Sprout · Chrome extension

Privacy Policy

Effective 27 May 2026

Sprout is a free Chrome extension by Prisma Labs that lets you block distracting websites by hostname. This page explains exactly what data the extension touches — and, more importantly, what it does not.

What Sprout stores

Sprout stores one piece of data: the list of hostnames you have chosen to block. This list lives in Chrome’s chrome.storage.sync area, which means:

• It is saved on your device.
• If you have Chrome Sync enabled, Chrome may copy it to other devices where you are signed in to the same Chrome profile. That copy happens through Google’s infrastructure, not ours.
• Prisma Labs never sees this list. It is not sent to any Prisma Labs server, because no Prisma Labs server is involved.

What Sprout does not collect

Sprout does not collect, transmit, sell, or transfer any of the following:

• Personally identifiable information
• Health, financial, or authentication information
• Personal communications or contacts
• Location data
• Your browsing history
• Click, scroll, or other interaction events
• The content of any page you visit
• Analytics, telemetry, or error reports of any kind

Sprout makes no network requests to any external server. You can verify this yourself by inspecting the source code — see Open source below.

Why Sprout requests the permissions it does

Chrome shows you a permissions prompt at install time. Each permission has a single, narrow purpose:

storage

Save your blocklist locally and let Chrome Sync replicate it across your devices.

contextMenus

Add the “Block this site” entry to Chrome’s right-click menu.

tabs

Read the URL of the active tab when you click “Block this site,” so Sprout knows which host to add to your list.

webNavigation

Notice when a tab is navigating to a host on your blocklist, so the tab can be redirected to the in-extension block page before the page loads.

host_permissions: <all_urls>

Required because a site blocker has to be able to evaluate every navigation regardless of which site you are visiting. Sprout reads the URL of the navigation; it does not read the page content.

Open source

Sprout’s complete source code is published at github.com/Prisma-Labs-Dev/chrome-site-blocker. You can audit exactly what runs in your browser.

Children

Sprout is not directed at children under 13. Sprout collects no personal data from anyone, child or adult.

Changes to this policy

If we update this policy we will change the effective date at the top of this page. Material changes will also be noted in the extension’s Chrome Web Store listing.

Contact

Questions about this policy: contact@prismalabs.dev.