# Dolphin vs OnePrep

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.

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.

## The numbers

| Metric | Dolphin | OnePrep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.4K ratings)](https://appshunter.io/ios/app/dolphin-sat-prep/id6748280981/reviews)** | [4.7 (750 ratings)](https://appshunter.io/ios/app/oneprep-sat-act-and-ap-prep/id6755932961/reviews) |
| Number of ratings | **1.4K** | 750 |
| Positive reviews | **84.1% of reviews** | 40.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#210** | — |
| Size | 220 MB | 87 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [PaloAI Inc.](https://appshunter.io/developer/1824977301) | [MyDojo Inc.](https://appshunter.io/developer/1854476769) |

## What reviewers say

### Dolphin

[App page](https://appshunter.io/ios/app/dolphin-sat-prep/id6748280981)

**Currently charting:** #210 Top Free · Education (US App Store)

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

**In-app purchases:** none


### OnePrep

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

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnePrep Pro (1 Week) | $28.49 | per 7 days |
| OnePrep Pro (1 Month) | $99.99 | per month |
| OnePrep Pro (3 Months) | $269.00 | per 3 months |
| OnePrep Pro (1 Year) | $589.00 | per year |
| OnePrep Plus Exam Pass (0-7 Days) | $79.00 | 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 (31-44 Days) | $134.99 | one-time |
| OnePrep Pro Exam Pass (45-58 Days) | $174.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*