Comparison

ReBrain vs Study Penguin

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

Head to head
About

ReBrain

Features
Read full description

ReBrain is a flashcard learning app powered by a spaced repetition algorithm based on the forgetting curve. Instead of simple repetition, cards are shown at the optimal timing based on how well you remember themβ€”helping you learn efficiently and retain information long-term. Features ・Multiple study modes: Learn with flashcards, typing, multiple-choice quizzes, and red-sheet mode. ・Quick Search: Instantly look up words with a single tap. ・Smart Study: Review based on the forgetting curve. Cards you struggle with appear more frequently, while well-learned cards appear less often. ・Custom themes (Pro): Personalize the app with different colors, fonts, and icons. There are no ads in the app, and all learning-related features are completely free. Additional customization options require a purchase. For more details, please visit our website. Site: https://rebrainapp.studio.site Terms of Use: https://rebrainapp.studio.site/termsofuse Privacy Policy: https:// rebrainapp.studio.site/privacypolicy

About

Study Penguin

Read full description

Study Penguin β€” Your All-in-One Study Companion Everything you need to study smarter, all in one app. Study Penguin combines time tracking, task management, spaced repetition flashcards, Pomodoro timer, and daily to-do lists into a single, beautifully designed experience. Whether you're preparing for exams, learning a new skill, or building daily study habits, Study Penguin keeps you focused, organized, and motivated. KEY FEATURES β€” Study Timer & Pomodoro β€” Track every minute of your study sessions with precision. Choose between a flexible stopwatch, countdown timer, or structured Pomodoro technique with customizable focus and break intervals. Ambient background sounds β€” rain, classroom, brown noise, pencil writing, simmering pot, and underwater β€” help you stay in the zone. β€” Smart To-Do Lists β€” Plan your day with purpose. Set up to 3 daily tasks, 2 challenge goals that push your limits, and 2 "Not To-Do" items to eliminate distractions. Your morning flow guides you through goal-setting each day, keeping your intentions clear and actionable. β€” Flashcards with Spaced Repetition β€” Create rich flashcards with text, images, and audio. Our spaced repetition algorithm schedules reviews at optimal intervals so you remember more with less effort. Track mastery levels and watch your knowledge grow over time. β€” Subject & Task Management β€” Organize your studies by subject and track time spent on each. Review history shows exactly when and how long you studied, making it easy to identify gaps and balance your workload. β€” Daily News & Motivation β€” Start each day with a personalized study newspaper featuring your progress, achievements, and an editorial space for reflection. Look back on past editions to see how far you've come. β€” Detailed Records & Analytics β€” Visualize your study patterns with daily, weekly, and monthly breakdowns. See your streaks, total hours, and subject distribution at a glance. Data-driven insights help you optimize your routine. β€” iCloud Sync β€” Seamlessly sync all your data across devices. Switch between iPhone and iPad without losing a single flashcard, study session, or achievement. β€” Calming Design β€” A clean, distraction-free interface with light and dark modes. Study Penguin is designed to feel like a trusted companion β€” always there when you need it, never in the way. Study Penguin is built for every learner: students preparing for university entrance exams, professionals studying for certifications, language learners building vocabulary, and anyone who believes in the power of consistent daily effort. Download Study Penguin today and transform the way you study.

Screenshots

ReBrain4 screens
Study Penguin4 screens

Verdict

The call

The clearest difference is in-app purchases: Study Penguin at none against ReBrain's 3. Study Penguin also leads on update cadence (daily vs every 10 days) and iOS requirement (15.1 vs 18.2). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. ReBrain sells 3 in-app purchases, starting at $1.99 per month. Study Penguin asks for nothing beyond the download.

UpkeepUpdate frequency

ReBrain ships an update every 10 days, Study Penguin daily. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard3 real differences Β· 3 level
ReBrain versus Study Penguin: the parameters behind the verdict, then further details
ParameterReBrainStudy Penguin
PriceFreeFree
Update frequencyEvery 10 daysDaily β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS18.215.1 β€” better
Further details β€” not scored
Size64 MB38 MB
Age rating4+4+
Developerryota hatazawaRei Minamida

In-app purchases

3 purchases

ReBrain

Subscriptions2
  • ReBrain Pro 月鑍$1.991 Month
  • ReBrain Pro 年鑍$5.991 Year
One-time1
  • ReBrain Pro θ²·γ„εˆ‡γ‚Š$9.99
None

Study Penguin

No in-app purchases

Questions

Is ReBrain free?
ReBrain is free to download, with in-app purchases available.
Is Study Penguin free?
Study Penguin is free to download, with no in-app purchases.
Do ReBrain or Study Penguin have ads?
Neither ReBrain nor Study Penguin shows ads.
Which is updated more often, ReBrain or Study Penguin?
ReBrain ships an update every 10 days, and Study Penguin daily. Most recently, ReBrain was updated on October 30, 2026 and Study Penguin on October 31, 2026.

Other comparisons