SQLens: LeetCode Helper & Study Notes

LeetCode notebook for SQL & DSA: turn your solutions into study notes, tag topics, export a revision PDF for interview prep.

SQLens is a LeetCode extension for SQL interview preparation and DSA practice. It fixes the step everyone skips: you finish a problem, never write it up, and three weeks later you cannot remember how you solved it. SQLens turns the solution you wrote into study notes, tags each problem by topic, and exports your notebook as a revision PDF. Most prep disappears the moment you close the tab. You solve a window-function problem, you feel good about it, and three weeks later you solve it again from scratch. SQLens fixes that by keeping a notebook of your own work. WHAT IT DOES • Save a problem you are working on with one click, or Alt+Q • Generate study notes from the code YOU wrote — intuition, approach, complexity • Works on any LeetCode problem, in any language the editor supports • Built for SQL practice: whether you are working through LeetCode SQL 50 or preparing for a data analyst interview, every query is tagged by what it uses — joins and subqueries, window functions, CTEs, aggregation — so your SQL practice notes show you your own patterns • Sync to GitHub: every solution LeetCode marks Accepted is committed to a repo in your own account — public or private, your choice — together with your notes, and the README indexes everything by topic with your solved stats. Free on every tier, and nothing is pushed until you connect it • Export everything as a printable revision PDF • Optional AI solutions, gated behind a thinking timer you set yourself — once you lock it in, it cannot be shortened, paused, or cancelled WHAT IT DOES NOT DO • Nothing is captured automatically — every save is a button press • Nothing is ever posted or submitted to LeetCode on your behalf. The only thing it publishes is to your own GitHub repo, and only once you connect it • Premium problems are never captured • Exports contain your own work and a link back to the problem, never the problem text itself AI FEATURES ARE OPTIONAL The notebook works without any AI. To use the writing assistant you supply your own free Groq API key, stored locally on your machine. On the free tier AI solutions are limited to SQL problems; Pro covers every problem type. FREE AND PRO Free covers 2 captures a week, one PDF export a week, 2 AI write-ups a month, and 2 AI solutions in total. GitHub sync is free on every tier. Pro removes the limits at $2.50/month or $12/year. SQLens is an independent study tool. It is not affiliated with, endorsed by, or sponsored by LeetCode.