1. Okane Budgeting Operator-affiliated
Mobile envelope budgeting app whose backing store is a Google Sheet on the user's own Drive. Free tier with unlimited envelopes; $5/month Premium adds Plaid bank sync and on-device AI categorization.
Why it's on this list: The Google Sheet is the source of truth — Okane reads and writes the same sheet that lives on the user's Drive. No copy on Okane's servers. Operator-affiliated.