Shuttlewright Mask

Shuttlewright Mask replaces sensitive values in your text with tokens in the browser, then swaps the real values back into the AI's reply. It masks things like names, emails, phone numbers, card numbers, addresses and amounts.

The free Desk tier needs no account and allows 1,000 characters per text. Pro is $9 a month for unlimited length and saved term lists, and Team is $29 a month for 5 seats. The page says this is pseudonymisation, not anonymisation, and makes no compliance guarantee.