Sun Compass
The sun's path on the map
Pick any place and any date: the sun's path appears on the satellite map, in 2D or 3D, with sunrise, sunset, solar noon and the solstices, in the local time zone.
For iPhone
The sun of your project, from the map to the facade.
Sun path, shadows, solar energy estimates and facade sun studies on your iPhone, with data from NOAA, NASA and Apple Weather.
Sun Compass
Sun AR
Shadows
Panel 3D
Comfort & Facades
A look inside SunArch
Made for people who work with the sun
From the first project sketch to the late-afternoon photo: the same sun, calculated for the place and date you choose.
Architecture & comfort
Facade sun exposure, overhangs and room orientation, with a bioclimatic PDF study for your client.
Solar energy
Ideal panel tilt and orientation, estimated generation and sizing from your electricity bill.
Homes & land
See where the sun hits at every hour and season before you buy, build or sell.
Photography & sky
Golden hour, blue hour, the sun and the moon on the camera, Kp index and aurora chances.
Everything the sun does, in one app
Calculated on your iPhone with NOAA's solar equations.
Comfort & Facades
The sun on the window, measured with the camera
Point your iPhone at the facade: the app measures its orientation and shows how much of the window is shaded by the overhang in summer and winter. Room ratings on the map and a bioclimatic PDF report.
Panel 3D
The solar panel facing the real sun
See the power right now, with clear sky and with Apple Weather clouds, today's energy and the ideal tilt. Every estimated number is labeled as an estimate, with its source.
And more precision tools
Sun Timer, Kp Index and Solar Flux are free for everyone.
Sun AR
The sun's path, the solstices and the moon drawn over the camera image.
Shadow Tracker
Draw your house on the map and see its shadow to scale, hour by hour, with a PDF sheet.
Panel Angles
Measure your roof's tilt with the iPhone and compare it with the ideal angle for the day and the year.
Sun Timer
Sunrise, sunset, golden hour and blue hour for the chosen place, with a 3D sky dome.
Solar Flux
Live X-rays from the GOES satellites, solar flares and the F10.7 radio flux, from NOAA.
Kp Index
Observed and forecast geomagnetic activity, and how far the aurora may reach.
Numbers with a source
Nothing made up: when a value is an estimate, the app says so and where it comes from.
NOAA
Sun position from NOAA's solar equations and space weather from the SWPC.
NASA POWER
25-year climatology (2001–2025): irradiation, temperature, humidity and wind.
Apple Weather
Hourly weather and cloud cover.
PVEducation
Clear-sky model for the estimated panel generation.
Free to start. Pro to design.
Use the essentials for free. Subscribe to SunArch Pro when you need any date, any place and the reports.
Free
- Sun Timer, Kp Index and Solar Flux without limits
- Sun Compass with dates up to 15 days from today
- Places up to 500 m from where you are
- Sun AR with the 1× lens, for today
- One solar site and the live Panel 3D
SunArch Pro
- Any date and any place in the world
- Full Comfort & Facades
- Professional PDF reports
- Panel Angles and multiple solar sites on iCloud
- Sun AR with the 0.5× lens, solstices, other dates and technical photos
Weekly or monthly subscription, with a 3-day free trial for new subscribers. Cancel anytime in your Apple Account settings.
No account, no ads, no tracking
Calculations happen on your iPhone and your solar sites stay in your private iCloud. We never receive your location.
The sun of any place, in the palm of your hand.
SunArch for iPhone.
iOS 17 or later