Free interactive preview
Replay the book.
See what changed.
Capture or load structured market data, move backward and forward through time, and inspect the exact L1, L2, or candle state at every event.
No account. No install. Demo data is built in.
Open the live interface
42 + 42book levels retained
Exact decimalsno float drift
L1 / L2top or full depth
OpenCandleschema-aware replay
How it works
A debugger for market state.
The interface stays simple until you ask for more detail.
- 01
Load a session
Start with the deterministic demo, connect live, or bring a recorded session when import opens.
- 02
Move through time
Scrub, seek, change speed, or jump to a bookmark without rebuilding state by hand.
- 03
Inspect the event
Compare top of book, cumulative depth, and schema-native records at the exact same timestamp.
Under the hoodExact replay, OpenCandle, and schema boundaries +
Deterministic stateSame session plus same cursor produces the same view.
Fixed-point valuesPrice, size, and cumulative depth do not round through binary floats.
Open formatsOpenCandle V1, tuple feeds, JSON records, and protobuf-shaped input normalize at the adapter boundary.
Shape the next build
What would you replay?
One useful answer is worth more than a dashboard full of vanity metrics. Tell us the job; contact details are optional.
Ready when you are