HAMSignal
Solar Weather for HAM Radio
$3.99 · Designed for iPad. Not verified for macOS.
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.
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**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.
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No account required. No subscription. No ads.
Your data stays on your device.
SUPPORTS: iOS 17+, watchOS 10+
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Added functionality to find repeaters, ARPS, and satellites.
The developer, Stephen Thorn, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Stephen Thorn
- Size
- 4.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © 2026 Stephen Thorn
