DragTree
- Hold to Launch: hold through the tree, let go on green
- Launch with volume buttons, headphone or Bluetooth remote buttons
- Motion sensor up to 200 readings a second; sensor times are more accurate and may read slightly slower
- Sensor launch on phones without a gyroscope
- Consistency stats, time-slip comparison, phone latency check
- New sounds; late launches timed to 5 s
- Better fit on small screens and large text
- One unused permission removed
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.
The reaction time shown is how quickly you responded after the green. A track time slip also includes the car's rollout and drivetrain response, so DragTree is best for practice and consistency, not for predicting your exact slip.
PERMISSIONS
• HIGH_SAMPLING_RATE_SENSORS — fast motion-sensor readings
• VIBRATE — touch feedback
• MODIFY_AUDIO_SETTINGS — plays the sound effects
There is no internet permission at all, and no microphone, location or storage access.
- Author: flyboy-byte
- License: MIT License
- Website
- Issue Tracker
- Source Code
- Build Metadata
- Reproducibility Status
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Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
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x86_64This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
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x86This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
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arm64-v8aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 31 MiB PGP Signature | Build Log
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armeabi-v7aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 27 MiB PGP Signature | Build Log
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x86_64This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
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x86This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
-
arm64-v8aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 31 MiB PGP Signature | Build Log
-
armeabi-v7aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 27 MiB PGP Signature | Build Log
-
x86_64This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
-
x86This version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 32 MiB PGP Signature | Build Log
-
arm64-v8aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 31 MiB PGP Signature | Build Log
-
armeabi-v7aThis version requires Android 7.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 27 MiB PGP Signature | Build Log
- Red lights show how early you went instead of a fixed value
- Series stats now include late runs
- Title no longer wraps on narrow screens; footer shows the real version