Dark Sky Meter Pro vs SkyQI

Dark Sky Meter Pro turns your iPhone’s camera into a sky brightness meter. Point at the night sky to get scientific readings in SQM (magnitudes per square arcsecond) and Bortle scale, plus NELM (naked-eye limiting magnitude) and an estimate of visible stars—so you can track light pollution and compare sites. Measure One-tap measurement: cover the lens for a dark frame, then point at the sky. Results in seconds. Device-specific calibration (zero point) for better accuracy; optional FOV setting (default 20° for SQM-style comparison). Readings include location and time for your records. My Data Save measurements locally and, with Sign in with Apple, sync across your devices. Export to CSV for analysis or sharing. Review history with SQM, Bortle, NELM, and location. Clouds Simple cloud forecast for your location so you can plan when to go out. Map See your (and optionally others’) measurements on a map to compare sky quality by place. Info Sunrise, sunset, and darkness window; moon phase, moonrise, and moonset for your location. Built for stargazers, astrophotographers, researchers, and anyone curious about light pollution and dark skies. No extra hardware—just your iPhone.

SkyQI turns your smartphone into a sky quality meter. Upload a photo of the night sky and our algorithm instantly analyzes it — detecting stars, measuring artificial light contamination, and calculating your sky's Bortle class and SQM value. FEATURES • Instant Analysis — Upload a night sky photo and get your Bortle scale (1-9) and SQM reading in seconds • Light Pollution Map — Explore an interactive map with NASA VIIRS satellite data overlay showing light pollution across India • Sky Conditions Forecast — Check cloud cover, seeing, and transparency before heading out to stargaze • Photo Gallery — Browse night sky photos from citizen scientists across the country • Learn — Read articles about light pollution, dark sky destinations, astrophotography tips, and more • Track Progress — View your measurement history and personal statistics WHO IS IT FOR? • Amateur astronomers planning observation sessions • Students and teachers doing citizen science projects • Anyone curious about the quality of their night sky • Environmental advocates tracking light pollution trends SkyQI is a citizen science project started by Suhani Gupta in Gurgaon. Every measurement you upload contributes to building India's most detailed light pollution database. Free to use. No account required to upload.