Focus Shield

Overview

Focus Shield is an enterprise-grade Chrome extension designed for developers, researchers, and remote professionals. It combines powerful domain blocking with an integrated Pomodoro timer to help you achieve flow state effortlessly. Featuring offline cryptographic license verification and zero data tracking.

Key Features & Architecture

• ✓
  WebCrypto SHA-256 Offline Cryptographic License
• ✓
  Integrated 25-Minute Pomodoro & Custom Work Sessions
• ✓
  Instant URL Pattern & Subdomain Blocking
• ✓
  Zero Cloud Tracking – 100% Local Privacy Protection
• ✓
  One-Click Lifetime Upgrade via Official PayPal

Who Is This For

Deep Work Developers

Block Hacker News, Reddit, and YouTube during Pomodoro sessions while keeping documentation sites whitelisted.

Remote Professionals

Block social media and news sites during work sessions while whitelists keep Slack, email, and docs always reachable.

Students & Researchers

Focus through 25-minute sessions with custom blocklists tuned for social media.

Frequently Asked Questions

Does Focus Shield work offline?

Yes. License verification runs locally in your browser via WebCrypto SHA-256 — no server round-trip is ever required.

Which browsers are supported?

Chrome 88+ and Chromium-based browsers (Edge, Brave, Arc). Firefox support is on the roadmap.

Will it slow down my browser?

No. Blocking uses declarative URL patterns evaluated natively by Chrome — there is no per-request JavaScript overhead.

Is Focus Shield free?

Yes. Core site blocking and the built-in Pomodoro timer are free forever. A one-time $9.99 Pro upgrade unlocks advanced layouts, custom audio alarms, and infinite blocking lists.

What data does Focus Shield collect?

None. Zero telemetry, zero analytics, no cloud sync — 100% local.

How It Compares

Feature	Focus Shield	StayFocusd / LeechBlock
Offline license verification	✓ Built-in WebCrypto	N/A (free OSS) / N/A (free OSS)
Pomodoro timer included	✓ Integrated	✗ None / ✗ None
Zero telemetry	✓ 100% local	✓ Open source / ✓ Open source
One-time pricing	✓ $9.99 lifetime	✓ Free (OSS) / ✓ Free (OSS)