Sentinel

About

Sentinel is a privacy-first browser extension that helps users stay aware of on-screen content by locally analyzing visible page text and applying user-controlled rules to warn, blur, or block content.

All processing happens entirely on your device. Sentinel does not collect personal data, does not track browsing activity, and does not send page content to external servers.

Privacy by design

Sentinel is built to be transparent and user-controlled.

No data collection
No analytics or tracking
No remote servers
No browsing history stored
No page content transmitted or saved
AI moderation is inactive in this version and makes no network requests
Any API keys entered are stored locally only and are not used

Key features

Local, on-device content awareness
Warn, blur, or block modes
Guardian Lock (PIN protection) for settings
Per-site rules and presets
Cooldown timers and friction for bypass actions
Privacy-safe debug tools that never copy page text

How it works

Sentinel scans visible page text only and applies rules you control. It does not monitor keystrokes, form inputs, background activity, or network traffic. Sentinel operates only when enabled.

Because detection is rule-based and local, false positives or negatives are possible.

Important notes

Sentinel is intended for personal awareness and self-regulation, not surveillance.
The extension can be disabled or removed by the user.
Some iframe or dynamically loaded content may not be detectable.

A public privacy policy is available via the link provided in this listing.

Sentinel is ideal for users who want a lightweight, transparent, and privacy-respecting way to stay aware of on-screen content without sacrificing control.