iOS · Space Weather

Know the sky tonight.

Astraflare fuses NOAA, NASA and USNO data into one answer: is the aurora worth driving out for, which planets are up, is a storm coming?

Download on the App Store
Astraflare Aurora tab — live Kp index with tonight's visibility verdict
Aurora

Odds on tonight's aurora, in plain English.

Live Kp, 3-day forecast, cloud cover, moon interference and your latitude — combined into a single verdict card.

  • Kp index gauge with 3-day forecast and geomagnetic-storm probabilities
  • OVATION aurora-oval map with live cloud-cover overlay
  • Tonight's window card: twilight × Kp × moon × clouds × latitude
  • Photography assistant — camera recipes (ISO, shutter, aperture) tuned to conditions
Aurora dashboard with Kp 2- gauge and tonight's visibility verdict
Solar

The Sun, live.

SDO and SOHO imagery, X-ray flux, flare history and a 3-D CME orrery — all one tap away.

  • Live SDO imagery (AIA 171, AIA 304, HMI) and SOHO LASCO coronagraphs
  • X-ray flux chart, flare probability, recent-flares log
  • Solar wind — speed, density, Bz — on 12 h / 24 h / 7 d ranges
  • CME tracking with a 3-D propagation orrery and R/S/G scales
Solar tab showing SDO AIA 171 imagery and flare summary
Sky

Everything up tonight.

Moon, planets, comets and satellite passes — computed locally, accurate to the minute.

  • Moon phase, illumination and rise / set / transit times
  • Twilight windows: civil, nautical and astronomical darkness
  • Planets & comets tonight with magnitude and altitude
  • Visible satellite passes (ISS, Starlink and more) via on-device SGP4
Sky tab with moon phase and rise/set times for moon and sun
Events

A century of eclipses, ready to plan around.

Every solar and lunar eclipse through 2100, plus meteor showers, conjunctions and planet parades — tailored to where you are.

  • Solar & lunar eclipses through 2100 with local circumstances and path rendering
  • Meteor-shower calendar from IMO data — peak dates, ZHR, radiant altitude
  • Planetary conjunctions and planet parades with separation angles
  • 30-day storm history to spot active solar weeks
Solar eclipse detail showing path of totality on a rotating globe
Alerts

Notifications for exactly what you care about.

Live SWPC bulletins plus configurable thresholds — Kp, flare class, conjunction separation, eclipses at your location.

  • Live SWPC bulletins by type (geomagnetic, flare, radiation, radio blackout)
  • Configurable push — Kp threshold, minimum flare class, conjunction separation
  • Eclipse alerts scoped to events visible from your location
  • Background polling plus server-side push for short-notice events
Alerts tab with a running list of SWPC space-weather bulletins
Share tonight

Turn tonight's best sky event into a card you can share.

One tap generates a 1080 × 1350 portrait card with the headline event — aurora, meteor peak, conjunction, eclipse or bright comet — ready for wherever you post.

Share Tonight card featuring a Lyrids peak announcement

Live data from seven public, unauthenticated sources — no scraping, no middlemen.

NOAA SWPC NASA DONKI NASA Helioviewer USNO CelesTrak Minor Planet Center IMO Open-Meteo

Questions.

The short honest answers.

Is it free?

Yes. No account, no paywall, no in-app purchases. Astraflare is made independently; we may add optional features later but the core — aurora, solar, sky, events, alerts — stays free.

Does it work offline?

Partially. Anything the app has recently fetched (aurora map tiles, solar imagery, planet positions, moon phases, the eclipse catalogue through 2100) stays available offline. Live data naturally needs a connection.

Does it send my location anywhere?

Your location is used on-device to compute local aurora visibility, eclipse circumstances, satellite passes and Bortle light-pollution hints. The only outbound use is fetching a cloud-cover forecast from Open-Meteo, with your latitude and longitude rounded to two decimal places (about 1 km) so the cache doesn't fragment on GPS jitter. Nothing goes to our servers.

Why iPhone only?

It's built natively in SwiftUI for iOS 17+. Native buys us the SGP4 satellite propagator, the eclipse Besselian-element solver, CoreLocation precision and background task scheduling — all without a cross-platform abstraction. An iPad layout is on the list; Android is not on the short-term roadmap.

How accurate are aurora predictions?

As accurate as NOAA's OVATION model and the 3-day Kp forecast — which is to say, pretty good a day out and rougher past that. Astraflare doesn't invent its own forecast; it surfaces the official one and combines it with local clouds, moon and twilight so you can act on it.

Who makes Astraflare?

Eldwyn Labs — a small independent studio. We are not affiliated with NASA, NOAA or USNO; we gratefully use their public data. Questions or feedback: support@eldwynlabs.com.