# Keith Block (slim)

> Keith Block's investments in AI tools on Anchor Terminal, AssemblyAI and AssemblyAI, Inc., with each listing's grade and the founders behind it.

- Full: https://www.anchorterminal.com/investors/keith-block/index.md (~550 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/investors/keith-block/index.json · canonical https://www.anchorterminal.com/investors/keith-block/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Angel investor.

## Companies on Anchor Terminal

- **AssemblyAI**, Series C, December 2023
  - [AssemblyAI Speech-to-Text (Universal)](https://www.anchorterminal.com/tools/assemblyai-stt.md), graded B, 66.9/100
  - Source: https://www.assemblyai.com/blog/announcing-our-50m-series-c-to-build-superhuman-speech-ai-models
- **AssemblyAI, Inc.**, Series C, December 2023
  - [AssemblyAI Voice Agent API](https://www.anchorterminal.com/tools/assemblyai-voice-agent.md), graded B, 64.6/100
  - Source: https://www.assemblyai.com/blog/announcing-our-50m-series-c-to-build-superhuman-speech-ai-models

## Where they invest

- Speech-to-text, 1
- Conversational voice agents, 1

## Founders they backed

- [Dylan Fox](https://www.anchorterminal.com/people/dylan-fox/), AssemblyAI, AssemblyAI, Inc.

## Questions

### Which AI tools has Keith Block invested in?

Anchor Terminal lists AssemblyAI and AssemblyAI, Inc.

### How are Keith Block's companies graded?

On Anchor Terminal's benchmark, AssemblyAI Speech-to-Text (Universal) (B, 66.9) and AssemblyAI Voice Agent API (B, 64.6).

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.