LockIn
The Most UNBLOCKABLE Desktop Site Blocker
LockIn launched on January 26, 2025 with 8 votes, #2,695 of 6,142 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
You can get around other site blockers, but with LockIn, bypassing it is virtually impossible. Just select the sites/apps you want to block, set a timer for how long to enforce the blocks, and focus on what truly matters. You'll thank us later.
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LockIn MCPJun 2026 · lockinmcp.com · ▲116I was tired of how bad distraction blockers are so I built my own. LockIn lets AI assistants (Claude, ChatGPT, Cursor, etc.) block websites by editing the system hosts file directly via MCP tools (via a secure cloudflare bridge). Why? Because chrome extensions don't work. Blocking it natively makes it unbypassable, and having your agent gatekeep your focus is the ultimate cheat code. Since everyone is using AI agents nowadays, but most people start scrolling or Reddit while waiting for Claude Code to finish, giving them control over your focus solves that. The MCP server exposes four tools:…
HNBlocker – Chrome extension that lets you block other HN users2013 · chrome.google.com · ▲38
SiteBlocker V4Jun 2026 · siteblocker.app · ▲3Block distracting sites with a focus mode you can't quit
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Source: Product Hunt launch ↗
Launched alongside, January 2025
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