Elements
Inspect the reconstructed DOM at any instant: computed styles, box model, attributes, shadow roots. Copy a selector or find every session that clicked it.
Replay & DevTools
Full DevTools for a session that already happened.
Backstory does not record video. It captures the DOM and every change to it, then rebuilds the page in a sandboxed player with the panels an engineer expects, all synchronized to the scrubber.
Signals 0 fired
Why generated from this session
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A synthetic checkout session. Watch the promo-code struggle, the slow request, and the layout shift that displaced a click.
How it works
Structure, not pixels.
- Snapshot DOM tree with stable ids
- Mutations every change, coalesced per frame
- Interactions pointer, input, scroll, navigation
- Context console, network, errors, vitals
- Mirror sandboxed reconstruction
Correct or honest
If the recorder had to shed data under memory or bandwidth pressure, the replay shows a hatched gap with the reason instead of a wrong picture.
Checkpoints
A fresh snapshot every five minutes, on heavy route changes, and at segment boundaries keeps seeking cheap and recovery possible.
Asset archive
Stylesheets, fonts, and images are archived per release, so replays stay correct after your next deploy.
Panels
Everything DevTools shows, for the past.
Console
Every log with stack traces symbolicated through your uploaded source maps, plus a server tab with correlated backend logs.
Network
A waterfall synchronized to playback, GraphQL operation names, WebSocket frames, and the backend span tree under each request.
Performance
Web Vitals with attribution: the LCP element is highlighted, layout shifts are drawn as rectangles, the INP interaction is marked.
State
Redux, Zustand, Pinia, NgRx, TanStack Query, Apollo. Click an action and the replay jumps to it.
Application
Storage keys, cookie names, service worker state, routes, feature flags, experiments, release and device.
Accessibility
An axe-style audit of the reconstructed DOM at any time, focus order, missing labels, contrast failures.
Issues & Why
Every Signal in the session with a jump-to, and the AI explanation for any moment you select.
Fidelity
What we test, so you do not have to.
Nightlyseven real public pages are recorded and replayed in Chrome and in Safari's engine, then compared with the live page. Firefox runs in the same check.
97%+of the live page's text is in the replay, and element counts stay within 12%. Pixels differ by 0–20%, mostly third-party frames and fonts the page did not let us fetch.
34 KBgzipped SDK including console, network, vitals, consent, and sampling. The recording worker loads separately.
The story behind every bug.
Free for 1,000 sessions a month. Strict masking, conditional recording, and Signals are all included.
Get started
Replay your first session in five minutes.
Free for 1,000 sessions a month, no credit card. Or leave a work email and we will reach out about the private beta for healthcare and support teams.
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