# Momentic Mo — QA agents that bug-bash web and mobile apps on their own

> Point Mo at a URL and it plans, explores and bug-bashes your app, then files bugs with a replay.

- Org: Momentic
- Date: 2026-11-02
- Category: tool
- Source: https://momentic.ai/mo
- Canonical page: https://ai-tldr.dev/releases/momentic-mo-qa-agent/

## In short

Momentic launched Mo, a QA agent that explores web, iOS and Android apps, reports bugs with repro steps and recordings, and tests pull-request previews. On Momentic's own QA Bench it matched 269 bugs per pass versus 86 for the best Codex setup.

## What it is

Mo is Momentic's autonomous QA agent, launched on Hacker News by the YC W24 company on November 2, 2026. Given a URL, it explores the app in a real browser or emulator, reports each bug it reproduces with steps and a recording, and can turn runs into regression tests for every pull request.

## How it works

Mo's harness builds a graph of the app as it explores and forks large product areas into parallel sub-agents, with specialised agents for planning, finding elements, and reading images and video. A tunnel lets hosted agents reach private sites and local apps, and new PR testing runs against Vercel and Cloudflare deploy previews. Developers start sessions from the `qa` CLI, the app, a PR comment or a coding agent skill.

## Why it matters

On QA Bench, Momentic's own benchmark of 1,396 labelled bugs across four open-source apps, Mo matched 269.3 bugs per pass in 60 minutes at 84.2% precision, ahead of Codex (86.3), Claude Code (59.0) and Devin (27.0). Momentic built and graded the test with an LLM judge itself, so the numbers are a first-party claim. The cost per matched bug was $2.67, against $0.80 for Codex with GPT-6.1 Sol.

## Who it's for

QA engineers, product teams shipping web and mobile apps

## Try it

npx qa start "test https://your-app.com"

## Links

- [Launch HN](https://news.ycombinator.com/item?id=50339913)
- [QA Bench Write-up](https://momentic.ai/blog/qa-bench)
- [qa CLI](https://github.com/momentic-ai/qa)
- [Demo Video](https://www.youtube.com/watch?v=BFsM-Se1Fh8)