Runs locally — your emails never leave your device

Find any email in seconds

AI-powered search for Outlook — faster and smarter than native search.

Inbox Search builds a local fingerprint index of your mailbox using on-device AI, so you get instant, accurate results without anything leaving your computer.

Coming Soon Free Outlook add-in
Inbox Search ×
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Inbox Search is a free Outlook add-in that replaces Outlook's slow, keyword-only search with fast, AI-powered hybrid search. It builds a local fingerprint index of every email in your primary mailbox using semantic embeddings and TF-IDF keyword analysis, so you can find messages by meaning — not just exact words. Search "budget discussion from last quarter" and get results even if none of your emails contain that exact phrase.

Everything runs on your device using a lightweight AI model via Transformers.js and WebAssembly. No email content is ever sent to a server. The index is stored in your browser's local storage, stays up to date automatically, and is deleted when you uninstall. Inbox Search works with Outlook on the web, new Outlook for Windows, and classic Outlook for Windows and Mac.

Search that actually works

Outlook's built-in search is slow and misses what you're looking for. Inbox Search fixes that.

🔍

Semantic + keyword search

Combines AI embeddings with TF-IDF keyword matching. Find emails by meaning, not just exact words.

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Instant results

Search 10,000 emails in under 500ms. Results appear as you type, ranked by relevance.

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100% private

The AI model runs entirely on your device. No email content is ever sent to external servers.

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Local index

Builds a fingerprint index of your mailbox stored in your browser. Always up to date, always local.

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Zero configuration

Install it, let it index, and search. No setup, no rules, no training needed.

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Works everywhere

Outlook on the web, new Outlook for Windows, and classic Outlook for Windows and Mac.

How it works

1

Install the add-in

Add Inbox Search to Outlook. It begins indexing your mailbox in the background.

2

Index builds locally

A lightweight AI model creates a fingerprint of each email — all processing happens on your device.

3

Search instantly

Type what you're looking for in plain language. Results are ranked by meaning, not just keywords.

Your emails stay on your device

Inbox Search processes everything locally using a small AI model that runs in your browser. Microsoft Graph is used only to read your emails for indexing — nothing is stored on our servers.

Read the full privacy policy →
  • No email content sent to external servers
  • No analytics or tracking cookies
  • No account creation required
  • Search index stored locally on your device only
  • Minimum required Microsoft Graph permissions

Frequently asked questions

Outlook's search is keyword-based — it only finds emails containing the exact words you type. Inbox Search uses a hybrid of semantic AI embeddings and keyword matching, so it understands meaning. Search for "travel expenses from the Amsterdam trip" and it will find relevant emails even if they don't contain those exact words. It also ranks results by relevance rather than just date.
No. All processing happens entirely on your device. The AI model runs locally in your browser using WebAssembly. Your email content is never transmitted to our servers or any third-party service. The search index is stored in your browser's local storage.
Inbox Search is designed to return results in under 500ms for a mailbox of 10,000 emails, and under 1.5 seconds for 50,000 emails. Results are ranked by relevance and appear as you type.
Inbox Search works with Outlook on the web (outlook.office.com and outlook.live.com), new Outlook for Windows, and classic Outlook for Windows and Mac. It runs as a standard Office Add-in inside Outlook's task pane.
Not in the current version. Microsoft Graph does not provide access to the Exchange Online In-Place Archive. Inbox Search indexes your primary mailbox, including all folders. Archive mailbox support may be added if Microsoft extends their API in the future.
Yes. Inbox Search will be available as a free Outlook add-in. There are no hidden costs, subscriptions, or premium tiers.

From the blog

Articles coming soon. We'll be writing about email productivity, Outlook search tips, and privacy-first tools.

Stop losing emails in your inbox

Inbox Search is coming soon as a free Outlook add-in. Fast, private, semantic search.

Coming Soon