Can we rebuild it?

Can we rebuild Monica: All-In-One AI Assist & Smartest AI Agent?

Build a Chrome extension like Monica: All-In-One AI Assist & Smartest AI Agent — a Monica: All-In-One AI Assist & Smartest AI Agent alternative you own.

If you want to build your own Monica: All-In-One AI Assist & Smartest AI Agent alternative, you do not need their proprietary infrastructure. A modern Chrome extension using Chrome's side panel API, content scripts, and direct connections to OpenAI or Anthropic delivers the exact same in-browser AI copilot experience.

The listing record

What Monica: All-In-One AI Assist & Smartest AI Agent does

Monica is your all-in-one AI assistant. Hit Cmd/Ctrl + M, and you're in with it. We offer assistance in various tasks including searching, reading, writing, translating, creating, and more. Key Features: Work Easily with Monica Agent Monica Agent: Your AI-powered productivity assistant that automates complex workflows and completes hours of work in minutes Browser Operator: Advanced AI automation that controls your browser to handle repetitive tasks across multiple websites seamlessly Deep Research: Professional AI research tool that delivers comprehensive reports and in-depth analysis with one click Slides Generation: Transform ideas into stunning presentations instantly. AI-powered design tools for professional slides made easy. Chat with AI Multi Chatbots: Chat with various LLM models like GPT-5.2, GPT-4o, Claude 4.5 Sonnet, Gemini 3 Pro, & more advanced models in one place.

What the store says

★ 4.9 from 32K ratings · 3M users

Pulled live from the Chrome Web Store listing at analysis time.

Can PlugThis rebuild Monica: All-In-One AI Assist & Smartest AI Agent?

What you'd plug into

Why build your own Monica: All-In-One AI Assist & Smartest AI Agent alternative

• Pay raw API costs instead of an expensive monthly markup
• Zero data logging through a middleman's proprietary proxy
• Bring your own API keys for OpenAI, Anthropic, and Gemini
• Customize exact prompt templates for page reading and writing

What it costs vs what you'd save

The starter prompt

Build an all-in-one AI assistant Chrome extension featuring a side panel and floating widget triggered by a keyboard shortcut. Allow the user to input their OpenAI or Anthropic API keys, select active models, and automatically inject the current webpage selection or full page text into prompts for quick summarizing, translation, and drafting.

Features you could add that Monica: All-In-One AI Assist & Smartest AI Agent doesn't have

Because you own the code, these are a follow-up prompt away — tap one to add it to the prompt above.

• Custom System Prompts — Add specialized quick-actions like code refactoring, tone adjustments, or structured data extraction.
  + add to prompt
• Local History Sync — Save chat logs and generated research notes directly to Supabase or your own local storage.
  + add to prompt

Questions about rebuilding Monica: All-In-One AI Assist & Smartest AI Agent

How to build it yourself

1. 1
   Open PlugThis and start a new build

   Head to PlugThis and start a new Chrome extension. You're describing a Monica: All-In-One AI Assist & Smartest AI Agent alternative you'll own outright — no store subscription.

2. 2
   Paste the starter prompt

   Paste the starter prompt above. PlugThis expands it into a full Manifest V3 extension — popup, content scripts, and service worker included.

3. 3
   Connect your own keys

   Wire in OpenAI / Anthropic APIs using your own account — the build uses your credentials, so there's no per-seat fee.

4. 4
   Review, tweak, and load it

   Review the generated code, ask for tweaks in plain English, then download and load the unpacked extension in Chrome to try it.

5. 5
   Publish it (optional)

   When you're happy, publish your Monica: All-In-One AI Assist & Smartest AI Agent alternative to the Chrome Web Store — or just keep it as a private tool for yourself.

More teardowns

We run the same teardown on any Chrome extension — what it does, whether a self-built alternative holds up, and the prompt to make one. Tear down another extension, or see the extensions we've actually rebuilt and filmed — real build times, real prompts, real recordings.