A whiteboard built for tutors. Open a PDF, work the problem by hand beside your student, and keep every board you drew on.
That is a real board, running in this page. No sign-up, no video.
Drop in a problem set and step through it a page at a time, annotating straight onto it. Photos and screenshots work the same way.
Every pen, every colour, every tool, on the free account. Paying saves your work. It does not unlock the whiteboard.
Each wipe quietly saves what was there, filed under the student and the date. That is the session record, without anyone writing one.
Maths tools behind one button so a reading tutor never sees them. Graph paper on a keypress. Light, dark and chalkboard. A board that never makes you wait.
The whiteboard is free. You pay to keep what you drew on it.
Most tools in this category give you a crippled board and charge you to make it work. That is backwards. A tutor in front of a student needs every tool to be there, and a lesson is a bad moment to discover that the highlighter is a paid feature. So the board is complete for everybody, and what costs money is storage and the things a business needs: saved sessions, a student roster, a shared Content Pack library, your own branding.