DragTree

DragTree is a reaction-time game built on a real NHRA Christmas Tree (the drag strip starting lights). Watch the ambers, react to the green, and see how fast you were. Beat your best, or beat a friend.

Launch it however you like:

• Motion sensor — mount the phone in the car, stage, and drive off. The app detects the launch and times it from the start of acceleration. No tapping.

• Tap — a big on-screen button.

• Hold to Launch — hold the button through the tree and let go on green, like a trans-brake button.

• Volume buttons and remotes — use a volume button, a wired headphone button, or a cheap Bluetooth camera-shutter remote as your launch button (Settings, off by default).

Fully offline — no internet, no account, no ads, no tracking.

TWO PLAYER

Put the phone between two people. Each gets their own lane and light; best reaction wins, and a red light loses.

TREES

• Pro Tree (.400) — all three ambers together, green 0.400 s later

• Sportsman Tree (.500) — ambers count down one at a time, green 0.500 s after the last

GRADES

Perfect (under .050) · Pro · Great · Good · Late · Red Light, which shows how early you went.

TRACK YOUR PROGRESS

• History of your last 30 runs, personal best, and a trend chart

• Consistency stats: average, spread, how often you land within ±.020, and your streak

• Series mode: 3, 5 or 10 runs back to back with a summary

• Time-slip comparison: enter the reaction time from a real slip and see how your phone differs

BUILT FOR PRECISION

• The motion sensor is read up to 200 times a second with the sensor's own timestamps, on phones with or without a gyroscope

• Accelerometer test: records 5 seconds of background vibration and suggests the most sensitive setting it won't trip

• Phone latency check: screen rate, sensor rate and a tap test, so you know how much of a time is the phone

• Three sensitivity presets plus a custom setting

Optional sounds: a tick on each amber, a beep at green and a chime for your result.