Airtable is built as a database with a spreadsheet-like face. To use it you create a base and put your records in it; from then on the base is where your data lives, and everything else — views, forms, automations, interfaces — is built on top of that. That is a sound design for what it is, and it is the opposite of this one.
Gsheet CRM does not have a base. It connects to one Google Sheet in your Drive and reads and writes that file. The board is your status column drawn as stages; a card is a row; dragging it changes the cell. Our servers keep the wiring — which columns mean what, who is on the team, when follow-ups are due — and hold your leads only in a short-lived, encrypted cache that expires within ten minutes. There is no copy of your customer list anywhere but your spreadsheet.
Every consequence on this page follows from that single difference: sharing, backups, formulas, and what happens the day you leave.