Semicolon is a native iOS hazard dashcam for bikes, scooters, and cars. Multicam capture, LiDAR-aware perception, on-device voice — the clip, the GPS, and the heatmap the city actually needs.
/ pipeline
Bike, scooter, or car — the same perception loop, voice layer, and danger-segment store. Detection in the moment, evidence after the fact, aggregated insight for the people who set the speed limits.
Rider-mounted detection of vehicles, pedestrians, door zones, blocked bike lanes.
Same pipeline at scooter speeds and on shared micro-mobility paths.
Dashcam mode warning drivers about cyclists, pedestrians, unsafe passing.
/ on the road
Two clips straight from an iPhone. The left shows the app in motion; the right shows the depth-aware feed with the multicam preview and live YOLO overlay.
/ product
Four small pieces that add up to one calm, capable safety co-pilot for everyone sharing the road.
AVCaptureMultiCamSession runs front + rear simultaneously, frames stream to a YOLOv8 sidecar, and ARKit scene-depth fuses LiDAR distance into the risk score. Close passes, doorings, blocked bike lanes, pedestrian conflicts — flagged in real time.
AVSpeechSynthesizer speaks the tuned warning on-device the moment severity crosses threshold — no cloud round-trip, no audio latency. The rolling 60-second clip is locked, uploaded, and added to the gallery.
Every saved clip lands in MongoDB Atlas with a 2dsphere geo index, a thumbnail, and full telemetry — speed, heading, severity, ride mode. Replay the ride in 3D from the records console; export the corridor report.
When the same corridor lights up across riders, events aggregate into geofenced danger segments — a heatmap city traffic engineers can actually act on, and a per-corridor incident report.
/ stack
/ flow
Bar-mount on a bike or scooter; vent-mount in a car. Pick a ride mode and the multicam perception loop begins.
YOLO scores each frame, LiDAR boosts the risk in tight passes, and AVSpeechSynthesizer voices the alert when severity crosses threshold. Or just say "save clip."
Open the records console for the 3D ride replay, the danger-zone heatmap, and the corridor incident report.