Adiem vs Big Days
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Adiem
This app uses personalized haptic rhythms based on your heart data to help you self-regulate and feel calm in social situations. It discreetly guides your body into a relaxed state through subtle vibrations on your wrist.
- Personalized haptic feedback
- Apple Watch integration
- Adaptive rhythm adjustment
- Seamless and private operation
- Supports emotional regulation
- Based on heart data
Read full descriptionHide full description
Find your calm. Feel it from your wrist. Adiem delivers gentle haptic rhythms through your Apple Watch — personalized to your heart data — that help your body settle into a calmer, more grounded state. It's like music you don't just hear — you feel. Using real-time analysis of your heart rate and variability, Adiem creates a soothing pulse that mirrors your most resilient state. You'll feel this rhythm on your wrist for one minute, every three minutes — quietly guiding your body toward calm. Key Features: 1. Personalised Calming Rhythms Adiem adapts its haptic rhythm to your unique biometrics — heart rate, variability, and resting baseline. Support that's made for your body. 2. Live Dashboard & Insights Track every session in real time. See your Calming Effect, heart rate trends, and how your body responds — all in a clean, private dashboard at adiem.com. 3. Trends That Grow With You The more you use Adiem, the smarter it gets. Unlock personal insights over time — your best time of day, your calming trend, which session length works best, and even how weather affects your calm. 4. Effortless Apple Watch Integration Launch sessions discreetly, anytime, anywhere. Add Adiem as a Watch complication for instant access with one tap. Sessions run for up to 1 hour. 5. Seamless & Private Adiem operates silently in the background. No sounds, no screens, no distractions — just a calm pulse on your wrist while you live your life. How It Works: 1. Start a Session Tap your Apple Watch. Adiem begins reading your heart and delivering personalized haptic rhythms — quietly, invisibly. 2. Feel Your Body Settle Subtle vibrations sync with your heart's rhythm, gently guiding your body into a more relaxed state. Like slow breathing, but through touch. 3. See Your Progress After each session, your dashboard shows exactly what happened — how your heart rate shifted, how your body responded, and how this session compares to others. Who Is Adiem For? Anyone seeking calm, focus, or ease — privately, in everyday life. Whether you're managing anxiety, navigating social situations, preparing for a challenging moment, or simply want to feel more grounded, Adiem helps you stay centered and present. The Science Behind Adiem: Developed with leading universities in neuroscience and physiology. In our first published study, users showed a 12% increase in cognitive empathy — a key trait for meaningful connection. Ongoing research continues to validate Adiem's impact on emotional well-being and real-world resilience. Start free. Upgrade when you're ready. Learn more at adiem.com
Big Days
A minimalist app to track important future and past dates with a clean interface. Easily manage events, add notes, and receive local reminders. Offers home screen widgets for quick access.
- Count down and count up for events
- Highlight events happening today
- Edit, pin, and add notes to events
- Home screen widgets for progress
- Local reminders with repeat rules
- iCloud sync across devices
Read full descriptionHide full description
Big Days is a minimalist app focused on managing your important dates. Why choose Big Days: Native experience: Built with SwiftUI and iOS-native interactions for smooth and stable performance Minimal design: Clear information hierarchy so your most important dates are visible at a glance Simple workflow: Create events in just a few steps with no learning curve Core features: Count down and count up: Track days remaining for future events and days passed for past events Today highlight: Events happening today are clearly emphasized so you never miss a key moment Event management: Edit, pin, add notes, and delete events easily Memory notes: Add multiple notes to each event to keep long-term memories Home screen widgets: Check key event progress directly from your Home Screen Local reminders: Flexible reminder preferences and repeat rules Languages and themes: Supports Chinese and English, with Auto, Light, and Dark appearance iCloud sync: Keep your data in sync across devices when enabled Great for birthdays, anniversaries, paydays, exams, trips, project milestones, and holiday countdowns. Big Days is built to stay lightweight, clear, and dependable, so every important date gets the attention it deserves.
Screenshots
Verdict
The clearest difference is price: Adiem at Free against Big Days's $0.99. Adiem also leads on rating (5.0 vs 4.5) and ratings volume (10 vs 2). Big Days's advantage is update cadence (weekly vs every 2 months). On review sentiment, 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
Adiem is free to download; Big Days costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Adiem holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Adiem has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 77% and 77% positive.
Adiem ships an update every 2 months, Big Days weekly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | Adiem | Big Days |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (10 ratings) — better | 4.5 (2 ratings) |
| Positive reviews | 76.9% of reviews | 76.9% of reviews |
| Number of ratings | 10 — better | 2 |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 35 MB | 3 MB |
| Age rating | 4+ | 9+ |
| Developer | Adiem | 刚 王 |
Customer experience
Adiem
Big Days
In-app purchases
Adiem
No in-app purchases
Big Days
No in-app purchases







