YC Spring 2026 (P26) company

TesterArmy

Test your app with AI, catch bugs before users do

b2bengineering, product and designopen source110 public signals

About TesterArmy

TesterArmy is an AI agent that tests websites and mobile apps. It monitors production on a schedule and runs automatically on every GitHub Pull Request, delivering screenshots, recordings, and actionable bug reports. Describe tests in plain English. The agent handles login flows, OAuth, and OTPs, no scripts to write or maintain. We catch the regressions and UX issues that code review misses.

Public traction evidence

Each signal links to the public source used for attribution.

  1. X

    this is what AUTOMATED UI testing looks like

    this is what AUTOMATED UI testing looks like

  2. Hacker News

    Launch HN: TesterArmy (YC P26) – Agents that test web and mobile apps

    Hey HN - we’re Oskar, Szymon, and Piotr, and we’re building TesterArmy ( https: tester.army ). TesterArmy is an agentic testing platform that runs end-to-end checks before deployment and in production. Instead of wasting hours on manual testing or maintaining static scripts, we...

  3. X

    T̶e̶s̶t̶ Make something people want

    T̶e̶s̶t̶ Make something people want

  4. X

    The CTO of @novuhq put two numbers on switching QA to TesterArmy: flaky tests cut in half, and merges about 30% faster now that every pull request gets tested against live staging.

    The CTO of @novuhq put two numbers on switching QA to TesterArmy: flaky tests cut in half, and merges about 30% faster now that every pull request gets tested against live staging. Read the full story: https://t.co/cl8Fq3OVoh

  5. X

    LET'S GET THIS STRAIGHT: YOU CAN USE TESTERARMY FOR FREE.

    LET'S GET THIS STRAIGHT: YOU CAN USE TESTERARMY FOR FREE. The math: - 25 free runs for them at signup - 100 for each of you when they go paid - No cap on invites Sign in and invite a friend who still tests by hand. Everything else happens on its own. https://t.co/7qDsv2BFMe

  6. LinkedIn

    I’ve known Oskar Kwaśniewski for 5 years.

    I’ve known Oskar Kwaśniewski for 5 years. We met when I was 15, working at a small Polish company. We had no clue what mobile or React Native really was, but we somehow had two apps to maintain. So we learned it together. Then we both joined Callstack, which was a game changer...

  7. X

    For anyone working on a React Native or Expo project, this is a really great resource ↓

    For anyone working on a React Native or Expo project, this is a really great resource ↓

  8. X

    pov: you're running a company in 2026

    pov: you're running a company in 2026