Studykaki ((link)) -

They rolled back the AI tutor to a "last resort" button. They removed seed farming by capping daily reputation gains. They introduced a "slow lane" for the whiteboard—answers took at least one hour to appear, forcing users to think before typing.

One night, a new user posted a question on the fluid mechanics board. It was 2:00 AM. The problem was a vicious Laplace transform. studykaki

Revenue became a problem. Without VC money, they introduced a "Patron Pass"—a voluntary subscription for users who could afford it, which unlocked cosmetic tree skins and nothing else. To everyone’s surprise, 12% of users signed up within the first month. They weren’t paying for features. They were paying to keep the lights on. Today, StudyKaki is not a unicorn. It is not a household name. It has 2.3 million users—modest growth by tech standards—but an extraordinary retention rate: 78% of users who join stay for more than a year. They rolled back the AI tutor to a "last resort" button

That was the seed. Lin Wei was not a coder by training—he was a mechanical engineering major—but he knew enough Python to scrape data and build a basic web interface. He called his creation StudyKaki (a play on study buddy and the Indonesian word kaki , meaning "foot," as in "on foot"—a journey taken together). One night, a new user posted a question

Lin Wei cried a little. Not from the answer, but from the absence of cruelty. No one mocked the question. No one demanded a "proof of effort." It was just help, given freely.