Twofold Weather

Every temperature in °C and °F, actual and feels like. New: a bright look, Today, Week, Briefing and Details on one bar, and cards you can move, shrink or remove.

Weather for people who live between °C and °F, corrected by the station near you, with the sources shown.

BOTH SCALES, EVERYWHERE Actual and feels-like temperatures appear in Celsius and Fahrenheit together on Today, in widgets and on the Lock Screen. Both are the default: choose which comes first, or show one alone.

CORRECTED BY THE STATION NEAR YOU When a nearby station reads warmer or colder than the forecast model, Twofold moves the next hours towards the station's reading and fades the change out over 12 hours. In the US that is a National Weather Service station; elsewhere, a nearby airport report. The hourly forecast says when.

SEVEN MODELS, AVERAGED Forecast temperatures are the average of up to seven weather models. In a week-long check against 18 airport stations, the average was closer than any single model.

ONE FEELS-LIKE FORMULA, NAMED Feels like follows the National Weather Service: wind chill in cold wind, heat index in humid heat, and the air temperature in between. It is worked out the same way for every place and provider, and the app tells you which formula applies.

THE SOURCES, SHOWN Weather sources, in Settings, lists each reading's provider, station, distance and time, and whether a station measured it or a model estimated it. Old readings are labelled, and missing data is shown as missing, never as zero.

TODAY, KEPT SHORT On a bright sky in the colours of the weather: the current reading in one of five layouts and one card of hours, each temperature in its own colour. The card switches to 24-hour graphs of temperature, rain, wind, humidity or UV; drag right for up to three earlier hours from the forecast model. The last row opens Past week. Swipe down for tonight's Moon: phase, moonrise, moonset and the next 30 nights.

DETAILS, YOUR WAY UV index and the other measurements are on Details; each tile opens more. Swipe down for what each reading means for you and for the weather. Long press a card to drag it, move it between Today and Details, resize it or remove it.

PAST WEEK See yesterday's weather and how the last seven days of forecasts compared with the model's record of each day.

THE WEEK AT A GLANCE Up to ten days on one page, with a headline when something stands out and tags such as Frost or Wettest. Swipe down for yesterday. Tap a day for its sunrise, sunset and daylight.

THE BRIEFING Right now, this hour, today and this week, in short hand-written lines filled in from real readings. Swipe down for Activities: a rating for walking, running, cycling, hiking, stargazing and drying laundry, and the best time in the next 24 hours.

A VOICE, IF YOU WANT ONE A short line in the hourly card, Plain, Friendly or Cheeky, with an opt-in Roast. Every line is written by hand and matches the readings and the place.

FORECAST ALERTS Set alerts for temperature, feels like, rain chance, wind gusts or UV. They are local notifications planned on your device when the app refreshes, not official warnings. For saved US and Canadian cities, Twofold can also tell you about new official alerts. An optional Live Activity shows rain or snow due within two hours on the Lock Screen, as a model estimate.

AIR QUALITY AND POLLEN US and European air quality index, PM2.5, PM10, ozone and nitrogen dioxide; Indian cities lead with India's National AQI. Pollen in Europe.

WIDGETS AND APPLE WATCH Nine Home Screen widgets and 14 single-detail Lock Screen widgets, each following the app's city or a saved place. The Apple Watch app and complications show your cities in your scales.

YOUR PLACES Save up to 12 cities. The round city button switches between them.

FREE AND PRIVATE No account, ads, tracking, subscriptions or purchases. Location permission is optional.

DATA SOURCES Forecasts: Open-Meteo (CC BY 4.0). Air quality and pollen: Copernicus Atmosphere Monitoring Service (CAMS) via Open-Meteo. Observations and alerts: the National Weather Service, NOAA's Aviation Weather Center and Environment and Climate Change Canada.