GPS Speedometer

A minimalist, privacy-focused Android speedometer built with Kotlin and Jetpack Compose. It provides real-time GPS data with a high-contrast HUD interface designed for readability.

Motivation

I got tired of dirty ad filled, user tracking, etc speedometer apps, so I made this simple one. Download the APK from Releases or build from source.

Installation

Download and install the APK from Releases or build from source.

Features

• Real-time Speed: Centered display in km/h with dynamic font sizing to fit any screen width.
• Satellite Status: Real-time GNSS satellite count with a color-coded status indicator (Red/Green).
• Session Statistics:
  • Top Speed: Tracks the maximum speed reached in the current session.
  • Top Satellites: Tracks the maximum number of satellites connected.
• Smart Logic:
  • 5-Second Warmup: Max speed tracking only begins 5 seconds after GPS lock to prevent initialization spikes.
  • Tunnel Detection: Automatically resets speed to 0 if GPS data stops for >2 seconds.
  • Noise Filter: Ignores "drift" speeds (< 1.5 km/h) and low-accuracy fixes (> 50m radius).
• Privacy & Cleanliness:
  • No Ads: Completely free and clean interface.
  • No Tracking: No analytics, no data collection, no internet permission required.
  • No Background Drain: App completely stops GPS usage when minimized to save battery.

Session Behavior

Note: This app is designed as an active dashboard.

• Active Only: Speed and stats are tracked only while the screen is on and the app is visible.
• Auto-Reset: Minimizing the app, turning off the screen, or switching apps immediately wipes all session data (current speed, max speed, satellite counts).
• Battery Safe: The app aggressively disconnects from the GPS hardware the moment it loses focus.

Preview

Tech Stack

• Language: Kotlin
• UI Framework: Jetpack Compose (Material3)
• API: Android LocationManager & GnssStatus (Raw GPS access)
• Architecture: Lifecycle-aware components with Coroutines for watchdog timers.
• Min SDK: 24
• Target SDK: 34

Build & Install (CLI)

1. Clone

   git clone <repo_url>
   cd gps-speedometer

2. Build & Install (Using Makefile)

   make install

   Or manually: ./gradlew assembleRelease && adb install -r app/build/outputs/apk/release/app-release.apk

License

MIT