# Amino Acid Quiz vs StudiesTimer

The clearest difference is ads: StudiesTimer at none against Amino Acid Quiz's shown. StudiesTimer also leads on update cadence (every 10 days vs every 13 months) and review sentiment (100% vs 90%). Amino Acid Quiz's advantage is ratings volume (998 vs 2) and iOS requirement (13.0 vs 17.0). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Amino Acid Quiz sells 1 one-off in-app purchase and StudiesTimer sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for Amino Acid Quiz against 5.0 for StudiesTimer. That said, the two scores are not equally well evidenced: Amino Acid Quiz has 998 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 90% of Amino Acid Quiz's written reviews are positive against 100% of StudiesTimer's.

Amino Acid Quiz ships an update every 13 months, StudiesTimer every 10 days. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Amino Acid Quiz | StudiesTimer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (998 ratings)](https://appshunter.io/ios/app/amino-acid-quiz/id1301129866/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/studiestimer-study-timer/id6800871173/reviews)** |
| Number of ratings | **998** | 2 |
| Positive reviews | 90.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 13 months | **Every 10 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 100 MB | 70 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Atlas Educational Software](https://appshunter.io/developer/1625613074) | [Hussein Ali El Gazouini](https://appshunter.io/developer/6785706683) |

## What reviewers say

### Amino Acid Quiz

[App page](https://appshunter.io/ios/app/amino-acid-quiz/id1301129866)

Test and enhance your understanding of the 20 standard amino acids with customizable quizzes. Explore topics like names, structures, codes, codons, and side chain classes. Study all topics for free, with an optional in-app purchase to remove ads.

**Highlights:** Customizable quizzes, 20 standard amino acids, Amino acid names, Structural formulas, 1-Letter and 3-Letter codes, Codons, Side chain classes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 🚀 Efficient for learning amino acids
- 👍 Clean and user-friendly interface
- 🚀 Helps memorize amino acids quickly
- 👍 Great for MCAT/biochemistry prep
- 👍 Customizable quiz options

**What reviewers complain about**

- 🐛 Incorrect classification of cysteine as non-polar
- 🔍 Missing information on amino acid properties (e.g., pKa, hydrophobicity)

**Reported bugs**

- Arginine (Arg) incorrectly displayed as tyrosine (Tyr) in quiz results

**Requested features**

- Add drawing/structure input mode
- Include 21st amino acid (selenocysteine)
- Add pH-dependent structure visualization
- Implement a continuous/infinite quiz mode


### StudiesTimer

[App page](https://appshunter.io/ios/app/studiestimer-study-timer/id6800871173)

Track your study sessions with multiple timer modes and see your progress visually. Connect with friends to study together, compete on leaderboards, and manage tasks directly within the app. Gain insights into your study habits and share your achievements.

**Highlights:** Multiple timer modes (Pomodoro, Countdown, Stopwatch), Task list integrated with timers, Social features: friends, leaderboards, study groups, Progress tracking and analytics, Lock screen widgets and Live Activities, Streaks, levels, and achievements

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $4.99 | per 7 days |
| Premium Weekly | $4.99 | per 7 days |
| Premium Yearly | $47.99 | per year |
| Premium Yearly | $47.99 | per year |
| Premium Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Amino Acid Quiz free?

Amino Acid Quiz is free to download, with in-app purchases available.

### Is StudiesTimer free?

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

### Which has better reviews, Amino Acid Quiz or StudiesTimer?

StudiesTimer is rated higher. Amino Acid Quiz averages 4.9 out of 5 from 998 ratings, while StudiesTimer averages 5.0 from 2 ratings.

### Do Amino Acid Quiz or StudiesTimer have ads?

Amino Acid Quiz shows ads; StudiesTimer does not.

### Which is updated more often, Amino Acid Quiz or StudiesTimer?

Amino Acid Quiz ships an update every 13 months, and StudiesTimer every 10 days. Most recently, Amino Acid Quiz was updated on October 26, 2026 and StudiesTimer on October 25, 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.*