Bike Radar
Overlay and audio alerts for BLE bike radars. Offline, no account, no cloud.
新版本 1.7.0
First-run setup now plays a 20-second example ride with each traffic alert and what it means, then lets you set the alert volume with a test sound. A new Alert sounds page in Settings plays the alert sounds and opens the example ride and the volume step. With your eBike off, the home screen no longer asks if you finished your ride. The eBike's lock from an earlier ride no longer silences the drop alert. Settings shows when an app you allowed was blocked the last time it asked.
Bike Radar shows and sounds what your rear bike radar sees, on top of whatever app you are already running.
A thin strip down the edge of the screen shows each approaching vehicle's distance, closing speed and lateral position. Tiered beeps rise as the closest vehicle gets nearer, and a distinct urgent tone fires when an impact looks imminent - including while you are rolling slowly toward a junction with a fast vehicle behind. A clear chime sounds when the radar sees nothing left within your alert distance.
Everything runs on your phone: no account, no cloud, no analytics. The optional Home Assistant integration publishes ride stats to your own server and nowhere else. Another app on your phone can ask to use your radar, and nothing reaches it until you allow it on a screen naming the app; that handover happens on the device, app to app.
Features:
- Live overlay with per-vehicle distance, closing speed and lateral position
- Tiered proximity beeps, urgent imminent-impact tone, all-clear chime
- Post-ride summary notification: overtakes, close passes, distance, tightest pass
- Front camera/light auto mode by local sunset (one coarse location read per ride)
- Bosch Smart System eBike telemetry, strictly read-only
- Walk-away and forgot-to-lock reminders
- Optional Home Assistant publishing: batteries, close passes, ride summaries
- Sharing with another app on your phone (with your permission): the radar feed, and if you also allow it control of your tail light and hiding the overlay
- Optional on-device capture log for diagnostics, off by default and never uploaded
- English and Spanish
Requires a supported rear radar paired over Bluetooth (pair it once in system Settings) and Android 12 or newer. There is no standard Bluetooth profile for bike radars, so support is per model; the compatibility list on the project's source page says which units work, and the list is short.
A radar that reports distance only is expected to get the approach beeps, the all-clear and an overlay coloured by distance; the per-vehicle speed and side readouts, the urgent tone and close-pass counting need one that also reports closing speed and lateral position. The radar, camera and eBike integrations degrade gracefully: each works without the others.
Bike Radar is a riding aid, not a safety guarantee. It supplements your own attention and mirrors - it never replaces them.
This is an independent open-source project (GPL-3.0-or-later), not affiliated with or endorsed by any radar or eBike manufacturer.
A thin strip down the edge of the screen shows each approaching vehicle's distance, closing speed and lateral position. Tiered beeps rise as the closest vehicle gets nearer, and a distinct urgent tone fires when an impact looks imminent - including while you are rolling slowly toward a junction with a fast vehicle behind. A clear chime sounds when the radar sees nothing left within your alert distance.
Everything runs on your phone: no account, no cloud, no analytics. The optional Home Assistant integration publishes ride stats to your own server and nowhere else. Another app on your phone can ask to use your radar, and nothing reaches it until you allow it on a screen naming the app; that handover happens on the device, app to app.
Features:
- Live overlay with per-vehicle distance, closing speed and lateral position
- Tiered proximity beeps, urgent imminent-impact tone, all-clear chime
- Post-ride summary notification: overtakes, close passes, distance, tightest pass
- Front camera/light auto mode by local sunset (one coarse location read per ride)
- Bosch Smart System eBike telemetry, strictly read-only
- Walk-away and forgot-to-lock reminders
- Optional Home Assistant publishing: batteries, close passes, ride summaries
- Sharing with another app on your phone (with your permission): the radar feed, and if you also allow it control of your tail light and hiding the overlay
- Optional on-device capture log for diagnostics, off by default and never uploaded
- English and Spanish
Requires a supported rear radar paired over Bluetooth (pair it once in system Settings) and Android 12 or newer. There is no standard Bluetooth profile for bike radars, so support is per model; the compatibility list on the project's source page says which units work, and the list is short.
A radar that reports distance only is expected to get the approach beeps, the all-clear and an overlay coloured by distance; the per-vehicle speed and side readouts, the urgent tone and close-pass counting need one that also reports closing speed and lateral position. The radar, camera and eBike integrations degrade gracefully: each works without the others.
Bike Radar is a riding aid, not a safety guarantee. It supplements your own attention and mirrors - it never replaces them.
This is an independent open-source project (GPL-3.0-or-later), not affiliated with or endorsed by any radar or eBike manufacturer.
版本
尽管下面提供了 APK 安装包的下载选项，但你应该注意，以这种方式安装将不会收到更新通知，这是一种不太安全的下载方式。 我们建议你安装使用 F-Droid 客户端。
下载 F-Droid-
arm64-v8aarmeabi-v7ax86x86_64该版本需要 Android 12 及以上版本。
此包由原始开发者构建并签名，并保证对应于此源代码 tarball。
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arm64-v8aarmeabi-v7ax86x86_64该版本需要 Android 12 及以上版本。
此包由原始开发者构建并签名，并保证对应于此源代码 tarball。
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arm64-v8aarmeabi-v7ax86x86_64该版本需要 Android 12 及以上版本。
此包由原始开发者构建并签名，并保证对应于此源代码 tarball。
新版本 1.6.6
Saving an app's radar access again no longer resets when it last used your radar. If an app signed with a different key replaces an earlier one, its question now starts blank. The access screen says when Bike Radar isn't set up yet, says when an app already has access and labels the top button Save, and marks the line above the buttons for screen readers to announce. No change to any alert, to Home Assistant or to which radars work.
新版本 1.6.5
If an app asks to use your radar before you have accepted the "Before you ride" screen, you now see that screen and then its question, instead of a silent refusal. When an app you already allowed asks again, the screen says to turn both switches off to stop sharing, and its second button reads Cancel. Those buttons stay in place as you flip a switch, at any text size. No change to any alert, to Home Assistant or to which radars work.