SQLens: LeetCode Helper & Study Notes

Description

LeetCode notebook: save problems, turn the code you wrote into study notes, sync to GitHub, export a revision PDF. SQLens is a LeetCode extension that turns the solutions you write into revision notes. Save the problem you are working on, write your own answer, and SQLens drafts the intuition, approach and complexity from your code, tags the problem by topic, commits it to your own GitHub repo, and exports the whole notebook as an interview-prep PDF. SQLens never solves a problem for you. There is no answer button, and there never will be — the AI only describes the code you already wrote. That is the entire point: you do the thinking, SQLens makes sure you can still remember it three weeks later. WHY PEOPLE INSTALL IT You finish a problem, you never write it up, and three weeks later you solve it again from scratch. Prep that lives in a closed tab is prep you lose. WHAT YOU GET • One-click capture — save the problem you are on with a button or Alt+Q • Study notes drafted from the code YOU wrote — intuition, approach, complexity • 5 AI write-ups free with no setup at all, no API key, no signup • Automatic topic tagging — joins, subqueries, window functions, CTEs, aggregation, plus LeetCode's own tags • Progress charts — problems solved per day, your Easy/Medium/Hard split, and the topics that fight back, scored from your wrong submissions rather than from how many problems you finished • GitHub sync, unlimited and free on every tier — each Accepted solution is committed to a repo in your own account, public or private, with your notes and a README that indexes everything by topic • Printable revision PDF of your whole notebook • Two buttons on the page, and a launcher that folds them away when you need the room • Works in any language the LeetCode editor supports FREQUENTLY ASKED Is SQLens free? Yes. The free tier gives 12 captures and 12 AI write-ups every month on any problem type, one PDF export, and GitHub sync with no cap at all. Pro removes the limits for $2.50/month or $12/year, in your local currency. Does SQLens solve problems for me? No. It has no solution generator. It writes up the solution you wrote — and if the editor is empty, it says so. Do I need an API key? No. Your first 5 write-ups run with zero setup. After that you paste a free Groq API key, which is stored on your machine and sent only to Groq. Does it work for LeetCode SQL 50? Yes — that is what it was built for. Every query is tagged by what it uses, so your SQL practice notes show you your own patterns across the list. Does it work for DSA and algorithm problems too? Yes. Captures, notes, tagging, GitHub sync and PDF export work on every LeetCode problem, in any language. Does it save solutions to GitHub automatically? Only after you connect GitHub and choose a repo. Then every submission LeetCode marks Accepted is committed with your notes. Nothing is pushed before you connect it. Is it cheating? Does it touch my LeetCode account? No. SQLens never submits, posts, or changes anything on LeetCode, and it never writes an answer for you. It reads the problem title and the code you typed, only when you press a button. What about privacy? Nothing is captured automatically — every save is a button press. Your notebook, notes, code and counters stay in local browser storage. Data leaves your device in exactly three user-initiated cases: a study-note generation (the problem title and your own code go to Groq — the problem statement is never sent), restoring a purchase (your email), and GitHub sync (to your own repo). No analytics, no tracking, no telemetry. Premium problems are never captured, and exports contain your own work plus a link to the problem, never the problem text. GOOD FOR SQL interview preparation • data analyst and data engineer interviews • LeetCode SQL 50 and database problems • DSA and coding interview prep • building a public solutions repo on GitHub • revision before an onsite SQLens is an independent study tool. It is not affiliated with, endorsed by, or sponsored by LeetCode.

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