure an organized and efficient educational experience.

**Highlights:** Pre-recorded lecture access, Coursework-aligned content, Student role for learning, Administrator role for management, Flexible study schedule

**In-app purchases:** none


### ChemSpark

[App page](https://appshunter.io/ios/app/chemspark-chemistry-practice/id6746169230)

Master chemistry concepts and prepare for exams with this comprehensive study tool. It offers a dynamic way to test knowledge across various topics, featuring diverse question types, visual learning aids, and detailed feedback to track progress and improve understanding.

**Highlights:** Extensive question bank with varying difficulty, Multiple question types (multiple-choice, fill-in-the-blank), Visual learning aids with images and diagrams, Detailed feedback and answer explanations, Structured learning by subject and topic, Progress tracking and score monitoring, Interactive testing interface

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Test Tube of Hints (25) | $0.99 | one-time |
| Combustion Skips (5) | $0.99 | one-time |
| Atomic Skips (15) | $1.99 | one-time |
| Beaker of Hints (60) | $2.99 | one-time |
| Flask of Hints (150) | $4.99 | one-time |


## Frequently asked questions

### Is Oxygen free?

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

### Is ChemSpark free?

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

### Which has better reviews, Oxygen or ChemSpark?

Oxygen is rated higher. Oxygen averages 5.0 out of 5 from 6 ratings, while ChemSpark averages 4.6 from 8 ratings.

### Do Oxygen or ChemSpark have ads?

ChemSpark shows ads; Oxygen does not.

### Which is updated more often, Oxygen or ChemSpark?

Oxygen ships an update every 9 days, and ChemSpark monthly. Most recently, Oxygen was updated on October 24, 2026 and ChemSpark 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.*