All the data this app needs to know about you lives only on your device, encrypted. Nothing about you is stored, logged, or accumulated anywhere else.
It's inspired by the Zen concept of śūnyatā: the self has no fixed, independent core. And experiencing ourselves is a kind of emptying and opening.
One Line For Your Mind reflects that in its structure. Most web servers try to know who you are, collecting every data point, building profiles. But here, the goal is helping you know yourself.
The self others see when they look at you is a stranger to the one looking out. We all carry versions of ourselves we'll never meet, seen only by the people around us. And yet, they each see only a glimpse.
The technology here is congruent with that idea. There are no cookies. Your browser issues a cryptographic seed — for a tree you hold in your browser, with branches that sprout and wither with each step you take. The server sees this transiently, on each request, and each time, it forgets.
This isn't guarenteed just by a promise or policy, it is written in the code itself, for anyone to verify. You can read the full technical design here and review the code here.
Even on your device, control over your data belongs entirely to you. If you want to erase your session and begin again, you can do that right now.
Or, you can return to the present.