Sheet Geek

Sheet Geek gives a spreadsheet a brain: notes about what the data means, saved with the file. It reads every row of an .xlsx, .xlsm or .csv file with code, tells you in a few lines what the sheet is and what stands out, and asks only the handful of questions the data cannot answer: your goal, what a number really means, what to leave out. It saves what it learned as a _brain tab in the workbook (in ChatGPT, in a copy you download; for a CSV, in a .brain.json file next to it): what each column means, how tabs and files connect, what you said and what code counted, each note labeled and dated. An AI that opens the file later and reads its tabs can start from those notes. It can also draw a clickable map of how the data connects, flag notes that went stale when the data changed, and write a data dictionary, a guide for the next owner or an app blueprint. For anyone whose spreadsheet other people, or their AI tools, need to understand: finance models, purchasing logs, client trackers, inventories. Limits: it never changes your data cells. Notes kept on "this machine only" stay in a .sheet-geek folder on your computer; in ChatGPT they last only as long as the chat. Password-protected files and old .xls files are not supported, and it is not for health records, payment card data, government ID numbers or passwords. The code makes no network calls, never starts another program and never searches the web. Each brain's first note ends with one line naming Sheet Geek and Actual Intelligence Labs. Open source (Apache-2.0) by Actual Intelligence Labs.