# ChemSpark vs Stacked Studying

The clearest difference is in-app purchases: Stacked Studying at none against ChemSpark's 5. Stacked Studying also leads on ads (none vs shown) and update cadence (every 2 days vs monthly). ChemSpark's advantage is ratings volume (8 vs 2). On price, device support and iOS requirement there is nothing between them.

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

Stacked Studying holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

ChemSpark ships an update monthly, Stacked Studying every 2 days. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ChemSpark | Stacked Studying |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (8 ratings)](https://appshunter.io/ios/app/chemspark-chemistry-practice/id6746169230/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stacked-studying/id6777459781/reviews)** |
| Number of ratings | **8** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 18 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Lojas Software Corp](https://appshunter.io/developer/1799458054) | [Josh Britton](https://appshunter.io/developer/6777459783) |

## 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 |


### Stacked Studying

[App page](https://appshunter.io/ios/app/stacked-studying/id6777459781)

This app employs the Pomodoro technique to foster effective study habits and enhance knowledge retention. It integrates study timers and automatic break timers, allowing for customizable durations to suit individual needs. The app offers a free amino acid quiz and over 1500 practice MCAT questions.

**Highlights:** Pomodoro study timer, Automatic break timers, Customizable timer settings, Amino acid quiz, 1500+ MCAT practice questions

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ChemSpark free?

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

### Is Stacked Studying free?

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

### Which has better reviews, ChemSpark or Stacked Studying?

Stacked Studying is rated higher. ChemSpark averages 4.6 out of 5 from 8 ratings, while Stacked Studying averages 5.0 from 2 ratings.

### Do ChemSpark or Stacked Studying have ads?

ChemSpark shows ads; Stacked Studying does not.

### Which is updated more often, ChemSpark or Stacked Studying?

ChemSpark ships an update monthly, and Stacked Studying every 2 days. Most recently, ChemSpark was updated on October 24, 2026 and Stacked Studying on October 31, 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.*