Localsynapse
About
AI-powered local file search for Windows. Search inside files by content and meaning. 100% offline, free, open-source. Everything alternative with content search.
Details
- Author
- LocalSynapse
- GitHub stars
- 6
- Downloads
- 629
- Categories
- Other
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- Hybrid search combining BM25 and local AI embeddings, with strong Korean/English support.
- Reads PDF, Word, PowerPoint, Hangul (HWP), CSV, Markdown, and plain text.
- Faithful Excel reading: cell coordinates, merged ranges, correct types, up to 25 MB.
- Local email search across .eml, .msg, .mbox, and exported mailbox JSON.
- Built-in MCP server for AI assistants with local, source-attributed access.
- All indexing, search, and embedding run locally; files never leave your device.
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
LocalsynapseCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Download the latest installer from the GitHub Releases page and run it. Indexing and search happen automatically; the built-in MCP server is ready for your AI assistant to connect.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"localsynapse": {
"localsynapse": {
"command": "path/to/LocalSynapse.exe",
"args": [
"mcp"
]
}
}
}
}McpServers
{
"localsynapse": {
"command": "path/to/LocalSynapse.exe",
"args": [
"mcp"
]
}
}LocalSynapse
AI-powered local search for your files and email on Windows. Find anything by keyword or by meaning —
and let your AI assistant read your documents and spreadsheets — all on your own machine.
Features
- Hybrid search — full-text (BM25) and semantic (local AI embeddings) together, with first-class
Korean/English handling.
- Reads your formats — PDF, Word, PowerPoint, Hangul (HWP), CSV, Markdown, plain text, and more.
- Faithful spreadsheets — Excel files are read with their structure intact: cell coordinates, merged
ranges, and correct types (dates stay dates, numbers stay numbers). Large workbooks parse quickly, up to
25 MB.
- Local email search — your mail in .eml, .msg, .mbox, and exported mailbox JSON is searchable
alongside your documents — by sender, subject, and body.
- Works with your AI — a built-in MCP server lets assistants like Claude search your index and read a
faithful, structured view of your spreadsheets — locally, with source attribution.
- Local-first & private — search, indexing, and AI embedding run on your machine, and your files and
their content never leave your device.
Download
Get the latest installer from the Releases page.
Project site: localsynapse.com
What's in this repository
This repository hosts release artifacts only — Windows installers and their SHA-256 checksums on the Releases page. Active development happens in a private repository; the source tree is no longer published here from v2.15.0 onward.
Historical source from v1.0.0 through v2.14.0 remains in the repository's git history per the Apache License 2.0 under which those versions were distributed. Anyone who needs a snapshot of those versions can recover them from the tag history or from public forks.
License
Apache License 2.0 — see LICENSE.
The license covers the distributed binaries and all source code that was published in this repository through v2.14.0. v2.15.0 and later are distributed as installer binaries only.
Issues and questions
Use the Issues tab to report bugs, request features, or ask questions about LocalSynapse.
— Ryan
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