Phone Harness
Phone Harness is a YC Fall 2026 (F26) company. Based in San Francisco, CA, USA. Team of 1.
About Phone Harness
Summary
Phone Harness gives AI agents direct control over iPhone and Android devices, letting them tap, type, and scroll through any app the way a human would. It targets developers building agent-based workflows who need phone automation without jailbreaks, custom APIs, or app installs. The tool replaces manual phone interaction and brittle per-app integration work.
Business model
Hosted phone rental, with a self-hosted open-source option under the MIT license.
Go-to-market
Developers and agent builders adopt the open-source library directly from GitHub, then convert to hosted phone capacity through the platform; enterprise or team buyers can book a demo for a more guided path.
From the Y Combinator listing
Let your agent control your phone
Phone Harness is the most popular open-source harness for phone automation with 3,800+ GitHub stars. We enable agents to tap, type, and scroll on your personal phone or cloud-hosted phones. Supports iPhone and Android. No jailbreak, API, or app installation needed.
Facts
- B2B / B2B -> Engineering, Product and Design
- San Francisco, CA, USA
- 1
- Active
- Early
Founders (1)
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