PSYCHOVISUAL WEATHER · iOS + ANDROID
Weather
you feel.
Charts make you decode. Kelvin makes you feel. Your next 96 hours, rendered as living color — warm means hot, deep blue means cold, and the texture between tells you what the sky is doing.
NO ACCOUNTS · NO TRACKING · FORECAST BY APPLE WEATHERKIT
TUESDAY · LONDON
18°
ONE SWIPE, FOUR WORLDS
Every metric has its own palette.
Swipe horizontally and the entire week re-tints around a different variable — each mapped onto colors tuned for how humans actually perceive that value.
TEMPERATURE
−10°C → 40°CCobalt frost through spring lime into sunset coral — cold reads calm, heat reads urgent.
UV INDEX
0 → 11+Emerald mornings, crimson noon, violet extremes — burn risk visible before you step out.
WIND
0 → 60 km/hSeafoam stillness building into electric azure gales.
HUMIDITY
0 → 100%Crisp arid air sinking into deep-trench moisture.
WHY KELVIN
Built like an instrument, not a dashboard.
Scrollable time
Ninety-six hour-strips stack into one continuous scroll. Feel the cold front arrive on Thursday without reading a single number.
Live at the edge
Forecasts come straight from Apple WeatherKit through our own edge cache — fast, resilient offline, and honest about its sources.
Private by design
No accounts, no analytics SDKs, no ad networks. Your location is rounded, fetched, and forgotten. That's the whole story.
QUESTIONS
Before you ask.
What does Kelvin Pro include? ›
Pro unlocks every theme palette, unlimited saved locations, and all future premium features. One simple yearly plan or a lifetime pass — no monthly subscription games.
Why do nearby cities sometimes show identical forecasts? ›
Kelvin rounds locations to roughly one kilometer so forecasts can be served instantly from cache. Within that radius the weather is effectively the same anyway.
Does Kelvin work without my location? ›
Completely. Decline the permission and just search for cities — everything works the same.
Where does the weather data come from? ›
Apple WeatherKit — the same data source behind the iPhone's own Weather app.
Read your week in color.
Kelvin is free to download. Pro is one flat yearly price — or pay once, keep it forever.
LAUNCHING SOON ON BOTH STORES