LocalSynapse
AI-powered local file search for Windows. Search inside files by content and meaning. 100% offline, free, open-source. Everything alternative with content search.
Install / Use
claude mcp add LocalSynapse -- npx -y github:LocalSynapse/LocalSynapseIf the server publishes to npm under a different name, use that package instead — check the repo README.
MCP Server
Model Context Protocol server
Quality Score
Category
Content & MediaSupported Platforms
Tags
Our assessment of LocalSynapse
LocalSynapse scores 65/100 on our quality scale, 1105th of 1,174 Content & Media skills we index.
Its MCP Server is 2.3 KB long, split into 6 sections and no code examples: moderately detailed.
It has 10 GitHub stars, so there is little community track record yet; judge it on its content.
Maintenance, license and trust
- The repository was last updated 3 days ago, so LocalSynapse is actively maintained.
- It is released under the Apache-2.0 license, a permissive license that allows use, modification and commercial use with attribution.
- Its trust signals score 97/100, with no cautions. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
LocalSynapse compared with similar skills
All 4 of these similar skills score higher than LocalSynapse; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| LocalSynapse (this skill)by LocalSynapse | 65 | 10 | 3d ago | MCP Server |
| Agent-Reachby Panniantong | 100 | 99.4k | 4d ago | CLAUDE.md |
| headroomby headroomlabs-ai | 100 | 76.0k | 2d ago | CLAUDE.md |
| CowAgentby zhayujie | 100 | 47.5k | today | CLAUDE.md |
| Scraplingby D4Vinci | 100 | 88.6k | today | MCP Server |
Frequently asked questions
- How do I install LocalSynapse?
- Run
claude mcp add LocalSynapse -- npx -y github:LocalSynapse/LocalSynapse. The install tabs above show the steps for each supported agent. - Which AI agents does LocalSynapse work with?
- It is written for Claude Code and Claude Desktop, as a MCP Server file. Other agents that read the same format can often use it too.
- Is LocalSynapse safe to use?
- It is Apache-2.0-licensed and scores 97/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is LocalSynapse still maintained?
- The repository was last updated 3 days ago, so LocalSynapse is actively maintained.
Skill content
View source on GitHubLocalSynapse
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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headroom
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Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.