36 physics simulators that produce measurements, not animations. Every reading comes through an instrument with a real resolution limit and real noise, and every uncertainty propagates through to the graph. Drop one into your platform and your learners get data to analyse instead of a diagram to watch.
Each includes 25,000 monthly active learners. Above that it is 55p each, falling to 22p, and capped at two and a half times your base — so a good year never produces a bad invoice.
The report editor, the citation styles, the graphing calculator and The Classroom stay here — they are what the direct product is for. The experiment-design flow, the choice of instrument and full uncertainty propagation are available on request, on the licence for high-stakes assessment. Everything else is one instrument per quantity, with its real resolution, and the readings it gives.
Have a look at what there is first, then say which ones and roughly how many learners, and we will send a licence back rather than a discovery call.