Retain vs ZenStudy.ai
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Retain
This minimalist flashcard app uses AI to help you create and study. Its intelligent spaced repetition algorithm optimizes review intervals for efficient learning and rapid progress. Choose from different card layouts to keep your study sessions engaging.
- AI-generated flashcards
- Customizable card layouts
- Spaced repetition algorithm
- Minimalist design
- Progress tracking
Read full descriptionHide full description
A beautifully minimalist flashcard app designed with simplicity and efficiency in mind. Create your own flashcards, or let AI generate them for you. Choose between two different card layouts that keep your learning fresh and engaging. And with our intelligent spaced repetition algorithm, you'll review your cards at optimal intervals, ensuring maximum retention and rapid progress.
ZenStudy.ai
Read full descriptionHide full description
ZenStudy.ai transforms studying into a gamified experience. Upload your PDFs, notes, or summaries, and its advanced AI generates quizzes tailored to your material, helping you learn faster and retain more. Perfect for exam preparation, ZenStudy makes learning efficient and fun, allowing you to organize your content by subjects or courses. Visit www.zenstudy.ai for more details. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Retain at none against ZenStudy.ai's shown. Retain also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (15.1 vs 17.6). On price, in-app purchases 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. Retain sells 2 in-app purchases, starting at $4.99 per month and ZenStudy.ai sells 1 in-app purchase, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.
Retain ships an update every 3 weeks, ZenStudy.ai every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Retain | ZenStudy.ai |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 88.9% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 54 MB | 48 MB |
| Age rating | 4+ | 12+ |
| Developer | Paul Evans | ZenStudy Technologies - FZCO |
In-app purchases
Retain
- Premium Monthly$4.991 Month
- Premium Yearly$29.991 Year
ZenStudy.ai
- Membership$14.991 Month
