Apps similar to Mask This include Velum Privacy, which has a free version. Other options are MaskPaste and SafePaste AI. In total there are three Privacy Tools like Mask This for Mac and Linux.
Masks personal data in text and files before it reaches ChatGPT, Claude or any AI, then restores it in the reply, running entirely on your own device.
Spain
EU
MaskPaste lets you mask sensitive details on your device, without sending or saving your text or replacement rules to any external server, before you paste into AI.
Automatically mask sensitive data (API keys, PII) locally before pasting into AI chatbots like ChatGPT and Gemini.
Thailand
