DUX vs Keepthat
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DUX
Master user experience design with a comprehensive guide to design principles. Explore interactive examples, case studies, and practical tips to enhance your digital creations. Ideal for designers and enthusiasts looking to create captivating user experiences.
- Comprehensive design principles
- Interactive learning modules
- Practical implementation tips
- User-friendly interface
- Case studies and examples
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Unlock the secrets to crafting remarkable user experiences with DUX, your ultimate guide to design principles. Whether you're a seasoned UX designer, a budding enthusiast, or someone eager to enhance their digital creations, this app is your go-to resource for mastering the art and science of user-centered design. Features: - Comprehensive Collection: Access a curated compilation of fundamental design principles based on psychological insights, user behavior studies, and real-world applications. - Interactive Learning: Dive into each law with interactive examples, case studies, and practical applications to deepen your understanding and improve your design skills. - Practical Guidance: Receive actionable tips and best practices for implementing each law into your design projects, ensuring optimal user engagement and satisfaction. - User-Friendly Interface: Navigate effortlessly through the app's intuitive interface, designed for seamless exploration and easy accessibility to content. Whether you're designing websites, mobile apps, or digital interfaces, DUX equips you with the knowledge and tools to create experiences that captivate and delight users. Download now and revolutionize your approach to user experience design! Terms of Use: https://dux-lab.com/terms-of-use
Keepthat
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Stop forgetting what you read. Paste any article or URL — AI extracts the key facts and quizzes you so you actually remember. You consume hours of content every week — articles, videos, newsletters — but how much do you actually retain? Research shows we forget 70% of new information within 24 hours. Keepthat is built to beat the forgetting curve. HOW IT WORKS 1. Capture — Paste a link or text from any source 2. Extract — AI identifies key facts instantly 3. Quiz — Test yourself with AI-generated questions 4. Remember — Spaced repetition locks facts into long-term memory WORKS WITH ANYTHING YOU READ OR WATCH • Articles and blog posts • YouTube videos • Newsletters and emails • Book passages and highlights • Lecture notes • Any text you paste AI-POWERED FACT EXTRACTION No manual note-taking required. Share a link or paste text, and Keepthat reads the content, identifies the most important facts, and organizes them by topic. Your personal knowledge base builds itself. QUIZZES THAT ADAPT TO YOU True/false, multiple choice, and fill-in-the-blank — AI generates varied questions to test real understanding, not just recognition. The SM-2 spaced repetition algorithm schedules reviews right before you'd forget, so every minute you study counts. TRACK YOUR PROGRESS • Daily streaks to keep you consistent • Accuracy stats across all topics • Memory strength indicator for each fact • Weekly activity heatmap • Knowledge breakdown by topic • Weak spots highlighted for targeted review ORGANIZE YOUR KNOWLEDGE • Create unlimited custom topics • Favorite important facts • Archive mastered material • Search your entire knowledge base SHARE EXTENSION Send content to Keepthat directly from Safari, YouTube, or any app using the iOS share sheet. No copy-pasting needed. FREE TO START • 3 AI extractions per day • 3 quizzes per day • Store up to 100 facts • Full stats and streak tracking KEEPTHAT PRO • 50 extractions per day • 50 AI-generated quizzes per day • Unlimited fact storage • Custom notification schedule Download free and remember your first article in under 60 seconds. Keepthat Pro is available as a monthly or annual auto-renewing subscription. Payment is charged to your Apple ID account at confirmation of purchase. Your subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can manage and cancel subscriptions in your Apple ID account settings. Terms of Use: https://keepthat.app/terms-of-use Privacy Policy: https://keepthat.app/privacy-policy By using this app, you agree to Apple's Standard End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Keepthat at fortnightly against DUX's every 3 months. On price, ads, 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. DUX sells 8 in-app purchases, starting at $1.99 per month and Keepthat sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
DUX ships an update every 3 months, Keepthat fortnightly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.
| Parameter | DUX | Keepthat |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (9 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 48 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | AmirHossein Golmohammadi | Valeriia Tsova |
In-app purchases
DUX
- Pro Account - 1 Month$1.991 Month
- Pro Account - 3 Month$5.993 Months
- Pro Account - Unlimited Hearts$7.991 Year
- 50 Dux Points$0.99
- 250 Dux Points$3.99
- Extra Lesson$3.99
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- 500 Dux Points$7.99
- 1000 Dux Points$14.99
Keepthat
- Keep That Pro Monthly$9.991 Month
- Keep That Pro Annual$99.991 Year









