Solar Weather vs Comparecast

Solar Weather brings real-time space weather monitoring to your pocket. Track the planetary Kp-index, forecast magnetic storms, and follow moon phases — all in one beautifully designed app. SOLAR WIND See the solar wind that drives it all — speed, plus the all-important Bz and Bt magnetic field straight from NOAA's DSCOVR satellite, with a 24-hour Bz trend. A southward Bz is the earliest sign that a storm and aurora are building. NOAA STORM SCALES Follow the three official NOAA scales at a glance — geomagnetic storms (G), solar radiation storms (S) and radio blackouts (R) — with a 3-day outlook. Turn on alerts for radiation storms and radio blackouts, too. REAL-TIME KP-INDEX Monitor the current geomagnetic activity level on a clear 0–9 scale with color-coded status. See hourly charts for the last 24 hours and spot trends at a glance. STORM FORECASTS View 24-hour and 27-day geomagnetic forecasts sourced from NOAA. Know when the next magnetic storm is coming before it affects your health, electronics, or aurora visibility. MOON PHASE CALENDAR Browse an interactive monthly calendar showing the moon phase for every day. Tap any date to see the lunar day, illumination percentage, and days until the next full or new moon. SMART NOTIFICATIONS Choose exactly which alerts matter to you: • Magnetosphere excited (Kp 2–3) • Magnetic storm detected (Kp 4+) • Severe storm warning (Kp 7+) • Full moon — 2 days, 1 day, or day-of • New moon — 2 days, 1 day, or day-of EDUCATIONAL ARTICLES Learn what the magnetosphere is, how K-index works, how geomagnetic storms affect health, and why the aurora borealis happens. ASK SIRI Just ask Siri — “Is there a magnetic storm?”, “What's the moon phase?” or “What's the solar activity?” — for an instant answer. The same shortcuts work from Spotlight and the Shortcuts app. WIDGETS & LIVE ACTIVITY Keep the current Kp-index, aurora chance, and moon phase on your Home and Lock Screen. When a magnetic storm is underway, a Live Activity shows live readings on your Lock Screen and in StandBy. FEATURES • Real-time Kp-index with hourly bar charts • 24-hour and 27-day storm forecasts from NOAA • Interactive moon phase calendar • 11 configurable push notification types • Real-time solar wind (speed, Bz, Bt) with a 24-hour trend • Official NOAA G/S/R storm scales with a 3-day outlook • Offline moon calculations — works without internet • Dark theme designed for space weather • Available in 17 languages • Ask Siri & Spotlight — storms, moon phase, solar activity • Home Screen & Lock Screen widgets, plus a storm Live Activity • Apple Watch app • Optimized for iPhone and iPad • Built-in knowledge hub with an illustrated glossary • No ads. No tracking. Free forever.

Most weather apps show you one number. Weather Source shows you what every major forecast model actually says, so you know when they agree, when they disagree, and which one to trust for your location. WHY MORE THAN ONE MODEL? Every forecast you've ever seen came from a numerical weather model. Each model is a supercomputer running its own simulation of the atmosphere, with slightly different starting data and slightly different math. GFS (USA), ECMWF (Europe), ICON (Germany), and the rest can disagree by 5° or more for the same hour at the same place. Apps that use a single source hide that uncertainty. Weather Source surfaces it. WHAT'S INSIDE • Seven independent forecast models from the world's top weather centers, side by side • A consensus card that shows, at a glance, how tightly the models agree on today's high • Interactive Compare chart that lets you drag across any future hour or day to see what every enabled model predicts for temperature, precipitation, or wind • Hourly chart you can drag horizontally to read the exact value at any future hour • Forecasts for the next 10 days with highs, lows, conditions, and rain probability • Live weather station map where you can tap any METAR station for the latest observation, with wind direction shown in compass points • Day and night backdrop that flips automatically at sunrise and sunset • Pull down anywhere to refresh MAKE IT YOURS • Choose your default forecast model per location • Toggle which models appear in Compare • Use your own units for temperature (Celsius or Fahrenheit), wind (km/h, mph, knots, or m/s), and precipitation (millimeters or inches) • Save as many locations as you want, and search any city on Earth LIVE DATA, NO ACCOUNTS Weather Source needs no account and never asks you to sign up. There are no ads, no tracking, and no analytics. Forecasts come from Open‑Meteo's free weather API. Live station observations come straight from NOAA's Aviation Weather Center. Your location data never leaves your device. WHO IT'S FOR Pilots reading aviation winds. Sailors plotting a passage. Hikers checking mountain forecasts. Photographers chasing golden hour. Growers timing irrigation. Storm chasers comparing models. Commuters who just want to know if it'll rain. Anyone tired of weather apps that pretend the forecast is a single confident number when it isn't. DATA SOURCES • Open‑Meteo (open-meteo.com) provides the forecasts from multiple weather models, plus city search • NOAA Aviation Weather Center (aviationweather.gov) provides METAR observations from thousands of stations worldwide Weather Source is for people who care which model their forecast came from.