Small, free, browser only. Nothing you paste is uploaded anywhere.
Strip names, emails, phone numbers and card numbers out of a spreadsheet before you share it.
Check a message before you send it to ChatGPT or Claude. It marks the things you probably should not share, like a Social Security number, a card number or an email address, and says why in plain words.
Paste a log, a stack trace or an .env fragment and see the secrets hiding in it: API keys, tokens, JWTs, private keys, and personal data. You get back a scrubbed version that is safe to paste into an AI chat.
Paste a prompt, a scraped web page or an untrusted tool output and see any hidden instructions, invisible characters or lookalike letters hiding inside it, decoded into readable text, before you hand that text to an AI agent.
Paste your two spreadsheet columns and find out exactly why each row will not match: an invisible space, a number stored as text, a different letter case, or a typo. It names the reason in plain words, shows you the text that would match, and writes the VLOOKUP or XLOOKUP formula for you in both Excel and Google Sheets.
Enter a chart's axis range and the two values it plotted, and see how much bigger the difference looks than it really is. It redraws the same numbers on an honest axis that starts at zero, side by side with the original, and says in plain words how many times more dramatic the chart is than the truth. A gallery of real finance tricks is built in.
Paste a column of numbers and find out whether the average is telling you the truth. It shows the mean and the median side by side, places every number on one line so you can see which one sits with the crowd, names the values dragging the average away, and tells you in plain words which number to report.
See what INNER, LEFT, RIGHT and FULL JOIN actually do, on real rows instead of a Venn diagram. Two small tables with a customer who never ordered and an order with no customer, so every join type gives a different result. Pick a mode and watch which rows survive and exactly where NULL appears, with the matching SQL underneath. Nothing to type in.
Paste the colors from your chart or dashboard and see which pairs disappear for someone who is colorblind, which is about 1 in 12 men. It shows your palette through each of the three kinds of colour blindness, names the exact pairs that collapse, and hands you a safe replacement palette ready to paste into Power BI or Tableau.
Your first week at a small tutoring company, except the company is made up and the database is real. A manager sends you five plain-English business questions and you answer each one by writing actual SQL, which runs against a real SQLite database inside this page. The data is deliberately messy in the ways real data is. Every question has a hint and a worked answer, and once you get it right you are shown what your query did and what to tell your manager. The database engine ships with the page, so this works with no connection at all and nothing you type ever leaves your machine.
Your dashboard says one number and finance says another. Answer four quick questions and this ranks the known reasons two numbers disagree, most likely first, hands you the SQL to prove or rule out each one, and writes the report to send back to whoever asked. Timezones, late-arriving rows, different filters, double counting from a join: the causes are the same every time, and this is the checklist.
A demo. Pick one of six plain-English bookkeeping questions and watch it become SQL, run against a fictional design studio in your browser, and explain exactly how the number was worked out. There is nothing to upload and no account.
Turn a LinkedIn connections export into a searchable, segmented view of your network. Runs entirely in the browser, with no account and no database.
A bag of small tools for getting unstuck: first step splitter, focus sprint, brain dump, grounding, and more. Saves only to your own browser.