Kaisei Weather. The forecast, in a terminal.
快晴kaiseiJapanese for a clear, cloudless sky
Apple Weather forecasts with flat panels, monospaced type and pixel art where other apps put a spinner. Seven widgets, sixteen themes, severe weather alerts you opt into - and not one line of tracking.
- No account
- No ads
- No tracking
Everything you check the weather for. Nothing else.
Every forecast in the app is free.
Your places, one page each
Where you are plus up to five saved cities. Swipe between them - each keeps its own clock.
Today, in detail
Rain by the minute for the next hour, a 24-hour strip, and a plain line on the next twelve.
Ten days, and the night sky
Highs and lows on one scale. Sunrise, golden hour, moon phase and how long it stays dark.
Severe weather alerts
Opt in for severe and extreme warnings, in the agency's own words, composed on your iPhone.
Sixteen themes. Eight of them free.
Dark ones and light ones, from Tokyo Neon to Washi Paper - each previewed on your own forecast before you commit. Your widgets wear the theme too.
Want more? Buy a coffee.
Three one-time purchases, each unlocking its own extra themes. Not subscriptions, they don’t stack, they’re Family Sharing enabled - and they unlock nothing but colours. No forecast, widget or alert is ever behind a paywall.
Espresso
- Espresso
- Sakura Dawn
Americano
- White Americano
- Sumi Ink
- Jasmine Tea
Latte
- Latte
- Hojicha Amber
- Yuzu Sun
+ a builder for your own theme
Seven widgets.
Small, medium and large on the Home Screen, with Daylight and Moon phase on the Lock Screen too.
Kaisei Weather
The whole picture: conditions now, the coming hours, the next days, and one line of warning if there is one.
Hourly
Temperature across the coming hours, nothing else.
Hourly Rain
The same hours with rain underneath them.
Umbrella
One answer about the next twelve hours: take one, maybe, or leave it.
Daylight
Sunrise, sunset and how much light is left today.
Night sky
Tonight's moon, how long the sky stays dark, and whether cloud will be in the way.
Moon phase
The moon tonight, and nothing to distract from it.
We could not look at your data if we wanted to
Everything in the app is Apple’s own - not one third-party framework. It talks only to Apple, and only with what it needs to fetch a forecast.
No account
No sign-up, no email address, no password. The app never asks who you are.
No servers of ours
No backend, no database, no cloud storage. Nothing is ever sent to us.
No analytics, no ads
No crash-reporting SDK, no advertising identifier, not one third-party framework.
Location rounded first
Coordinates are rounded to about a kilometre before a request leaves your iPhone - and they go only to Apple.
Local notifications
Alerts are composed on your device. No push server, no device token - nobody can send you anything through the app.
Stays on your iPhone
Settings, saved cities and cached forecasts live on your device and nowhere else. Delete the app, delete it all.
Clear skies, in your pocket.
Kaisei (快晴) is Japanese for a clear, cloudless sky.
iPhone · iOS 26+ · Free
Questions, terms and privacy
Something not working, or a question about your data? Write to us by email. The terms and privacy policy below are the ones the app links to.
Contact
Bug reports, feature ideas, privacy requests - all by email.
hello@cutthefluff.euTerms of Service
Your licence, the limits of weather data and alerts, purchases and your consumer rights.
Read the termsPrivacy Policy
What the app processes, what it never collects, and how to exercise your rights.
Read the policyWeather data provided by Apple Weather, including the forecast values shown in the screenshots on this page. Apple, iPhone, App Store and Apple Weather are trademarks of Apple Inc. Kaisei Weather is not affiliated with, endorsed by or sponsored by Apple.