Only when you can see it.
Most aurora alerts fire whenever the sun does something. Clear North waits until three things are true where you are, so a ping means the sky is worth stepping outside for.
- Platforms
- iPhone
- Price
- Free, with Pro yearly or lifetime
- Help
- Support Privacy policy
Quiet by default, loud when it matters
- 01
Tonight
A plain verdict (Likely, Possible, or Unlikely) with the best viewing window and an hour-by-hour view.
- 02
Alerts you control
A nightly limit (default 2) and quiet hours keep it from nagging. An optional dusk heads-up is a forecast note around sunset on a good-looking night; it says what to expect after dark, not that aurora is visible.
- 03
Wake me for major storms
Optional. Kp 7+ storms can arrive as time-sensitive notifications, even during quiet hours, but still only when it is dark and clear.
- 04
Outlook
The next three nights, a rough 27-day guide, and a look at what the sun has been doing.
- 05
Red night-vision mode
A red-only display that protects your dark-adapted eyes while you are out watching.
- 06
Coarse location only
The app rounds your position on your device to a large grid cell. Precise coordinates are never sent. No account, no ads, no tracking.
An alert fires only when all three hold.
-
Dark
It is astronomical darkness at your location, not just after sunset.
-
Clear
Cloud cover is under 40%, from MET Norway forecasts.
-
Strong
The Kp index is high enough for your latitude (for example Kp 6+ at 45°N), from NOAA SWPC.
Check tonight free. Unlock the alerts.
- Clear North Free
Free
- Tonight’s verdict
- Best window and hour-by-hour view
- Red night-vision mode
- Clear North Pro
Yearly or lifetime
- Aurora alerts
- 3-night and 27-day outlook
- Multiple locations
- Yearly plan includes a 7-day free trial
- Or buy Pro once, for life
Prices will be shown in the App Store at launch.
Need help with Clear North: Aurora Alerts?
Send a note with what you were doing and what you expected to happen. I read every one.
Cloud forecasts: MET Norway (licensed CC BY 4.0). Geomagnetic data: NOAA Space Weather Prediction Center. Clear North is an independent app and is not endorsed by MET Norway or NOAA.