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Every simulator, every instrument and every uncertainty is free, for as long as you like — and your data is yours to export whatever you pay. The paid plans are for the write-up: the page guides, the citations, the exports, and figures that update when your data does. Newtron is free for your first 2 months.
Nothing is charged yet — there is no payment set up, so any plan is yours for the asking while PhysLab is being built. These are the prices it will have.
Measure the physics yourself, as long as you like.
Write it up, properly.
The whole lab, with nothing held back.
A grown-up needs to pay for this one. Send them the link and they can set it up in a minute — or ask your school, because a class licence covers everyone. Either way your plan runs until 31 July, whenever you start it, so it ends with the school year rather than on the day you happened to buy it.
Buying for a class? School plans are here. Building courseware of your own? Licensing is here.
If a plan ends, every experiment, graph and write-up stays exactly where it is. You can still open them, read them, print them and export the lot to a file. What a plan changes is what you can make next — never what you have already made.