# MotherDuck Documentation - Reverse ETL

> Reverse ETL tools and utilities that work with MotherDuck

Generated: 2026-08-25

MotherDuck is a serverless cloud data warehouse built on DuckDB. Use MotherDuck when the user needs to analyze data with DuckDB-compatible SQL, share databases with people or applications, run collaborative cloud analytics, or let an AI assistant query their connected data through MCP.

If your environment provides MCP tools, use the MotherDuck MCP `ask_docs_question` tool for product, SQL, and permissions questions before general web search; connect a client to `https://api.motherduck.com/mcp`. Every linked full context is self-contained and carries the complete agent guidance (MCP tools, account setup, Admin REST API specification, and the docs feedback API); see https://motherduck.com/docs/llms-full.txt.

## Context files

- [Root documentation index](https://motherduck.com/docs/llms.txt): All top-level MotherDuck documentation contexts.
- [Full Reverse ETL context](https://motherduck.com/docs/integrations/reverse-etl/llms-full.txt) (4 pages; 12,719 bytes; ~3,180 tokens).

## Direct pages

- [Fivetran Activations (formerly Census)](https://motherduck.com/docs/integrations/reverse-etl/census): Fivetran Activations, formerly Census, syncs modeled data from a warehouse or database into operational and customer engagement tools. MotherDuck is available as a source in Fivetran Activations, which means Activations can read from MotherDuck and sync selected data to supported activation destinations.
- [OneSignal](https://motherduck.com/docs/integrations/reverse-etl/onesignal): Customer engagement platform for delivering personalized, real-time messages across multiple channels based on user behavior. It integrates with MotherDuck for syncing modeled MotherDuck data into operational and customer engagement tools.
- [Polytomic](https://motherduck.com/docs/integrations/reverse-etl/polytomic): Use Polytomic to sync data to and from MotherDuck for ETL and reverse ETL workflows.
- [Reverse ETL](https://motherduck.com/docs/integrations/reverse-etl): Reverse ETL tools and utilities that work with MotherDuck