Last updated: 10 August 2026
InForm Motion Analysis is a video app for dance and sports. It films, slows down, annotates, measures and compares movement. This page is how to get help with it.
Email: tangotoolkit@gmail.com
Questions, bug reports, and requests all go to the same address, and a person reads them. Expect a reply within a few days.
Three things make a problem far quicker to fix, so please include them if you can:
Open the video, set the loop markers around the part that matters, then use the + menu and choose Share…. InForm cuts that section, burns your drawings into the picture so they survive the trip, and hands it to your phone's normal share sheet — messages, email, anywhere you already send video. Nothing is uploaded by InForm itself.
No, and there is no save button for them on purpose. Drawings, measurements and notes are written to your device automatically, within about half a second of each change, in a file that sits beside the video.
That is deliberate: a video opens with a clean picture every time, so you are never drawing on top of last week's marks. To keep a marked-up version, save it while the drawings are on screen — either Save in the top bar, or file it into a project — and tick burn into the video. That writes a new video with the drawings permanently in the picture.
Tap Compare on the opening screen, or the compare button in the top bar, and open a video into each half. The play and step buttons in the shared bar at the bottom drive both videos together; the buttons on a video itself drive just that one. "Match loop lengths" and "match loop speeds" line up two takes of different speeds.
Choose the angle tool from the tool menu and place three points — tap or drag,
either works. The angle is drawn and labelled on the frame. With the shape
selected you can log it, which appends a line like 132° @ 0:04.3 to
that clip's notes, so a session leaves a list of measurements behind.
Use YouTube on the opening screen and paste a link. On Android you can also use the Share button inside the YouTube app and pick InForm. YouTube clips play through YouTube's own player inside InForm, so they can be slowed, looped, drawn on and compared against your own footage — but they cannot be saved or exported, which is YouTube's rule rather than ours.
Video is large, and InForm keeps its own copy of anything you open so your drawings have something stable to attach to. On the opening screen, Free Space shows how much is held and clears it by age or by kind, and Auto-clean sets a standing rule — delete raw videos older than a month, say. Auto-clean is off unless you turn it on, and both tell you exactly what will go before anything goes.
A single clip or photo goes out through the share sheet. A whole project goes out from the projects hub with ⋮ → Back up, which zips the folder — videos, images, drawings and notes together — to wherever you want to put it. Unzipping that folder back into the projects folder restores it.
Please do not uninstall to fix a problem. Everything you film, save and annotate lives inside the app, and uninstalling deletes all of it — projects, recordings and the video library alike. Installing an update over the top is safe; uninstalling is not. Back up anything that matters first, and email before you resort to it.
InForm writes its own error log, which usually explains a crash far better than a description can. On Android it is at:
Android/data/dev.sericson.inform/files/InForm/errors.log
Reach it with your phone's Files app, or by plugging the phone into a computer. Attaching that file to an email is the single most useful thing you can do for a bug that is hard to describe. It holds error messages only — no video, and nothing about you.
A camera and a microphone are optional — InForm works on video you already have without either.
InForm has no accounts, no sign-in, no analytics and no advertising, and your videos stay on your device. The full policy is at InForm — Privacy Policy.
Feature requests are genuinely welcome and several are already in the app because someone asked. Send them to the same address.