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.
Our backend regularly collects public observations from NASA and NOAA and saves historical solar data, even while the app is closed. Helios downloads current data and available history from our backend, 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.
Our backend keeps standard connection logs to analyze performance, diagnose failures, and protect the system. These logs include network request information, not your health records. Read the privacy policy for details.
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 requires no account and keeps your health data on your device. We operate a backend that collects and saves public NASA and NOAA solar data. The app connects to our backend to download current observations, forecasts, events, and available history. These connections generate operational server logs.
When the app connects to our backend, or you visit this website, our servers record standard request information. This includes the connecting IP address, request date and time, HTTP method and requested URL (including query parameters such as solar-history date ranges), response status and size, user agent (which may identify the app, browser, or operating system), and referring URL when provided. API access logs also record request and upstream response times. Error logs may contain connection and request details needed to diagnose failures.
We use these logs to analyze service performance and reliability, diagnose errors, understand demand on our endpoints, detect abuse, enforce rate limits, and protect our systems. IP addresses are network information and can sometimes identify a person or device; these logs are not anonymous. We do not add advertising identifiers or persistent app installation identifiers.
If you grant HealthKit permission, Helios reads supported health records from your Apple Health store for display and comparison on your device. Health records and personal mood entries are not sent to our backend or included in our request logs. We do not store them in our cloud services or share them with third parties.
Our backend saves public solar observations independently of individual app users. Available hourly solar history and NASA events are retained for up to one year; shorter-lived source data and forecasts have shorter retention periods. The app keeps an offline solar cache for up to 90 days. Some requests may connect directly to NASA or NOAA, including fallback requests when backend NOAA data is unavailable. Those providers may log request metadata under their own policies.
Our backend and website are hosted on DigitalOcean and served through Cloudflare. These providers process network requests and may maintain their own security and network logs under their privacy policies. Access to our server logs is restricted to authorized system administrators. We do not sell these logs or use them for advertising.
Helios contains no third-party analytics SDKs or third-party crash reporters. Our own server logs support service operation, performance analysis, and security. We do not use them to track you across other companies' apps or websites.
Server access and error logs are rotated daily when nonempty, with up to 14 rotated files retained for each log. Because empty logs are not rotated, older files can remain longer during periods without traffic. We may retain information separately when necessary to investigate a security incident or comply with legal obligations. Hosting providers manage their own logs under their policies.
Deleting the app removes its local data, but does not remove records from Apple Health or server logs already created. Server logs expire through rotation. For privacy questions or deletion requests, contact [email protected]. We will assess what records we can identify and delete without collecting unnecessary additional information, subject to security and legal needs.
Helios does not request accounts or personal profiles from children. Operational logging applies to connections to the service regardless of age. Please contact us with concerns about a child's information.
This page explains our current privacy practices and shows the effective date. The October 17, 2026 update explains our historical-data backend and operational server logging. We will provide additional notices where required.
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]