I built a Chrome extension that auto-hides emails & credit cards in screen demos

Geven Zhang — Wed, 22 Jul 2026 01:59:38 +0000

I record product demos on our real admin dashboard, and I kept manually blurring customer emails and card numbers every single time — worse, they'd reappear the moment the page navigated.

So I built DemoBlur, a Chrome extension that:

auto-detects emails & credit-card numbers and masks them
lets you click any element to redact it
keeps redactions persistent across page navigation / SPA re-renders (this was the hard part)
has a "demo mode" master switch

It's early. Before I polish it further, I want to know if this is a real problem for anyone else. If you'd use it, drop your email (30 sec): grab early access here — I'll send it over.

Honest question: would you pay a one-time ~$20 for this, or is it a "nice, but only if free" thing? Your answer decides whether I keep building.

DEV Community: Geven Zhang

I built a Chrome extension that auto-hides emails & credit cards in screen demos