# ChemSpark vs CASPer Test Prep

The clearest difference is ads: CASPer Test Prep at none against ChemSpark's shown. CASPer Test Prep also leads on update cadence (every 11 days vs monthly) and iOS requirement (15.1 vs 17.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. ChemSpark sells 5 one-off in-app purchases and CASPer Test Prep sells 3 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ChemSpark ships an update monthly, CASPer Test Prep every 11 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | ChemSpark | CASPer Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/chemspark-chemistry-practice/id6746169230/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 50 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lojas Software Corp](https://appshunter.io/developer/1799458054) | [ARISTOKRATI INC.](https://appshunter.io/developer/1893695087) |

## What reviewers say

### 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 |


### CASPer Test Prep

[App page](https://appshunter.io/ios/app/casper-test-prep/id6777382678)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $9.99 | per 7 days |
| Monthly Pro | $20.99 | per month |
| Annual Pro | $139.99 | per year |


## Frequently asked questions

### Is ChemSpark free?

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

### Is CASPer Test Prep free?

CASPer Test Prep is free to download, with in-app purchases available.

### Do ChemSpark or CASPer Test Prep have ads?

ChemSpark shows ads; CASPer Test Prep does not.

### Which is updated more often, ChemSpark or CASPer Test Prep?

ChemSpark ships an update monthly, and CASPer Test Prep every 11 days. Most recently, ChemSpark was updated on October 24, 2026 and CASPer Test Prep on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*