Best Open-Source AI Agent Browser Extensions
As of September 2026, AlphaMoat tracks 6 AI browser extensions tagged Open-Source AI Agent. The most-installed is Pie (497 users). Ranked by install count, updated monthly.
| # | Extension | Publisher | Users | Rating |
|---|---|---|---|---|
| 1 |  AI browser agent: reads pages & PDFs, fills forms, extracts data to CSV, automates tabs. Claude, GPT, Gemini & 8 more. Open source. | pie | 497 | ★ 5.0 |
| 2 |  Side panel AI agent. BYO key (OpenAI/Anthropic/Google), no account. Element picker, MCP tools, skills. AGPL-3.0, local-first. | catcat | 332 | ★ 5.0 |
| 3 |  Custom programmable tools for every open tab. For you, or for your AI. | customaise | 65 | - |
| 4 |  Automate web tasks with AI! May is an open-source Chrome extension that lets you extract data, fill forms, and more. | - | 58 | ★ 5.0 |
| 5 |  Your autonomous browser copilot. | - | 25 | ★ 5.0 |
| 6 |  Cut through OSS noise by quickly exploring GitHub repositories. | storia | 15 | ★ 5.0 |
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FAQ
Open-Source AI Agent Chrome extensions: which ranks #1?
In September 2026, Pie (497 users) ranks #1 by users, followed by Cebian · Open-Source AI Side Panel Agent (332 users) and Customaise (65 users).
Open-Source AI Agent Chrome extensions: what are the top 6?
Ranked by users, the top 6 are: 1. Pie, 2. Cebian · Open-Source AI Side Panel Agent, 3. Customaise, 4. May This Known As AI Powered, 5. Oryonix AI, 6. GitHub Sage.
How many Open-Source AI Agent Chrome extensions does AlphaMoat track, and where does the data come from?
AlphaMoat tracks 6 Open-Source AI Agent Chrome extensions, ranked by users. User counts come from public Chrome Web Store data. Updated monthly; the current data is for September 2026.
Lists every Chrome extension carrying this tag, ranked by latest-month install count. See methodology.