Hey Product Hunt 👋

My wife and I kept arguing about which of us is the worse driver. Neither of us could prove anything, so I built a referee.

Two weeks of data later the referee ruled against both of us. We're both aggressive drivers. I lost the argument and found a product on the same day.

That's the actual gap: every driver gets feedback on where they drove, never on how. Insurance apps do score you, but they keep the data and never show you the reasoning.

ZenDriver Coach reads your iPhone's motion sensors and GPS and turns them into a live 0–10 Carefulness Score. The score isn't one number from one signal — it weighs speed, the road's actual posted limit, acceleration and braking, jerk (how abruptly those changes happen), road bumps, and cornering force. That's why a "smooth" 50 in a 30 zone doesn't pass as calm driving: the context counts, not just the g-forces.

Validated on UAH-DriveSet (6 drivers, 500+ min of labeled normal/drowsy/aggressive driving on identical routes) — the score cleanly separated aggressive runs from normal ones.

Works with CarPlay. Android is next.

First 3 trips are free. For Product Hunt: PHLAUNCH unlocks 3 days of Pro — Settings → Redeem code, or here: https://apps.apple.com/redeem?ct...

Eugene, building this solo with a huge help of AI. Still losing to my wife on cornering.

ZenDriver Coach

Become a Better Driver

Become a Better Driver