SirenGPX: Speed Video Overlay

Turn your ride videos into pro-looking clips. SirenGPX overlays your real workout data — speed, heart rate, elevation, distance — right onto the footage, all on your iPhone. HOW IT WORKS 1. Record a workout with your Apple Watch (or any app that saves workouts to Apple Health). 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. WIDGETS & SCENES - Bike computer: speed, distance, time - Heart rate - Elevation and route profile - Speed graph - Mini map Customize the colors and show only the widgets you need. Choose from 8 speedometer styles, from minimal to neon. PRIVATE BY DEFAULT Everything renders on your iPhone. Your video and health data never leave the phone — no accounts, no cloud, no uploads. FREE FOREVER, PRO IF YOU WANT IT SirenGPX is free: every feature is available, with a small watermark on the video. Remove it for a single video by watching a short ad, or unlock SirenGPX Pro to remove the watermark forever — a one-time purchase, no subscription. Works great for cycling, running, and any other workout tracked with Apple Watch and Apple Health. Compatible with footage from GoPro, DJI, Insta360 and any action camera.