OnePrep vs Korah
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OnePrep
Prepare for the SAT 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 identify and improve weak areas for your dream score.
- Thousands of SAT-style practice questions
- Realistic timed mock exams
- Instant AI 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
Korah
This AI-powered tutor helps students prepare for the SAT with adaptive practice, personalized study plans, and detailed analytics. Get on-demand help with questions and track your progress towards your score goals.
- Adaptive practice sets
- Personalized study plans
- AI tutor for question help
- Performance analytics
- Score goal tracking
- Extensive question bank
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The Most Goated SAT Prep App, made by students, for students. Practice — Adaptive practice: Practice Rush & Adaptive Sets targeting weak topics Study Plan — Daily goals + personalized plan to stay on pace for your target Ask Korah — AI tutor for on-demand testing advice & question help Analytics — Weekly trends, topic accuracy, pacing, and coaching insights Profile — Set score goals, track headline stats, manage your journey Question Bank — 3,500+ fully-worked real SAT problems across every topic/difficulty
Screenshots
Verdict
The clearest difference is rating: OnePrep at 4.7 against Korah's 1.0. OnePrep also leads on ratings volume (714 vs 1) and iOS requirement (15.1 vs 26.0). Korah's advantage is in-app purchases (none vs 24) and ads (none vs shown). On price, update cadence 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 24 in-app purchases, starting at $28.49 per 7 days. Korah asks for nothing beyond the download.
OnePrep holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: OnePrep has 714 ratings behind it against 1, so its average is the more settled of the two.
OnePrep ships an update every 5 days, Korah every 4 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.
| Parameter | OnePrep | Korah |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (714 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 40.7% of reviews | — |
| Number of ratings | 714 — better | 1 |
| Update frequency | Every 5 days | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 26.0 |
| Further details — not scored | ||
| Size | 88 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | MyDojo Inc. | Oscar Euceda |
Customer experience
OnePrep
Korah
In-app purchases
OnePrep
- OnePrep Pro (1 Week)$28.497 Days
- OnePrep Plus (1 month)$89.991 Month
- OnePrep Pro (1 Month)$99.991 Month
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- OnePrep Pro – Monthly3 Days trial$99.991 Month
- OnePrep Plus (3 months)$239.003 Months
- OnePrep Pro (3 Months)$269.003 Months
- OnePrep Pro – 3 Months3 Days trial$269.003 Months
- OnePrep Plus (6 months)$354.996 Months
- OnePrep Pro (6 Months)$414.996 Months
- OnePrep Pro – 6 Months3 Days trial$414.996 Months
- OnePrep Plus (1 year)$469.001 Year
- OnePrep Pro (1 Year)$589.001 Year
- OnePrep Pro – Yearly3 Days trial$589.001 Year
- OnePrep Plus Exam Pass (8-14 Days)$80.00
- OnePrep Plus Exam Pass (15-28 Days)$85.00
- OnePrep Pro Exam Pass (0-7 Days)$89.00
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- OnePrep Pro Exam Pass (8-14 Days)$90.00
- OnePrep Pro Exam Pass (15-28 Days)$95.00
- OnePrep Pro Exam Pass (29-30 Days)$99.00
- OnePrep Pro Exam Pass (31-44 Days)$134.99
- OnePrep Pro Exam Pass (45-58 Days)$174.99
- OnePrep Pro Exam Pass (59-72 Days)$209.99
- OnePrep Plus Exam Pass (8-10 Mos)$429.00
- OnePrep Plus Exam Pass (10+ Months)$464.99
Korah
No in-app purchases
