iOS App

Kuuki 空気

Real-time air quality, wherever you are.

Kuuki gives you live AQI data, detailed pollutant readings, and actionable health advice for any city in the world — so you can make informed decisions about your day.

Kuuki home screen showing AQI 63 (Moderate) in Hangzhou with pollutant breakdown and forecast
Home
City management screen listing multiple cities with their AQI values
Cities
Medium home screen widget showing AQI 42 (Good) with PM2.5 reading
Widget

AQI at a glance

Kuuki's interface changes color dynamically based on air quality — you know the situation before you read a number.

Good 0–50
Moderate 51–100
Unhealthy 101–200
Very Unhealthy 201–300
Hazardous 300+

Features

Real-time AQI

Live air quality index powered by the World Air Quality Index (WAQI) network — global coverage, updated hourly.

Pollutant Breakdown

See individual levels of PM2.5, PM10, O₃, and NO₂ — not just a single number.

8-Day Forecast

PM2.5 predictions for the next 8 days visualized as a bar chart. Plan outdoor activities ahead of time.

Health Advice

Actionable recommendations based on your current AQI level — from "enjoy the outdoors" to "wear an N95 mask".

Home Screen Widget

A WidgetKit widget that shows AQI and forecast right from your home screen — no need to open the app.

Multi-language

Full support for English, Simplified Chinese (简体中文), and Japanese (日本語). Switch in-app instantly.

Built with

SwiftUI Swift 5.9+ WidgetKit CoreLocation async/await WAQI API

Privacy Policy

Last updated: May 2026

Data we collect

  • Location — Used only to look up nearby air quality stations via the WAQI API. Your coordinates are sent directly to WAQI's servers and are not stored by Kuuki.
  • Saved cities — Stored locally on your device using UserDefaults. Never uploaded to any server.
  • Language preference — Stored locally on your device. Never shared.

Data we do not collect

  • No accounts or registration of any kind.
  • No analytics, crash reporting, or behavioral tracking.
  • No advertising or third-party SDKs.
  • No personal information (name, email, device identifiers).

Third-party services

Kuuki uses the World Air Quality Index (WAQI) API to fetch air quality data. When you request AQI for a location, your device sends that location's coordinates to WAQI's servers. Please refer to WAQI's privacy policy for details on how they handle this data.

Widget data

The home screen widget reads AQI data from a shared App Group container on your device. This data is never transmitted off-device by Kuuki.

Contact

For privacy questions or concerns: kuuki@meiki.dev

No ads, no tracking, no accounts required.

Support: kuuki@meiki.dev

© 2026 Kuuki