Real NASA solar activity data, analyzed daily for potential health connections. Five solar moods — from Calm to Extreme — translate complex space weather into actionable sleep, mood, and energy insights.
Every day, the sun emits streams of charged particles that interact with Earth's magnetic field. Scientists track this through metrics like the Kp-index, solar flux, and X-ray flux — numbers that usually live behind dense government dashboards.
Helios pulls those numbers each morning from NASA and NOAA, maps them to one of five solar moods, and generates a daily health analysis: a headline, a scientific interpretation of current conditions, and practical wellness advice. Same date always gets the same report — grounded in real data, written to be understood.
The Health tab goes further: if you wear an Apple Watch, Helios overlays your HRV, resting heart rate, and sleep data alongside solar metrics so you can visually explore whether patterns align. No statistical claims — just the data, side by side.
Helios is designed to respect your privacy. The app requires no account, collects no personal information, contains no analytics SDKs, and stores all data locally on your device.
Helios collects no personally identifiable information. No account, no email, nothing.
If you grant HealthKit permission, Helios reads HRV, resting heart rate, and sleep data from your Apple Health store. This data is read on-device and is never transmitted to any server, never stored in any cloud service, and never shared with any third party.
Helios fetches publicly available solar data from NASA and NOAA and caches it locally on your device for up to 90 days to power the archive and forecast features. NASA and NOAA may log standard request metadata (IP address, timestamp) per their own privacy policies. Helios does not transmit any user-identifiable information in these requests.
Helios contains no analytics SDKs — no Firebase, no Mixpanel, no third-party crash reporters. There is no cross-app or cross-site tracking.
All data (solar cache, HealthKit reads, and the onboarding completion flag) is stored locally. Deleting the app removes all data permanently.
Helios does not knowingly collect information from children under 13.
Material changes to this policy will be communicated via an in-app notice.
Privacy questions: [email protected]
By downloading or using Helios, you agree to these Terms. If you do not agree, do not use the app.
Helios is not a medical device and does not provide medical advice. The health correlations shown in the Health tab are visual overlays for exploratory purposes only and are not the result of clinical analysis or peer-reviewed study. Do not use Helios to diagnose, treat, cure, or prevent any health condition. Always consult a qualified healthcare provider for medical concerns.
Helios is licensed for personal, non-commercial use. You may not reverse engineer, copy, or redistribute the app or its content without written permission.
Helios displays data sourced from NASA DONKI and NOAA SWPC. While we fetch from authoritative sources, we cannot guarantee that all data is current or error-free. NASA and NOAA data is provided as-is under their respective open-data policies and is in the public domain per US federal law.
To the maximum extent permitted by law, Chenxiao Ma shall not be liable for any indirect, incidental, or consequential damages arising from your use of Helios.
The Helios app name, design, and interpretation text are the intellectual property of Chenxiao Ma.
These Terms are governed by the laws of the State of California, without regard to conflict of law principles.
We may update these Terms from time to time. Continued use of the app after changes take effect constitutes acceptance.
Questions: [email protected]