SirenGPX

Overlay your Strava speed and metrics onto your ride videos — rendered right on your phone.

Coming soon to Google Play Privacy Policy →
What it does

Turn ride data into video

🔗

Strava sync

Sign in with Strava and the app automatically matches the right ride to your video by timestamp.

📱

On-device rendering

FFmpeg burns the overlay into your video locally. Your footage never leaves your phone.

⚡

8 speedometer styles

From minimal to bold, pick a speedometer that fits your edit — fully positioned where you want it.

📊

Rich metrics & scenes

Heart rate, altitude, distance, gradient, cadence, power — plus composite, elevation and map scenes.

SPEED HR ALT DIST GRD CAD PWR
How it works

Four steps to a finished clip

1

Connect Strava

Secure OAuth sign-in. Tokens stay in the device keystore.

2

Pick a video

Choose a clip from your gallery — the matching ride is found for you.

3

Customize the overlay

Choose the speedometer, metrics, scenes and position.

4

Render & save

FFmpeg renders on-device and saves straight to your gallery.

Your data stays yours

No accounts, no servers, no uploads. Strava tokens and your videos never leave the device. Read the full Privacy Policy.