Second Brain for AI
UnclaimedOne shared memory layer for all your AI tools, self-hosted and platform-independent.
Visit WebsiteFreemiumVisit Website
Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Provides a unified context across multiple AI tools, reducing repetition.
Biggest con
Requires some technical setup for deployment and configuration.
TL;DR - Second Brain for AI
- Centralized memory for all AI tools.
- Self-hosted on Cloudflare's free tier.
- Semantic search for context recall.
Pricing: Free plan available
Best for: Growing teams
What is Second Brain for AI?
Second Brain for AI is a self-hosted memory layer designed to provide a consistent context across various AI tools like Claude, ChatGPT, and Cursor. It addresses the problem of re-explaining context to different AI applications by centralizing your projects, decisions, and preferences in a single, personal knowledge base. Unlike built-in AI memories, this solution gives users full ownership and control over their data, ensuring it's not tied to any single platform.
The tool allows users to store anything from ideas and decisions to project context, and then recall it later using semantic search, meaning it finds relevant information even if the exact words weren't used during saving. It integrates with various capture methods including a CLI, Obsidian plugin, iOS shortcuts, and a browser extension, making it easy to populate the memory from anywhere. The entire system is designed to be self-hosted on Cloudflare's free tier, utilizing Cloudflare Workers, D1 SQLite, Vectorize, and Workers AI, making it accessible and cost-effective for personal use.
Pros & Cons
Pros
- Provides a unified context across multiple AI tools, reducing repetition.
- User-owned and controlled data, not tied to any single AI platform.
- Free to host on Cloudflare's free tier for personal scale.
- Supports various input methods for easy memory capture.
- Utilizes semantic search for intelligent recall, not just keyword matching.
Cons
- Requires some technical setup for deployment and configuration.
- Reliance on Cloudflare's ecosystem, though on the free tier.
- May require manual integration with some less common AI clients.
Key Features
Store ideas, decisions, and project contextSemantic search for recalling memories by meaningAppend updates to existing entries without duplicatesReplace content of existing entriesBrowse recent memories by dateDelete entriesCLI for terminal interaction (remember, recall)Obsidian plugin for automatic note syncing
Pricing Plans
Free TrialFree
$0 USD per month
- Unlimited public/private repositories
- Dependabot security and version updates
- 2,000 CI/CD minutes/month (Free for public repositories)
- 500MB of Packages storage (Free for public repositories)
- Issues & Projects
- Community support
Team
$4 USD per user/month
- Everything included in Free
- Access to GitHub Codespaces
- Repository rules
- Multiple reviewers in pull requests
- Draft pull requests
- Code owners
- Required reviewers
- Pages and Wikis
- Environment deployment branches and secrets
- 3,000 CI/CD minutes/month (Free for public repositories)
- 2GB of Packages storage (Free for public repositories)
- Web-based support
Enterprise
Starting at $21 USD per user/month
- Everything included in Team
- Data residency
- Enterprise Managed Users
- User provisioning through SCIM
- Enterprise Account to centrally manage multiple organizations
- Environment protection rules
- Repository rules
- Audit Log API
- SOC1, SOC2, type 2 reports annually
- FedRAMP Tailored Authority to Operate (ATO)
How Second Brain for AI's pricing compares
At $4/mo, Second Brain for AI is the most affordable of its 3 direct competitors.
Entry paid plan, monthly.
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Second Brain for AI FAQ
How does Second Brain for AI ensure my data privacy and ownership?
Second Brain for AI is designed for self-hosting on your own Cloudflare account. This means your data resides entirely within your personal Cloudflare storage (D1 SQLite and Vectorize), giving you full control and ownership, unlike AI tools with built-in memory that might control or limit access to your data.
What specific Cloudflare services does Second Brain for AI leverage for its functionality?
The project utilizes several Cloudflare services: Cloudflare Workers for serverless execution, D1 SQLite for persistent data storage, Vectorize for vector embeddings enabling semantic search, and Workers AI for AI capabilities. All these are designed to operate within Cloudflare's free tier for personal use.
Can I integrate Second Brain for AI with AI tools not explicitly listed, such as a custom-built AI agent?
Yes, Second Brain for AI provides a comprehensive API reference with endpoints like /capture, /append, /update, /list, and /chat. This allows developers to integrate their custom AI clients or other applications by making standard HTTP requests to their self-hosted worker URL, authenticated with a secure token.
How does the 'semantic search' feature work, and what are its benefits compared to traditional keyword search?
Semantic search in Second Brain for AI allows you to recall memories based on their meaning and context, rather than requiring exact keywords. This is achieved by converting your stored memories into vector embeddings (using Cloudflare Vectorize) and then comparing the semantic similarity of your query to these embeddings, surfacing relevant notes even if the phrasing is different from the original input.
What is the Model Context Protocol (MCP) client mentioned, and how does Second Brain for AI interact with it?
The Model Context Protocol (MCP) is a standard for AI clients to interact with external context providers. Second Brain for AI is built with an MCP TypeScript SDK and offers MCP endpoints in its API, allowing it to serve as a memory layer for any AI client that supports or can be adapted to use the MCP for context retrieval during conversations.
Source: github.com