HAMSignal

The solar weather app for HAM radio operators. Real-time band conditions, push alerts, and propagation tools in one place.

The problem we solve: You know conditions are good. You're waiting for the bands to open. But most apps only tell you when there's a storm - not when the conditions improve.

HAMSignal watches K-index and SFI, and tells you when a band opens from your QTH.

Real-Time Solar Data K-index, SFI, A-index updated every 15 minutes from NOAA. All 8 HF bands rated open/fair/closed.

Band Opening Alerts Push notifications when conditions improve. Not storm warnings - band opening notifications. Set thresholds per band. 4-hour cooldown. Based on your grid square.

27-Day Solar Forecast NOAA's published 27-day outlook. See predicted SFI and K-index ranges for the next month. Plan ahead.

Grey Zone / Terminator Overlay The day-night boundary on the solar disk, plus your local sunrise and sunset times. Critical for HF timing.

PSK Reporter Live Data See which bands are active right now. Real-time spot counts, top contacts, ranked recommendations.

Historical Trends 7, 14, 30, or 90 days of SFI and K-index history with trend indicators.

Contest Mode Full-screen glanceable dashboard when you're in a pileup. Large K-index, SFI, A-index, band recommendations - one look.

NOAA Satellite Pass Predictions Next 5 passes for NOAA-18, 19, and METOP from your location.

QSO Logbook Log contacts with solar conditions auto-attached. Export to ADIF or Cabrillo for LoTW, eQSL, award submissions.

Apple Watch K-index and best band at a glance. Complications for all watch faces.

No account required. No subscription. No ads. Your data stays on your device.

SUPPORTS: iOS 17+, watchOS 10+