Live demos of every
moment that matters
Midstream turns the Playwright tests you already have into clickable, shareable demos. Review what users will actually see — before it ships.
Trusted by engineering teams shipping every day
The platform
From a single test to
an entire demo library.
One line of code is all it takes. Midstream handles capture, playback, routing, and review — across every PR.
01 / Capture
Every checkpoint, captured.
Drop midstreamCheckpoint() into your Playwright tests. We snapshot the full browser state — DOM, cookies, storage, network.
02 / Replay
Resume from anywhere.
Open a checkpoint URL and land exactly where the test left off.
03 / Review
Demos on every PR.
Automatic comments link your team to live demos of the moments that matter.
04 / Collaborate
Feedback before merge.
Stakeholders click through real flows, leave comments tied to checkpoints.
05 / Agents
AI-ready surfaces.
Give agents a real environment to verify their work — not a screenshot.
One line of code
Drop it in.
That's it.
Already writing E2E tests? You already have demos. No new infrastructure, no rewrites, no maintenance.
import { test } from '@playwright/test';import { midstreamCheckpoint } from '@midstream/sdk/playwright'; test('user can sign up', async ({ page }) => {await page.goto('/signup');await page.fill('#email', 'demo@midstream.studio');await page.click('button');await midstreamCheckpoint(page, 'signup-success'); // ← that's it.});"We went from screenshotting our PRs in Slack to handing reviewers a live link. Code review became a product review."
