# Chemistutor vs OnePrep

The clearest difference is rating: OnePrep at 4.7 against Chemistutor's 4.0. OnePrep also leads on update cadence (every 5 days vs every 12 months) and ratings volume (378 vs 27). Chemistutor's advantage is in-app purchases (none vs 23) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. OnePrep sells 23 in-app purchases, starting at $28.49 per 7 days. Chemistutor asks for nothing beyond the download.

OnePrep holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: OnePrep has 378 ratings behind it against 27, so its average is the more settled of the two. Written reviews complicate that: 76% of Chemistutor's written reviews are positive against 45% of OnePrep's, so the app with the better star average is not the one people write more warmly about.

Chemistutor ships an update every 12 months, OnePrep every 5 days. The most recent releases landed on October 13, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Chemistutor | OnePrep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (27 ratings)](https://appshunter.io/ios/app/chemistutor/id6670772147/reviews) | **[4.7 (378 ratings)](https://appshunter.io/ios/app/oneprep-sat-and-act-prep/id6755932961/reviews)** |
| Number of ratings | 27 | **378** |
| Positive reviews | **76.2% of reviews** | 45.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 25 MB | 88 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jonathan Davis Miller](https://appshunter.io/developer/1767512630) | [MyDojo Inc.](https://appshunter.io/developer/1854476769) |

## What reviewers say

### Chemistutor

[App page](https://appshunter.io/ios/app/chemistutor/id6670772147)

Master AP Chemistry with this comprehensive study tool. It offers readings, diagrams, and example problems aligned with the AP curriculum. Learn anytime, anywhere, without distractions, to achieve success in a challenging course.

**Highlights:** AP Chemistry curriculum coverage, 100+ concise lessons, Readings, diagrams, and example problems, No ads or in-app purchases, Learn anytime, anywhere, iPhone and iPad compatible

**In-app purchases:** none


### OnePrep

[App page](https://appshunter.io/ios/app/oneprep-sat-and-act-prep/id6755932961)

Prepare for the SAT with a comprehensive study tool. Access thousands of practice questions, realistic mock exams, and AI-powered feedback. Get personalized guidance from an AI tutor to identify and improve weak areas for your dream score.

**Highlights:** Thousands of SAT-style practice questions, Realistic timed mock exams, Instant AI feedback and grading, Personalized study guidance, Progress tracking, Cross-device compatibility

**In-app purchases (23)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnePrep Pro (1 Week) | $28.49 | per 7 days |
| OnePrep Plus (1 month) | $89.99 | per month |
| OnePrep Pro (1 Month) | $99.99 | per month |
| OnePrep Pro – Monthly | $99.99 | per month |
| OnePrep Plus (3 months) | $239.00 | per 3 months |
| OnePrep Pro (3 Months) | $269.00 | per 3 months |
| OnePrep Pro – 3 Months | $269.00 | per 3 months |
| OnePrep Plus (6 months) | $354.99 | per 6 months |
| OnePrep Pro (6 Months) | $414.99 | per 6 months |
| OnePrep Pro – 6 Months | $414.99 | per 6 months |
| OnePrep Plus (1 year) | $469.00 | per year |
| OnePrep Pro (1 Year) | $589.00 | per year |
| OnePrep Pro – Yearly | $589.00 | per year |
| OnePrep Plus Exam Pass (8-14 Days) | $80.00 | one-time |
| OnePrep Pro Exam Pass (0-7 Days) | $89.00 | one-time |
| OnePrep Pro Exam Pass (8-14 Days) | $90.00 | one-time |
| OnePrep Pro Exam Pass (15-28 Days) | $95.00 | one-time |
| OnePrep Pro Exam Pass (29-30 Days) | $99.00 | one-time |
| OnePrep Pro Exam Pass (31-44 Days) | $134.99 | one-time |
| OnePrep Pro Exam Pass (45-58 Days) | $174.99 | one-time |
| OnePrep Pro Exam Pass (59-72 Days) | $209.99 | one-time |
| OnePrep Plus Exam Pass (8-10 Mos) | $429.00 | one-time |
| OnePrep Plus Exam Pass (10+ Months) | $464.99 | one-time |


## Frequently asked questions

### Is Chemistutor free?

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

### Is OnePrep free?

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

### Which has better reviews, Chemistutor or OnePrep?

OnePrep is rated higher. Chemistutor averages 4.0 out of 5 from 27 ratings, while OnePrep averages 4.7 from 378 ratings.

### Do Chemistutor or OnePrep have ads?

OnePrep shows ads; Chemistutor does not.

### Which is updated more often, Chemistutor or OnePrep?

Chemistutor ships an update every 12 months, and OnePrep every 5 days. Most recently, Chemistutor was updated on October 13, 2026 and OnePrep on October 17, 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.*