Tapflow puts your team's iOS simulators and Android emulators in every teammate's browser, so QA stops queueing for the one Mac that happens to have the right build installed. A relay server you host serves the dashboard and API, stores your builds and recordings, and keeps accounts and device control on infrastructure you own. Agents on your Macs connect out to the relay and drive the simulators already installed there, injecting touches directly without WebDriverAgent or any cloud device pool. From the browser you tap, swipe, and pinch at about 30 frames per second, open deeplinks from the QA toolbar, sync the clipboard both ways, hear device audio, and cut the network to see how the app copes offline. The App Center takes .app.zip and .apk uploads and tracks each build from backlog to done, and sessions can be recorded and shared before the relay purges them after about 72 hours. CI pipelines and AI agents get a screenshot endpoint and scoped access tokens, deterministic YAML flows replay checks with a JUnit report, and roles keep viewers, QA, developers, and admins in their lanes. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.