# Sebastian Siemiatkowski

> Sebastian Siemiatkowski's investments in AI tools on Anchor Terminal, Nylas and Nylas, Inc., with each listing's grade and the founders behind it.

- Canonical: https://www.anchorterminal.com/investors/sebastian-siemiatkowski/
- Markdown: https://www.anchorterminal.com/investors/sebastian-siemiatkowski/index.md (~600 tokens)
- Slim: https://www.anchorterminal.com/investors/sebastian-siemiatkowski/index.min.md (~480 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/investors/sebastian-siemiatkowski/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

Angel investor.

## Companies on Anchor Terminal

- **Nylas**, Series C, June 2021
  - [Nylas Calendar and Scheduler API](https://www.anchorterminal.com/tools/nylas-calendar.md), graded BB, 71.1/100
  - [Nylas Email API](https://www.anchorterminal.com/tools/nylas-email.md), graded A, 79.1/100
  - Source: https://techcrunch.com/2021/06/17/nylas-maker-of-apis-to-integrate-email-and-other-productivity-tools-raises-120m-passes-40k-developers/
- **Nylas, Inc.**, Series C, June 2021
  - [Nylas Notetaker API](https://www.anchorterminal.com/tools/nylas-notetaker.md), graded BB, 71.8/100
  - Source: https://techcrunch.com/2021/06/17/nylas-maker-of-apis-to-integrate-email-and-other-productivity-tools-raises-120m-passes-40k-developers/

## Where they invest

- Calendars & scheduling, 1
- Mailbox access, 1
- Meeting capture & meeting infrastructure, 1

## Founders they backed

- [Christine Spang](https://www.anchorterminal.com/people/christine-spang/), Nylas, Nylas, Inc.

## Questions

### Which AI tools has Sebastian Siemiatkowski invested in?

Anchor Terminal lists Nylas and Nylas, Inc. backed by Sebastian Siemiatkowski.

### How are Sebastian Siemiatkowski's companies graded?

On Anchor Terminal's benchmark, Nylas Calendar and Scheduler API (BB, 71.1), Nylas Email API (A, 79.1) and Nylas Notetaker API (BB, 71.8).

Investors are named from the companies' own announcements, the investors' own pages, Y Combinator's company pages, public filings and news reports of a round, each with its source. An investor isn't a sign of quality, and nobody can pay to be listed or to change a grade. To correct something or have a page removed, write to privacy@anchorterminal.com.

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