Halo Air | The world's first environmental sensor for your phone

Hey Product Hunt! After a year of tinkering with my co‑founder Harry, we’re finally shipping the environmental sensor for your phone: Halo Air—now live on Kickstarter. Why we built this: + Indoor CO₂ routinely spikes over 2,000 ppm in NYC cafés and subway cars—yet most pocket monitors only track one metric, use coin cells, or look like pagers from 1999. We wanted something that: + Travels as easily as a phone case (MagSafe snap‑on, no cables). + Logs every pollutant we care about at once—CO₂ and PM1/2.5/10 and t‑VOCs—plus temp, humidity, and pressure for context. Unable to find it, we built it. What’s new & unique: + MagSafe form factor: first sensor that rides on your phone, so you never forget or misplace it. + Six‑in‑one sensing array, USB‑C rechargeable: no disposable batteries. + On‑device ML: flags likely pollutant sources and suggests fixes + Live lock‑screen widget: zero‑friction insights. + Price parity with single‑param monitors: early‑bird backers get the full stack for less than most standalone CO₂ meters. What we’re most proud of: Cramming eight calibrated sensors, a Li‑ion pack, and BLE radio into a 7 mm shell. We’d love your thoughts, feature wishes, or brutal honesty. If Halo Air helps you breathe (and build) better, consider grabbing an early‑bird spot or just drop a comment—we’re listening. Thanks for checking us out! 🙏