Product overview
Deterministic market replay, in the browser.
Matchstick Replay lets you step through a recorded trading session event by event and inspect the exact order-book state at any point. No install and no data-vendor dependency. The public demo needs no account; the app is invite-only.
The problem
Market data is ephemeral. Every order-book update replaces the last one. When a trader, researcher, or compliance analyst needs to know what the book looked like at a specific moment — at a fill, a flash crash, an FOMC release — the state is already gone.
Who it's for
Algo traders who write strategies and need to verify what the order book actually looked like at a backtest fill — not a simulated approximation, but the real recorded state, reconstructed deterministically, with source provenance.
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Verify fills against real history
Load the recorded session from the moment your strategy executed. Step to the fill event. Inspect bid/ask depth and spread as they actually were — not as a backtest engine approximated them.
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Trust the reconstruction
Spread and midpoint use exact decimal arithmetic, so they carry no floating-point drift. Every session carries source provenance. The same input always produces the same state — that's the definition of deterministic.
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No vendor lock-in
Bring your own recorded sessions. Matchstick imports Tardis.dev order-book files and OpenCandle V1. No data-vendor subscription required to start — the built-in public demo works immediately.
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Reproducible evidence
Bookmark events. Inspect state with source provenance. The same input always produces the same state — screenshots and screen recordings are not evidence, reproducible reconstruction is.
What it does today
Invite-only preview
- Runs in any modern browser. No install. The public demo needs no account; the app is invite-only.
- Built-in synthetic sample sessions, ready to open.
- Import your own recorded sessions (Tardis.dev L2 CSV or OpenCandle V1). Sessions stay in your browser.
- Steps forward and backward through events. Seeks by timestamp.
- Reconstructs and displays full order-book depth at each event.
- Spread and midpoint use exact decimals, not floats.
- Source provenance tracked per session. Sessions can be exported.
What it does not do yet
No live market feed in the free demo. No broker connections.
No payments yet. The public demo needs no account.
No multi-instrument sync.
No strategy execution or backtesting engine.
No built-in data feed. Bring a recorded session.
No P&L tracking or performance analytics.
Founder
Matthew Hendricks. Former product manager at a futures trading platform, where he worked on market replay and tick replay, starting from customer discovery, interviews and QA on the older replay. Now building Matchstick Replay, with open input formats.