Dolphin vs OnePrep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dolphin
Build a consistent study habit for SAT and ACT exams with daily practice questions and detailed explanations. Track your progress and focus on areas needing improvement, with optional features to block distracting apps.
- Daily practice questions
- Worked explanations
- Vocabulary review
- Focus Mode for distraction blocking
- Progress and streak tracking
- Widgets for quick access
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Build a steady SAT and ACT study habit with Dolphin. Practice in a swipeable feed, work through explanations, and return to the questions and skills that need more attention. PRACTICE A LITTLE EVERY DAY Answer Math, Reading, English, and Science questions, review vocabulary, and set a daily learning goal. UNDERSTAND YOUR ANSWERS Use worked explanations, video solutions where available, and Pip the Tutor to explore a problem. Save questions and revisit mistakes as you study. MAKE ROOM TO FOCUS With your permission, Focus Mode uses Apple's Screen Time controls to block apps you choose on your selected schedule. Complete your lesson goal to unlock them, or take a break when you need one. KEEP YOUR MOMENTUM Track your streak and progress, and add Dolphin widgets to keep your learning goal close by. Dolphin offers optional in-app subscriptions. Features and content availability may vary. SAT is a trademark of the College Board, and ACT is a trademark of ACT, Inc. Dolphin is not affiliated with or endorsed by either organization.
OnePrep
Prepare for standardized tests 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 improve your scores.
- Thousands of SAT-style practice questions
- Realistic timed mock exams
- AI-powered feedback and grading
- Personalized study guidance
- Progress tracking
- Cross-device compatibility
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All your SAT® prep in one place. OnePrep is the ultimate study companion for SAT® students. Practice with thousands of SAT-style questions, realistic mock exams, and AI-powered feedback designed to match the official SAT® format. Meet Prepy AI, your personal tutor. Get instant help with difficult questions, clear explanations, and personalized study guidance anytime. Key features Thousands of SAT-style practice questions with step-by-step explanations Realistic timed mock exams Instant AI feedback and grading Progress tracking to identify weak areas Study anywhere, anytime—OnePrep works seamlessly across all your devices. Join 250k+ students worldwide already improving their SAT® scores with OnePrep. Start studying today for free. Questions? contact@oneprep.xyz Terms of Use (EULA): https://www.oneprep.xyz/terms-of-service
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Verdict
Dolphin and OnePrep both sit at 4.8 stars, but that hides the real split: 84% of Dolphin's written reviews are positive against 41% of OnePrep's. Dolphin also leads on in-app purchases (none vs 10) and ads (none vs shown). OnePrep's advantage is update cadence (every 5 days vs every 2 weeks). On price, rating, ratings volume and device support 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. OnePrep sells 10 in-app purchases, starting at $28.49 per 7 days. Dolphin asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for Dolphin against 4.7 for OnePrep. Both are backed by a comparable volume of ratings — 1.4K and 750 respectively. Written reviews are what separate them: 84% of Dolphin's written reviews are positive against 41% of OnePrep's.
Dolphin ships an update every 2 weeks, OnePrep every 5 days. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.
| Parameter | Dolphin | OnePrep |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (1.4K ratings) — better | 4.7 (750 ratings) |
| Positive reviews | 84.1% of reviews — better | 40.7% of reviews |
| Number of ratings | 1.4K — better | 750 |
| Update frequency | Every 2 weeks | Every 5 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #210 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 220 MB | 87 MB |
| Age rating | 4+ | 4+ |
| Developer | PaloAI Inc. | MyDojo Inc. |
Customer experience
Dolphin
OnePrep
In-app purchases
Dolphin
No in-app purchases
OnePrep
- OnePrep Pro (1 Week)$28.497 Days
- OnePrep Pro (1 Month)$99.991 Month
- OnePrep Pro (3 Months)$269.003 Months
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- OnePrep Pro (1 Year)$589.001 Year
- OnePrep Plus Exam Pass (0-7 Days)$79.00
- OnePrep Pro Exam Pass (0-7 Days)$89.00
- OnePrep Pro Exam Pass (8-14 Days)$90.00
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- OnePrep Pro Exam Pass (15-28 Days)$95.00
- OnePrep Pro Exam Pass (31-44 Days)$134.99
- OnePrep Pro Exam Pass (45-58 Days)$174.99






