TesterArmy

Test your app with AI, catch bugs before users do

Y CombinatorSpring 2026ActiveB2BEngineering, Product and DesignArtificial IntelligenceDeveloper ToolsB2B

What they do

Problem

Software teams miss regressions and UX bugs in web and mobile apps before users encounter them in production.

Solution

TesterArmy is an AI agent that automatically tests apps on schedules and on every GitHub pull request, producing screenshots, recordings, and actionable bug reports from plain-English test descriptions.

Who it's for

Developers and QA teams building and maintaining websites and mobile apps.

Founders

Szymon Rybczak

Founder

Co-founder & CEO of TesterArmy (YC P26). Youngest ever contributor to React Native (at 16), maintained open-source libraries with 3M+ downloads weekly. Worked on v0 iOS with Vercel. 5+ years of commercial experience. Working professionally since 14.

LinkedIn · X

Oskar Kwaśniewski

Founder

Co-founder & CTO of TesterArmy (YC P26). React Native Core Contributor (100+ PRs merged), created 5+ open-source libraries with over 2.5M downloads. Worked with Vercel, Meta, AT&T, and more.

LinkedIn · X