SolSync: Circadian Sunlight
In-app purchases
Everyone
info
10+
Downloads
About this app
SolSync is a light-hygiene app for sunlight. It follows sunrise, solar noon, and sunset, names your solar phase, and pairs morning light with evening wind-down.
Educational only, not a medical device. It does not diagnose, treat, cure, or prevent any disease. Vitamin D figures are educational approximations, not lab results and not a dose.
☀️ Solar phases and the daily sun plan
Phases run from dawn and sunrise through morning, UVB rise, solar noon, afternoon, sunset, dusk, and night. Each phase has a short note and an approximate wavelength mix, not a spectrometer.
The daily sun plan (Premium) is timed to your location and a goal: sleep, energy, mood, vitamin D (educational), or consistency. Fitzpatrick skin type only changes the educational midday length.
• Morning light after sunrise, for circadian rhythm and daytime alertness
• A short midday window near solar noon, when the UV index is usually higher
• Evening light around sunset, as a softer step toward sleep
Energy and mood goals can add a short afternoon reset. Tomorrow's windows show the evening before.
Session logging, alarms, and history are Premium
Session logging is a timer. Categories: morning circadian, midday vitamin D, evening wind-down, or custom. Set cloudiness and skin exposure. The live IU estimate uses UV index, minutes, exposure, cloud cover, and skin type, and it is an educational approximation only.
Light-window alarms mark sunrise, midday (solar noon), and evening, on time or 15 or 30 minutes before or after. They stay on your device and are wellness cues, not treatment alerts.
History stores sessions, today's minutes, the educational IU total, a 7-day chart, and a streak of logged days. Export a CSV.
Free with every download
Without a subscription:
• Current solar phase, a sunrise-to-night timeline, sunrise, solar noon, and sunset
• UV index, cloud cover, and temperature
• Learn: circadian rhythm, vitamin D (educational), evening light hygiene, sun safety, and the estimator
• Moon phase on your device, and an approximate compass when the phone supports it
• Name, skin type, goal, educational daily IU goal, and °F or °C
• Your location, or the Austin, TX demo
• Guest preview on this device, or sign in with email, Google, or Apple
SolSync Premium is optional
• Monthly: $9.99 per month
• Yearly: $59.99 per year
• Both include a 7-day free trial, then the price above
• Renews automatically until you cancel in Google Play
• Google Play handles payment. SolSync does not store your card
• Restore purchases is in the app
• Email updates are optional and are not required to start a trial
Sunlight and safety
Sun exposure can burn and damage skin. SolSync does not recommend burning. Ask a healthcare professional for personal medical advice. Diet, latitude, and health all affect vitamin D, and this app does not measure them.
Sun times and solar phases are calculated on your device. UV index, clouds, and temperature come from a weather service for your coordinates.
Educational only, not a medical device. It does not diagnose, treat, cure, or prevent any disease. Vitamin D figures are educational approximations, not lab results and not a dose.
☀️ Solar phases and the daily sun plan
Phases run from dawn and sunrise through morning, UVB rise, solar noon, afternoon, sunset, dusk, and night. Each phase has a short note and an approximate wavelength mix, not a spectrometer.
The daily sun plan (Premium) is timed to your location and a goal: sleep, energy, mood, vitamin D (educational), or consistency. Fitzpatrick skin type only changes the educational midday length.
• Morning light after sunrise, for circadian rhythm and daytime alertness
• A short midday window near solar noon, when the UV index is usually higher
• Evening light around sunset, as a softer step toward sleep
Energy and mood goals can add a short afternoon reset. Tomorrow's windows show the evening before.
Session logging, alarms, and history are Premium
Session logging is a timer. Categories: morning circadian, midday vitamin D, evening wind-down, or custom. Set cloudiness and skin exposure. The live IU estimate uses UV index, minutes, exposure, cloud cover, and skin type, and it is an educational approximation only.
Light-window alarms mark sunrise, midday (solar noon), and evening, on time or 15 or 30 minutes before or after. They stay on your device and are wellness cues, not treatment alerts.
History stores sessions, today's minutes, the educational IU total, a 7-day chart, and a streak of logged days. Export a CSV.
Free with every download
Without a subscription:
• Current solar phase, a sunrise-to-night timeline, sunrise, solar noon, and sunset
• UV index, cloud cover, and temperature
• Learn: circadian rhythm, vitamin D (educational), evening light hygiene, sun safety, and the estimator
• Moon phase on your device, and an approximate compass when the phone supports it
• Name, skin type, goal, educational daily IU goal, and °F or °C
• Your location, or the Austin, TX demo
• Guest preview on this device, or sign in with email, Google, or Apple
SolSync Premium is optional
• Monthly: $9.99 per month
• Yearly: $59.99 per year
• Both include a 7-day free trial, then the price above
• Renews automatically until you cancel in Google Play
• Google Play handles payment. SolSync does not store your card
• Restore purchases is in the app
• Email updates are optional and are not required to start a trial
Sunlight and safety
Sun exposure can burn and damage skin. SolSync does not recommend burning. Ask a healthcare professional for personal medical advice. Diet, latitude, and health all affect vitamin D, and this app does not measure them.
Sun times and solar phases are calculated on your device. UV index, clouds, and temperature come from a weather service for your coordinates.
Daily sun plan for sunrise, UV, and circadian light hygiene. Educational.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesLocation, Personal info and 2 others
- Data is encrypted in transit
- You can request that data be deleted
What’s new
New: share your daily Sunlight Score card.
App support
About the developer
Gavin Hassett
gthconsultingllc1@gmail.com
2416 E 10th St
#B
Austin, TX 78702
United States