FORECAST CONFIDENCE

The second opinion for your weather app.

Most weather apps blend several forecast models into one number. Chorus shows you where they disagree, so you know how much to trust it.

Download on the App Store Free for iPhone, with Chorus Plus
The Chorus rain view for London: models agree, rain arrives 23:00–02:00, how many models show rain each hour, and typical and wettest amounts
The Chorus forecast for Tokyo: Mixed, “Some models show rain, others don't”, 21°, the 24-hour chart with each model's line and the bold forecast on top, and the 7-day outlook

Your weather app's widget tells you the forecast. Chorus's tells you whether to trust it.

Widgets for your Home Screen and Lock Screen show the confidence for the next 24 hours, and what the models disagree about. They come with Chorus Plus.

Medium and small Chorus widgets on the Home Screen for New York: Mixed on temperature, 15°, with each model now and the next 24 hours
Home Screen. Small and medium widgets.
Chorus Lock Screen widgets: “Models agree · 13°” above the clock, a rectangular widget with the 24-hour strip, and the circular ring at 13°
Lock Screen. Inline, rectangular and circular.

One answer to check first: do the models agree?

Agree

The models tell much the same story. There's little disagreement to second-guess.

Mixed

Some models differ, on the temperature or on whether or how hard it rains. Worth checking again later.

Split

The models tell different stories. Have a plan B.

Made to sit beside the weather app you already use.

Every model on the chart

ECMWF, GFS, ICON and the UK Met Office, each drawn as its own line, with the blend on top.

Every hour and every day

Agree, Mixed or Split for right now, the next 24 hours and the week ahead, so you know when to look again.

Widgets that answer at a glance

On your Home Screen and Lock Screen: the state, the temperature and when the models disagree.

Sharper where it covers you

Across the UK and nearby, Chorus includes the Met Office's 2 km model for the first two and a half days.

Private by design

Your location is rounded to about 2 km, used only to fetch your forecast, and never stored or shared.

Your models, your places

With Chorus Plus, compare any of six models or follow one, and save up to 20 places.

Chorus is free. Chorus Plus goes further.

Home and Lock Screen widgets, your choice of six models to compare or follow, and up to 20 saved places. Try it free for a week.

Download on the App Store Free for iPhone, with Chorus Plus