RLX vs StudyKey
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
RLX
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Digital detox, your way. Less scrolling. More time and breathing room for you. Block distracting apps, set daily limits and schedule quiet hours on your iPhone or iPad. Choose which apps, categories and websites to limit. Every feature in RLX is free, with no subscriptions, paywalls, ads or account required. When you want to unwind, breathing, meditation, journaling and sleep sounds are there for you. YOUR APPS, YOUR BOUNDARIES Choose apps, categories and websites with Apple Screen Time. Block them now, set a daily limit or plan quiet hours. See your agreements together in your day view. Take a brief pause before opening selected apps, or choose a stronger temporary lock. Use the heart to save your favorite breathing, meditation and movement practices. In Your exercises, youโll find them alongside exercises youโve recently completed. Your favorites also help shape suggestions in Today and Rest. More room for your thoughts. Type or dictate your notes. Add your own topics and a photo, then revisit everything in Overview. Your journal can be included in your automatic iCloud copy, without syncing. MY EVENING My evening remembers your exercise, favorite sound and sleep timer. Settle in with breathing, a body scan or one of two new visualizations narrated by your chosen iOS voice. Then let the sound continue with your screen locked. Brief guidance is there if you wake in the night, too. In the morning, record how you slept, alongside your sleep recording and available stages from Apple Health if connected. A MOMENT OF CALM, YOUR WAY Take a minute for yourself. Breathe along, follow a short meditation or write about what's on your mind. Choose from 17 breathing rhythms and 18 short text-guided meditations. Make time for a simple movement exercise or a short walk, too. Find what feels right for you today. AGREEMENTS FOR YOUR FAMILY Child Mode gives your child a calm home with breathing and quiet moments. A parent manages the agreements on the child's device with a local PIN. AT HOME ON IPHONE AND IPAD Use the spacious iPad layout or keep a small moment of calm close on iPhone. Light and dark appearances follow your preference. Widgets, Control Center and Shortcuts bring your choices within reach. Saved on your device. With iCloud backup enabled, your journal can also be stored in your own iCloud.
StudyKey
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Make a little learning part of your screen-time routine. StudyKey combines app boundaries, flashcards and focused time in one calm space. Choose how you want to study, set your own rules and make room for what matters. LEARN TO UNLOCK Choose apps to protect and the decks you want to practise. Complete a learning challenge in StudyKey to earn access according to your rule. Set the number of cards and the minutes earned per card, or choose a total break duration. FLASHCARDS, VOCABULARY AND QUIZZES Try ready-made examples to find your learning style. Build knowledge cards, practise words with example sentences or answer four-choice quizzes. Review with spaced repetition, edit individual cards and remove cards or whole decks whenever you need. CREATE FROM YOUR OWN MATERIAL Describe a topic, paste notes, attach a PDF or choose a photo. AI helps turn your source into a draft you can review before saving. Preview attachments and add optional instructions. Photos can be up to 10 MB and are optimised before upload; PDFs can contain up to 5 pages and be up to 2 MB. AI can make mistakes, so check every answer. FOCUS AND SEE YOUR RHYTHM Start a focus session with an intention. Build a personal focus tapestry over time and explore your week, month or year. Share the selected period as an image. BOUNDARIES THAT FIT YOUR DAY Use learning challenges, focus sessions, daily app limits or scheduled quiet hours. App protection requires Screen Time permission on a supported device. STUDYKEY PREMIUM Choose the existing weekly or yearly subscription. The weekly plan includes 75 AI generation credits per calendar week, resetting Monday at 00:00 UTC. The yearly plan includes 75 credits per calendar month, resetting on the first day at 00:00 UTC. One generation attempt uses one credit and creates up to 10 cards. Failed generation attempts also use a credit; unused credits do not roll over. Saved cards and manually created cards do not use AI credits. Shared service safety limits may temporarily affect generation. Subscriptions renew automatically unless cancelled in Apple Settings. Prices and billing periods are shown before purchase. Privacy policy: https://beratonerdev.com/privacy/kotu Terms of use: https://beratonerdev.com/terms/kotu
Screenshots
Verdict
The clearest difference is in-app purchases: RLX at none against StudyKey's 2. RLX also leads on update cadence (every 4 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. StudyKey sells 2 in-app purchases, starting at $4.99 per 7 days. RLX asks for nothing beyond the download.
RLX ships an update every 4 days, StudyKey every 9 days. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.
| Parameter | RLX | StudyKey |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days โ better | Every 9 days |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 โ better | 18.0 |
| Further details โ not scored | ||
| Size | 165 MB | 16 MB |
| Age rating | 12+ | 4+ |
| Developer | Jan Litjens | BERAT ONER |
In-app purchases
RLX
No in-app purchases
StudyKey
- Weekly Premium$4.997 Days
- Yearly Premium$29.991 Year









