Composal
Composal is a YC Fall 2026 (F26) company. Based in London, England, United Kingdom. Team of 3.
About Composal
Summary
Composal builds automated pre-release testing for software teams shipping products with AI agents. It deploys a swarm of agents that navigate an application as real users would, exercising critical flows and edge cases in parallel. Teams get video recordings, logs, and reproduction steps for every failure, replacing manual click-through testing before each release.
Go-to-market
Engineering and product teams at B2B software companies are the buyers. They start by pointing Composal at a URL and connecting repositories or product specs, making adoption self-serve from an existing development workflow.
From the Y Combinator listing
Swarms of agents acting like users to find bugs before release
Check features, not code. Composal sends a swarm of agents to use your product like your users do. They test real flows and edge cases to show you what works, what breaks, and if it’s ready to ship.
Facts
- B2B / B2B
- London, England, United Kingdom
- 3
- Active
- Early
Founders (3)
- Jan Hendrik Moehlmann
Score every batch against your own thesis
GPAgent's sourcing agent reads every company in a batch, scores each one against your fund's thesis in a private workspace, and lines up the founders worth meeting before Demo Day. You decide who to contact. Your scores, notes, and pipeline never appear on these pages.
How Accelerator intelligence works