Measurements never leave your browser
Face analysis sites normally post your selfie to a server, and their privacy policy is the only thing standing between that image and a training set. Here the landmark model is downloaded to your device and the photo stays in page memory — the measurement tools have no upload endpoint to trust, because they do not upload.
You do not have to take that on faith. Open developer tools, watch the Network tab, and run any measurement on this site: you will see the model file come down, and nothing go up. The AI features (simulations, boards, the Face Report, age and look-alike reads) are the exception, and say so: they upload the photo you choose when you start one.
How the data actually flows →