Helio is a weather app for the sun. One glance tells you what our star is doing right now, whether it matters for your sky, and what is coming next.
The home screen opens on the actual sun: live imagery from NASA's Solar Dynamics Observatory, with the story underneath. A condition word, one honest sentence, and the numbers that back it up: Kp, solar wind, Bz. Swipe left and the sun becomes the Earth, then the moon. Every world gets the same treatment: a live portrait up top, honest readings below.
THREE WORLDS
• The sun: live solar imagery, current conditions, flares, sunspots, and the solar wind
• The Earth: your planet live from geostationary orbit, the magnetic shield, the ISS, recent earthquakes, and the CO2 record
• The moon: tonight's phase drawn from real ephemeris math, distance and libration, and every eclipse through 2030
• A system map ties it together: ISS, the geostationary ring, the moon, the L1 monitors, and the sun, each at its true position right now
RIGHT NOW
• Live solar imagery as the backdrop, refreshed on NASA's cadence
• Current conditions composed from NOAA data: geomagnetic activity, solar wind, flares, radiation
• Alert cards when NOAA issues watches and warnings, rewritten in plain English
YOUR SKY
• Aurora outlook for where you are: local darkness, moonlight, and the OVATION aurora map with a viewline and your dot
• Your moonrise and moonset, moonlight washout, and the spring or neap tide from the real sun and moon geometry
• CME arrivals from NASA's DONKI model, so you know when a storm is due
• No location? No problem. Deny the prompt and Helio is a complete planetary observatory
LEARN AS YOU GO
• Every number teaches itself: tap any card for a plain-English detail screen with diagrams
• The Kp ladder, Bz explained, flare classes, the NOAA R/S/G scales, and a glossary
• Sun and Earth geometry made visual: day and night globe, orbit view, aurora season
• A 27-day outlook and the shape of the whole solar cycle
BUILT LIKE A WEATHER APP
• Charts you can scrub, a pixel sun and a pixel moon with tappable features, haptics on real events
• Honest offline behavior: last-good data with a clear timestamp, never a fake reading
• Designed for iPhone and iPad, with full VoiceOver and Dynamic Type support
PRIVATE BY DESIGN
Helio has no servers and collects no data. It reads public government feeds directly. Your location is used on your device only and never leaves it. No accounts, no analytics, no ads, no third-party SDKs.
Data: NOAA Space Weather Prediction Center, NASA (SDO, DONKI, SVS), NOAA and partner geostationary weather satellites, USGS, and the U.S. Naval Observatory.
Free. Built for iPhone and iPad.
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