Product.
What Jot is for, what it declines to become, and where the free/paid line falls.
The free tier is not a trial
Everything Jot does on your own machine is free and stays free. Working out which single thing to charge for was harder than deciding to charge at all.
Notes and todos are different animals
One has a deadline and wants to leave. The other has no deadline and should stay. Jot captures both through the same box, and the entire distinction is one key.
Jot is not a note app, and the refusal is the product
Every capture tool eventually grows an editor, then folders, then a graph view, and stops being usable for the thing it was built for. Here is the anti-persona, written down so it can be enforced.