Nessie is a shared context layer that auto-syncs AI conversations across major providers such as ChatGPT, Claude, Gemini, Perplexity and Codex into a queryable, structured knowledge base accessible to both humans and agents. The platform preserves reasoning and decision-making context so thinking compounds over time rather than starting fresh with each session, turning scattered AI conversations and documents into a shareable, owned AI brain. Nessie is based in the San Francisco Bay Area and is part of Y Combinator's Fall 2025 batch.
Nessie
ActiveA shared context layer for you, your team, and your agents
Total raised
$500K
1 round
Stage
Seed
Jan 2025
Team
1-10
since 2025
Pricing
—
Founded
2025
San Francisco, United States
Agent-ready
—
Auto-syncs AI conversations across ChatGPT, Claude, Gemini, Perplexity, and Codex
Structured, queryable knowledge base from scattered AI chats
Shared context layer accessible to both humans and agents
Preserves reasoning and decision-making context over time
Turns conversations and documents into an owned AI brain
Cross-provider context unification
Shareable knowledge base for teams
Persistent context so work compounds across sessions
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Jan 2025 Seed $500K ● Y Combinator
Capital network
$500K raised ·1 backer·10 network links
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- What is Nessie?
- Nessie is a shared context layer that auto-syncs AI conversations across providers like ChatGPT, Claude, Gemini, Perplexity, and Codex into a queryable, structured knowledge base for both humans and agents.
- What problem does it solve?
- It preserves reasoning and decision-making context so thinking compounds over time rather than starting fresh with each session, turning scattered conversations and documents into a shareable, owned AI brain.
- Which AI providers does it support?
- Nessie syncs conversations across major providers including ChatGPT, Claude, Gemini, Perplexity, and Codex.
- Is the knowledge base shareable?
- Yes. The context layer is accessible to you, your team, and your agents, making accumulated context shareable across a group.
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