Activity profiles
Wind matters for a ride, UV for a beach day, temperature for a stroller walk. Each activity carries its own thresholds and gets judged on them.
Features
Built to give an answer, not data.
Gwhen is a small app with one strong opinion: the time is the product. Everything else supports it.
Gwhen timeline
An organic, bar-based read of the day with a continuous silhouette over the recommended stretch. No axes, no line graphs, no interpretation required.
Plain-language reasoning
Every window comes with one sentence of why — 'cool and calm before the wind builds' — so the recommendation is trustable, not magic.
Honest compromise states
When the day has nothing good, Gwhen says so and offers the least-bad option with a caveat instead of dressing up a poor forecast.
Days ahead at a glance
Each activity carries a short outlook so you can shift a plan to Thursday morning before Thursday morning arrives.
iOS moments
Implication-first notifications on the Lock Screen, a live countdown in the Dynamic Island, and a Live Activity while your window is open.
Best window today
6:20–7:50 AM
5AM6AM7AM8AM10AM
6:20–7:50 AM
Cool temperatures, light wind and dry conditions make this today's strongest riding window. Wind picks up noticeably after 8.
Go when it's good.
Add the activities you care about. Gwhen watches the forecast and tells you the one time worth clearing your calendar for.
Coming soonComing soon