Only when you enable an optional feature, and only the data that feature needs. If you use the AI tools, the photo or quote text you are working on is sent to OpenAI. If you take an online deposit, payment details are exchanged with Stripe. If you enable maps, the address you type is sent to Google. Licensing and updates are handled by Freemius. With none of those keys entered, PaintOps runs entirely on your own site.