Amino Acid Quiz vs StudiesTimer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Amino Acid Quiz
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.
- Customizable quizzes
- 20 standard amino acids
- Amino acid names
- Structural formulas
- 1-Letter and 3-Letter codes
- Codons
- Side chain classes
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Test and improve your knowledge of the 20 standard amino acids using this app's customizable quizzes. Multiple choice quizzes cover the following 6 topics: - Amino acid names - Structural formulas - 1-Letter codes - 3-Letter codes - Codons - Side chain classes All topics can be studied for free using this app. An in-app purchase is available to remove the banner ad. The game language can easily be changed in-app to English, French, Spanish, German, Simplified Chinese, Traditional Chinese, Japanese, Korean, Italian, Indonesian, Russian, Portuguese, Swedish, Norwegian, and Dutch.
StudiesTimer
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.
- 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
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Study like it counts. StudiesTimer turns study time into something you can see, share, and compete on. Start a timer, tick off what you finished, and watch your hours stack up next to your friends'. THREE TIMERS, ONE APP • Pomodoro — work and break blocks, any length you want. Not locked to 25 minutes. • Countdown — set a target and go. It keeps counting past zero, because you usually do too. • Stopwatch — open-ended sessions for when you don't know how long you'll last. STUDY WITH PEOPLE, NOT ALONE • Add friends and see who actually put the hours in this week • Start a study group with its own chat and shared schedule • Climb a global leaderboard that moves while you study • Go head to head with a friend in a live session A TASK LIST THAT LIVES WHERE YOU STUDY Write down what you're doing before you start. Tick it off when it's done. No app-switching, no separate to-do list to keep in sync. SEE WHERE THE TIME WENT • Hours by subject, by day, by week • Streaks that break only when you actually miss • Levels, ranks and achievements earned from real hours • Share cards worth posting after a good week ON YOUR LOCK SCREEN Home Screen widgets show today's total at a glance. A Live Activity keeps the running timer on your Lock Screen and in the Dynamic Island, so you never have to open the app just to check the time. WHAT'S FREE The timer, your tasks, streaks, friends and the leaderboard. No trial, no countdown, no card. WHAT PREMIUM ADDS • Your whole history, not just the last stretch • The full analysis of where your hours go • Unlimited subject labels and goals • Start your own groups and study buddies • Every export, and no ads SUBSCRIPTION • Weekly — $4.99 per week • Yearly — 7 days free, then $47.99 per year Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours of the end of that period. Manage your subscription and turn off auto-renewal in your Apple Account settings after purchase. Any unused portion of a free trial is forfeited when you buy a subscription. Terms of Use: https://studiestimer.com/terms Privacy Policy: https://studiestimer.com/privacy
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Amino Acid Quiz | StudiesTimer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (998 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 90.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 998 — better | 2 |
| Update frequency | Every 13 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 100 MB | 70 MB |
| Age rating | 4+ | 12+ |
| Developer | Atlas Educational Software | Hussein Ali El Gazouini |
Customer experience
Amino Acid Quiz
StudiesTimer
Bugs and requests
Amino Acid Quiz
Reported bugs
1 issue- Arginine (Arg) incorrectly displayed as tyrosine (Tyr) in quiz results
Requested features
4 requests- Add drawing/structure input mode
- Include 21st amino acid (selenocysteine)
- Add pH-dependent structure visualization
- Implement a continuous/infinite quiz mode
StudiesTimer
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Amino Acid Quiz
- Remove Ads$0.99
StudiesTimer
- Premium Weekly7 Days trial$4.997 Days
- Premium Weekly$4.997 Days
- Premium Yearly1 Year trial$47.991 Year
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- Premium Yearly7 Days trial$47.991 Year
- Premium Lifetime$79.99









