Miscellany
Opens your Excel workbook, lets you work in it, and gives it back without wrecking it. Change one cell in a file full of pivot tables and macros we cannot even display, and every part we did not touch comes back byte-for-byte.
One file. Double-click it and Sheet runs — no install, no server, no account. That same file is the source: open it in any text editor, or attach it to ChatGPT or Claude and ask “does this send my data anywhere?” What you check is what runs, because there is only the one file. It contains no networking code at all.
Slides whose numbers and charts are bound to cells. Edit the sheet and the bar grows, the axis rescales, the percentage recomputes — with no synchronisation code, because a slide object and a cell are the same kind of thing.
One file. Double-click it and Deck runs — no install, no server, no account. That same file is the source: open it in any text editor, or attach it to ChatGPT or Claude and ask “does this send my data anywhere?” What you check is what runs, because there is only the one file. It contains no networking code at all.