Prism vs SunSync
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Prism
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Prism is an elegant utility that transforms your daily sunlight exposure into a journey of discovery. By syncing seamlessly with your Apple Watch, Prism helps you balance your light intake and well-being effortlessly. Key Features 1 Seamless Apple Watch Integration. Automatically syncs Time in Daylight using Apple Watch ambient light sensors for a hands-free tracking experience. 2 Dynamic iPhone Widgets. Stay connected with beautiful Home Screen and Lock Screen widgets that show your progress at a glance. 3 Spirit Evolution. Your sunlight data nourishes unique Spirits. Unlock various visual forms as they evolve based on your daily activity. 4 Environmental Insights. View real-time local UV Index and sunset data to plan your outdoor day safely. 5 Secure HealthKit Sync. Prism integrates deeply with the Apple Health app to store and visualize your light exposure data securely. Disclaimer. All data is for informational purposes only. Please consult a professional before making health decisions. information about the auto-renewable nature of the Premium Subscription: Subscription period: 1 month. Price: $1.99 per month (or local equivalent). Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period. Terms of Use (EULA): [https://superficial-restaurant-956.notion.site/Privacy-Policy-2f3f52245d5580b1ae9ac299a0408cff?source=copy_link]. Privacy Policy: [https://superficial-restaurant-956.notion.site/Terms-of-Use-EULA-2f3f52245d558073aa26f42eb6149f80?source=copy_link].
SunSync
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Always tired, waking groggy, or struggling to fall asleep? The cause might be simpler than you think โ your morning light routine. SunSync syncs your day to the sun. Track sunlight exposure, estimate your vitamin D intake, and get personalized circadian rhythm guidance โ all based on your real location and habits. Your body clock controls your sleep, energy, mood, and focus. SunSync helps you work with it โ not against it. With SunSync you can: - Track sunlight exposure and daily light habits โ know when you've hit your target - Estimate vitamin D from sun exposure based on your skin type and location - Log supplements and monitor your total daily intake - Follow personalized circadian recommendations for your schedule - Discover your best sunlight windows โ and when to avoid the UV index - Build routines to improve sleep and melatonin production naturally - Set smart reminders for sunrise, sunset, and wind-down time - Add a home screen widget โ see your vitamin D window at a glance, without opening the app - View history and long-term trends to see your progress Built for the biohacking community โ and anyone who just wants to feel better. Whether you're optimizing for performance or simply tired of being tired, SunSync gives you the sunlight data your wellness routine has been missing. Vitamin D tracking, body clock alignment, supplement logging, and a home screen widget showing your vitamin D window โ in one app. Disclaimer: SunSync provides estimates and general wellness guidance. It is not a medical device and does not replace professional medical advice. Terms: https://martarodriguezm.github.io/SunSyncLegal/terms.html Privacy Policy: https://martarodriguezm.github.io/SunSyncLegal/privacy.html
Screenshots
Verdict
The clearest difference is device support: Prism at 3 against SunSync's 1. SunSync's advantage is iOS requirement (17.6 vs 26.0). On price, update cadence, ads and in-app purchases 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. Prism sells 1 in-app purchase, starting at $1.99 per month and SunSync sells 2 in-app purchases, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.
Prism ships an update every 11 days, SunSync every 3 weeks. The most recent releases landed on October 11, 2026 and September 25, 2026 respectively.
| Parameter | Prism | SunSync |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 days โ better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, Apple Watch โ better | iPhone |
| Requires iOS | 26.0 | 17.6 โ better |
| Further details โ not scored | ||
| Size | 3 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | ๅ็ ้ | Marta Rodriguez |
In-app purchases
Prism
- Prism Premium (Monthly)1 Month trial$1.991 Month
SunSync
- Year3 Days trial$1.991 Year
- Lifetime$2.99









