Comparison

OnePrep vs SATellar

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

Head to head
About

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.

Highlights
  • Thousands of SAT-style practice questions
  • Realistic timed mock exams
  • Instant AI 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

About

SATellar

Prepare for the Digital SAT with adaptive daily practice and simulated tests. Get a predicted score in minutes and focus on your weakest areas. Start for free with daily challenges and optional Pro upgrades for unlimited practice.

Highlights
  • Predicted SAT score in 5 minutes
  • Adaptive difficulty questions
  • Full-length SAT simulations
  • Thousands of real-style questions
  • Fix mistakes with explanations
  • Daily SAT challenge
  • Smart practice for weak topics
Features
Read full description

Stop cramming for the Digital SAT. SATellar gives you a predicted SAT score in 5 minutes, then adaptive daily practice that climbs you to 1400+ — built like Duolingo, not a textbook PDF. Free to start. No account needed. WHO IT’S FOR WHY STUDENTS PICK SATELLAR • Predicted SAT Score in 5 Minutes — Take a quick diagnostic, see your real score out of 1600, and watch it climb every session. • Adaptive Difficulty — Questions get harder when you streak and easier when you struggle. Mirrors the real Digital SAT Module 2 adaptivity. • Full-Length SAT Simulations — Timed two-module practice tests with the same adaptive logic Bluebook uses on test day. • Thousands of Real-Style Questions — Math, including algebra, geometry, advanced math, and data analysis, plus Reading & Writing, including grammar, vocab, and comprehension. • Fix Your Mistakes — Every wrong answer gets a clear “why” explanation, and Fix Mistakes mode re-tests you on past misses until they stick. • Daily SAT Challenge — 10 fresh SAT questions every day, free for everyone. Keep your streak alive and share your result grid. Your daily ritual to a higher score. • Smart Practice — The app surfaces the topics you’re weakest at, so you don’t waste time on what you’ve mastered. • Streaks, Badges, Levels & Leaderboards — Habit-forming progress that makes daily practice actually stick. FREE TO START 10 free practice sessions every month, automatically refilled. No credit card. No subscription. Just download and practice. Refer a friend → earn 5 more free sessions instantly. NO ACCOUNT NEEDED Start practicing in 10 seconds. No email, no password, no tracking. Your practice history, streaks, and bookmarks stay on your device. Apple ID Sync keeps Pro working across all your iOS devices. OPTIONAL PRO Want unlimited daily practice, full-length SAT Simulations, Smart Practice, which auto-targets your weakest topics, and full analytics? Upgrade to Pro — monthly or yearly. Cancel anytime in iPhone Settings. BUILT FOR THE DIGITAL SAT Designed from the ground up for the Digital SAT — modular, adaptive, calculator-integrated. Not an old paper-SAT app retrofitted to a phone. Start with a 5-minute diagnostic. See your predicted score. Free to start. Never go back to cramming.

Screenshots

OnePrep4 screens
SATellar4 screens

Verdict

The call

The clearest difference is rating: OnePrep at 4.7 against SATellar's 3.7. OnePrep also leads on ratings volume (722 vs 3) and update cadence (every 5 days vs fortnightly). SATellar's advantage is ads (none vs shown). On price, in-app purchases, monetization model 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 24 in-app purchases, starting at $28.49 per 7 days and SATellar sells 9 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

OnePrep holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: OnePrep has 722 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

OnePrep ships an update every 5 days, SATellar fortnightly. The most recent releases landed on October 30, 2026 and October 23, 2026 respectively.

Scorecard4 real differences · 6 level
OnePrep versus SATellar: the parameters behind the verdict, then further details
ParameterOnePrepSATellar
PriceFreeFree
Rating4.7 (722 ratings) — better3.7 (3 ratings)
Positive reviews40.7% of reviews—
Number of ratings722 — better3
Update frequencyEvery 5 days — betterFortnightly
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size88 MB63 MB
Age rating4+4+
DeveloperMyDojo Inc.rajasekhar karawalla

In-app purchases

24 purchases

OnePrep

Subscriptions13
  • OnePrep Pro (1 Week)$28.497 Days
  • OnePrep Plus (1 month)$89.991 Month
  • OnePrep Pro (1 Month)$99.991 Month
Show 10 more
  • 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
One-time11
  • 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
Show 8 more
  • 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
9 purchases

SATellar

Subscriptions6
  • SATellar — Digital SAT Prep$4.991 Month
  • SATellar Plus+ — 1500+ SAT$7.991 Month
  • SATellar Pro — 1400+ SAT Prep$12.991 Month
Show 3 more
  • SATellar — Digital SAT Yearly$35.991 Year
  • SATellar Plus+ Yearly 1500+3 Days trial$59.991 Year
  • SATellar Pro — Yearly 1400+3 Days trial$95.991 Year
One-time3
  • SAT Practice — 2 Sessions$1.99
  • SAT Practice — 10 Sessions$7.99
  • SAT Practice — 20 Sessions$12.99

Questions

Is OnePrep free?
OnePrep is free to download, with in-app purchases available.
Is SATellar free?
SATellar is free to download, with in-app purchases available.
Which has better reviews, OnePrep or SATellar?
OnePrep is rated higher. OnePrep averages 4.7 out of 5 from 722 ratings, while SATellar averages 3.7 from 3 ratings.
Do OnePrep or SATellar have ads?
OnePrep shows ads; SATellar does not.
Which is updated more often, OnePrep or SATellar?
OnePrep ships an update every 5 days, and SATellar fortnightly. Most recently, OnePrep was updated on October 30, 2026 and SATellar on October 23, 2026.

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