The App Store for AI Browser Extensions

Customize your browser. Automate the busywork.

ExtensionOS gives power users and teams a premium marketplace of AI extensions that summarize, autofill, organize, research, reply, focus, and personalize the web.

Works in Chrome, Edge, Brave, Opera & FirefoxLocal-first & privateAI semantic search
extensionos.app/marketplace

Smart browser stack

Research sprint
Running
Inbox cleanup
Queued
CRM update
Queued

Marketplace automation feed

AI Tab Organizer

Grouped 42 tabs into 5 workspaces

Live

AI Autofill Assistant

Completed vendor intake fields

Ready

AI Web Summarizer

Prepared a cited page brief

Done

AI actions

18.4k

saved this month

Policy score

99%

approved automations

Featured · FindThat

Never lose a page again.

Search your browsing memory by what you remember — “the 3D printing LED lamp guide I saw yesterday” — across every browser, with AI semantic search on Pro.

Download FindThat
Re-find pages instantly
Cross-browser & local-first
AI semantic search (Pro)
Platform

Everything a premium browser layer needs

From quiet on-device capture to enterprise-grade sync, search, and billing — built to feel effortless.

Search what you remember

Natural-language recall finds the page by what it was about — not the exact title or URL you forgot.

Private by default

The free tier runs entirely on-device. Sensitive pages are skipped, and nothing leaves your browser.

Effortless capture

Pages are indexed quietly as you browse — no tagging, no folders, no busywork to maintain.

Built to scale

Account sync, AI search, billing, and admin controls ready for individuals and enterprise teams.

Before / after

From tab pileup to a productivity layer.

Replace repetitive clicks, context switching, and page skimming with AI workflows that run where work already happens.

Before

44 unmanaged tabsManual CRM fieldsReading every pageCopy-paste replies

After

5 smart workspacesApproved autofillCited summariesContextual drafts
FAQ

Questions before you install?

Everything you need to know about privacy, browsers, and billing.

The free experience is fully local — page memory stays on your device and sensitive pages are skipped automatically. Pro features that use the cloud are opt-in and clearly explained.

Build the browser stack your best work deserves.

Start with FindThat free, then scale into a full browser operating system.

Get started free