Frequently asked questions

Vi.S.In is a browser-based tool that measures joint angles from photos and video. A 26-keypoint pose model detects the body — feet included — in each frame and computes 22 joint-angle pairs, so you can quantify posture and technique instead of guessing — useful for training, form checks, and tracking range of motion.

No. Photo and live-webcam analysis need no sign-up, and a short uploaded video can be previewed before you create an account. A free account gives you a longer video preview, saved analyses, progress, and share links.

One person, clearly visible, well-lit, with no limbs cut off at the edge of the frame, and standing out from the background. For a precise still, record video first and screenshot the exact frame you want.

Pose detection runs entirely in your browser. Photos stay on your device. Uploaded video is briefly sent over an encrypted connection to extract frames, then discarded; saving stores computed keypoints and summary stats, not your original media. See our Privacy Policy.

Yes. You can delete any saved analysis from your Library at any time, and you can delete your entire account — including all saved analyses, presets, and share links — from your account page.

The full analysis tool is free. Pro adds full-length video (free analyzes the first ~15 seconds), unlimited saved analyses (free keeps 5), and watermark-free image exports. See the pricing page for the full comparison.

Pro is $6/month or $39/year. Billing is handled securely by Stripe, and you can cancel anytime from your account — you keep Pro through the end of the period you've paid for.

Open your account page and choose Manage subscription to update your card or cancel through Stripe's secure portal.

Angles are computed from a pose-estimation model, so accuracy depends on video quality, lighting, and how clearly the person is framed. You can fine-tune results by editing keypoints and smoothing the pose. Results are for informational and training purposes and are not medical advice.

Yes — use Compare in the analyzer to line up two photos or videos (before vs. after, you vs. a reference) on one timeline. Comparison is free.

Before signup, the video preview covers roughly 6 seconds. A free account covers the first ~15 seconds, and Pro analyzes longer clips up to the processing safety limit.