# Jonas Dücker

> Jonas Dücker is co-founder of CMO and COO. ROOK on Anchor Terminal, with grades, an about and public profiles.

- Canonical: https://www.anchorterminal.com/people/jonas-ducker/
- Markdown: https://www.anchorterminal.com/people/jonas-ducker/index.md (~700 tokens)
- Slim: https://www.anchorterminal.com/people/jonas-ducker/index.min.md (~480 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/people/jonas-ducker/index.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

Co-founder, CMO and COO.

- LinkedIn: https://www.linkedin.com/in/jonas-ducker-37460bb3/

## What Jonas builds

- [ROOK](https://www.anchorterminal.com/tools/rook.md), graded C, 55.1/100, in Health records & wellness data. ROOK Connect, from Rookeries Development Corp., collects health data from wearables and phone health stores, normalises it into sleep, physical and body summaries and events, and sends it by webhook or a REST API. Co-founder, CMO and COO, researched 2026-10-28.

## Works with

- [Daniel Martinez](https://www.anchorterminal.com/people/daniel-martinez/), Co-founder and CTO
- [Jose Esquivel](https://www.anchorterminal.com/people/jose-esquivel/), Co-founder and CQA
- [Marco Benítez](https://www.anchorterminal.com/people/marco-benitez/), Co-founder and CEO
- [Oscar Garcia](https://www.anchorterminal.com/people/oscar-garcia/), Co-founder and CFO

## Questions

### Who is Jonas Dücker?

Jonas Dücker is co-founder of CMO and COO.

### What does Rookeries Development Corp. make?

Anchor Terminal lists ROOK from Rookeries Development Corp.. ROOK Connect, from Rookeries Development Corp., collects health data from wearables and phone health stores, normalises it into sleep, physical and body summaries and events, and sends it by webhook or a REST API.

### How are Jonas's tools graded?

ROOK is graded C, 55.1 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://tryrook.io/
- https://tryrook.io/contact-us/
- https://tryrook.io/about-us/

These are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.

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