Lab Report

LockIn MCP

Turn ChatGPT, Claude, Perplexity, and Gemini into your productivity coach.

The Verdict

LockIn MCP is a smart fit if you already live inside an AI agent and want your focus tooling to live there too. Instead of a browser extension you toggle by hand, you tell Claude or ChatGPT to block Twitter for the next 90 minutes and it enforces that at the system level. At $2.99 a month or $59.99 for life, it is cheap enough that the real question is not price but whether you actually run agentic workflows day to day. If you do, this is worth a trial; if you do not, a standard blocker will serve you better.

Pricing

A 3-day free trial covers the monthly plan. There is no permanent free tier, so plan on paying if it sticks.

Monthly

$2.99/month

3-day free trial
System-level domain blocking
One-line installer + MCP server
Works with Poke, Claude, ChatGPT & more
Stable relay URL for remote MCP
Recommended Poke focus recipe
Cancel anytime, keep your focus

Lifetime

$59.99 once

System-level domain blocking
One-line installer + MCP server
Works with Poke, Claude, ChatGPT & more
Stable relay URL for remote MCP
Recommended Poke focus recipe
Lifetime license, pay once

The math is simple: the lifetime license pays for itself after roughly 20 months. If you expect to use this past a year and a half, buy once and forget it.

Key Features

block

System-level domain blocking

Blocks sites at the hosts-file level, not just in one browser tab, so incognito windows and other browsers get caught too.

smart_toy

AI enforces focus

You describe a task to your agent and it manages the block list to match, tying enforcement to what you are actually working on.

hub

Multi-tool support

Works across Poke, Claude, ChatGPT, Perplexity, and Gemini rather than locking you into a single assistant.

terminal

One-command install

A single-line installer sets up the MCP server, which keeps setup friction low for anyone comfortable in a terminal.

lock_open

Accountable temp-unblock

Need a site back? You can temporarily unblock with an accountability step, so escape is possible but never frictionless.

dns

Stable relay URL

A persistent relay URL lets remote MCP clients connect reliably, which matters if your agent runs in the cloud.

Who Should Use It

Remote workers who spend their day directing an AI agent get the biggest payoff. Blocking becomes a natural part of the same conversation where you plan and execute work, so there is no separate app to remember.

Students juggling research and writing can use the temp-unblock accountability layer to keep social sites off limits during study blocks without total lockout.

Developers and power users already comfortable with MCP servers and one-line installers will feel at home. This tool assumes you know your way around a terminal and an agent config.

Limitations

Requires hosts-file access. System-level blocking means it edits your hosts file, which needs elevated permissions and may clash with locked-down work machines or corporate policies.
It does not block everything. Native apps, phones, and DNS-over-HTTPS setups can slip past hosts-based blocking. This is a focus aid, not an airtight cage.
Tied to supported AI tools. The value depends on you running Poke, Claude, ChatGPT, Perplexity, or Gemini. If you do not use an agent, this is a clunkier path than a plain blocker.
No permanent free tier. The free option is a 3-day trial only, so treat it as a paid tool from the start.

Try It

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