Comparison

Dolphin vs OnePrep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Daily practice questions
  • Worked explanations
  • Vocabulary review
  • Focus Mode for distraction blocking
  • Progress and streak tracking
  • Widgets for quick access
Currently charting
Read full description

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.

About

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.

Highlights
  • Thousands of SAT-style practice questions
  • Realistic timed mock exams
  • AI-powered feedback and grading
  • Personalized study guidance
  • Progress tracking
  • Cross-device compatibility
Read full description

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

Screenshots

Dolphin4 screens
OnePrep4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 5 level
Dolphin versus OnePrep: the parameters behind the verdict, then further details
ParameterDolphinOnePrep
PriceFreeFree
Rating4.8 (1.4K ratings) — better4.7 (750 ratings)
Positive reviews84.1% of reviews — better40.7% of reviews
Number of ratings1.4K — better750
Update frequencyEvery 2 weeksEvery 5 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#210 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.1 — better
Further details — not scored
Size220 MB87 MB
Age rating4+4+
DeveloperPaloAI Inc.MyDojo Inc.

Customer experience

Dolphin

All ratings1,367 ratings
Positive96.0%
Neutral1.5%
Negative2.5%
Written reviews107 reviews
Positive84.1%
Neutral2.8%
Negative13.1%

OnePrep

All ratings713 ratings
Positive94.0%
Neutral2.1%
Negative3.9%
Written reviews27 reviews
Positive40.7%
Neutral7.4%
Negative51.9%

In-app purchases

None

Dolphin

No in-app purchases

10 purchases

OnePrep

Subscriptions4
  • OnePrep Pro (1 Week)$28.497 Days
  • OnePrep Pro (1 Month)$99.991 Month
  • OnePrep Pro (3 Months)$269.003 Months
Show 1 more
  • OnePrep Pro (1 Year)$589.001 Year
One-time6
  • 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
Show 3 more
  • 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

Questions

Is Dolphin free?
Dolphin 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, Dolphin or OnePrep?
Dolphin is rated higher. Dolphin averages 4.8 out of 5 from 1.4K ratings, while OnePrep averages 4.7 from 750 ratings.
Do Dolphin or OnePrep have ads?
OnePrep shows ads; Dolphin does not.
Which is updated more often, Dolphin or OnePrep?
Dolphin ships an update every 2 weeks, and OnePrep every 5 days. Most recently, Dolphin was updated on November 8, 2026 and OnePrep on November 9, 2026.

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