Four windows a day
Morning, midday, afternoon and evening each get their own Trail Score from 0 to 100 and a clear verdict: GO, MAYBE or NO. The best slot of the day is marked, but only if it is actually good.
Trail weather for mountain bikers
Know tonight whether tomorrow is worth riding.
GripCast scores every part of the next five days for mountain biking. It reads the forecast and the soil moisture, so it knows when the trail is still wet from yesterday’s rain. If tomorrow looks good in your ride windows, it tells you at 7 p.m.
Coming soon to Google Play
- Free
- No ads
- No account
GripCastGood weather window tomorrow 06:00–10:00, but trails are still damp. 14°C, Trail Score 75.
How it works
A verdict for every part of the day
Yesterday’s rain counts
Sunshine after a stormy night does not make a dry trail. GripCast combines soil moisture data with the rain of the past days and estimates, window by window, how much grip the ground has.
Thunderstorm means NO
If a window carries thunderstorm risk, it is NO, however good the score looks. The other windows keep their own verdict, so a stormy afternoon does not cancel your morning ride.
The 7 p.m. alert
One message, when it matters
This is what GripCast is built for. You set when you can ride, separately for weekdays and weekends, and from which Trail Score a slot counts as good (70 by default). Every evening GripCast checks tomorrow against exactly those windows.
- Only your ride windows count. A perfect morning does not help if you can only ride after work.
- If the forecast flips overnight, a short correction arrives early in the morning.
- During long stretches of good weather it stays quiet instead of pinging you every evening.
RIDE WINDOWS
WEEKDAYS17:00–21:00
WEEKEND08:00–18:00
NOTIFY FROM SCORE
70
Privacy
Your position stays on your phone
No account, no ads, no analytics
There is nothing to sign up for. Your settings stay on your device.
Rounded before it leaves
Every coordinate is rounded on your phone first: to about 10 km for the weather, to about 3 km for the place name.
Delete with one tap
Server data exists only while notifications are on. “Delete server data” in the settings removes it at once.
FAQ
Questions riders ask
How does GripCast know whether the trail is dry?
It cannot see your trail, but it knows what fell on it. GripCast takes soil moisture data for your area and the rain of the past days, estimates how wet the ground is and how it develops during the day, and turns that into the traction part of the Trail Score. Rocky and sandy trails dry faster than clay or forest floor, so read it as an estimate for your region.
Is GripCast free?
Yes. No ads, no subscription, no account.
Which phones does it run on?
Android 7.0 or newer. There is no iPhone version yet.
Where does it work?
Forecasts come from Open-Meteo and cover most of the world. GripCast is developed and tested on trails in Switzerland.
Does GripCast track my location?
No. You set your location once, by typing a place name or with a single GPS tap. Nothing runs in the background to locate you.