SirenGPX: Speed Video Overlay

Burn real speed, heart rate and elevation onto your ride videos — from Apple Health or a GPX file, all rendered on your iPhone. Free, no subscription, no account.

SirenGPX burns your workout data onto the video — speed, heart rate, altitude and more. All on your iPhone.

HOW IT WORKS

1. Record a ride or run and save it to Apple Health — with an Apple Watch or any fitness app — or import a GPX file from any GPS tracker or bike computer.
2. Shoot a video on your iPhone or an action camera.
3. Pick the workout and the video in SirenGPX — it syncs them by time and renders the overlay.

13 FULL-SCREEN THEMES From minimal to neon: Cyber Rider, Pixel Racer, Grand Tour, VHS Tape, Night Strip, Superlight, Morning Coffee, Daylight, Vice, Fighter HUD, Aurelia, APEX and Meridian — pick a ready-made look for the mood of your ride, or build your own set of widgets.

DATA WIDGETS

• Bike computer: speed, distance, time
• Heart rate, altitude and elevation profile
• Speed graph
• Route mini-map
• Grade, cadence and power (Pro) Customize the colors and show only the widgets you need.

PRIVATE BY DEFAULT Everything renders on your iPhone. Your video and health data never leave the phone — no accounts, no cloud, no uploads.

FREE, PRO IF YOU WANT IT Free: 5 speedometer styles, the core metrics (heart rate, altitude, distance, temperature, calories) and almost all themes — with a watermark on the video. SirenGPX Pro removes the watermark for good and unlocks the remaining speedometer styles, metrics and the Pixel Racer theme — a one-time purchase, no subscription.

Great for cycling, running and other GPS workouts — from Apple Health or a GPX file. Works with any video in your iPhone Photos: the native camera, GoPro, DJI, Insta360 or another action camera (after exporting to Photos).