Change the letter case of the cells you selected — UPPERCASE, lowercase, Title Case, Sentence case — free, and fast enough for thousands of cells at once. Pro adds editorial Title Case, camelCase, snake_case and more.
One permission, nothing else. It only ever touches the cells you selected in the spreadsheet you have open — never numbers, dates or formulas — runs entirely
inside Google Apps Script, and sends nothing from your spreadsheet anywhere — no database, no analytics. If you have a Pro licence, the add-on asks our licence server (goingstellar.ro) once a day whether that key is still active — that request carries the licence key and a random identifier for the installation, and nothing from your file. Without a licence key it makes no network request at all.