Flowsurface: Open-Source Orderflow Platform for Crypto Markets

Most serious traders eventually come to a realization: candlesticks are merely a derivative of the actual market processes. The real picture is formed in the order book, the trade flow, and the shifting of liquidity. Orderflow analysis tools — DOM heatmaps, cluster charts (footprints), trade feeds — have traditionally been the privilege of paid platforms: Bookmap, ATAS, Quantower, Sierra Chart. Subscription prices start at $50/month and can easily exceed $200.

Flowsurface is a completely free, open-source alternative written in Rust. The project has already gained 1,500+ stars on GitHub, 289 forks, and is actively developed (10 releases, the latest being v0.8.8 from April 24, 2026).

Why Does a Trader Need Orderflow?

Classical technical analysis works with "ready-made" candles: open, close, high, and low prices over a period. But a candle with the same body can hide fundamentally different pictures:

• Candle in a thin market — volume is distributed evenly, no large players present.
• Candle in a thick market — aggressive buyers/sellers literally "chew through" the order book, leaving characteristic clusters in the footprint.

Orderflow lets you see:

• Where liquidity sits (bid and ask walls in the order book).
• Where it shifts (pull/stack — being removed or built up).
• Who dominates — aggressive buyers or sellers (by delta, imbalances, pace).
• Traps — false breakouts where spoofing hides behind the walls.

What Flowsurface Can Do

Heatmap DOM — Order Book Heat Map

The flagship feature and the application's calling card. Flowsurface visualizes historical market depth (L2 order book) in real time as a color map, where:

• X-axis — time.
• Y-axis — price.
• Color/brightness — order volume at a given price level.

You literally see liquidity appear, move, and disappear. Adaptive price grouping and Volume Profile overlay (fixed or visible range) are supported.

Footprint (Cluster Charts)

A mode that groups trades by time or tick count, overlaid on a candlestick chart. Available features:

• Imbalance — highlighting buy/sell imbalances at each price level.
• Naked POC — "naked" points of control that haven't yet been tested by price.
• Various clustering modes.

Depth Ladder

A classic DOM (Depth of Market) showing the current state of the L2 order book with recent trade volumes overlaid at each price level.

Time & Sales

A scrolling real-time trade feed — useful for tracking large executions and aggression patterns.

Candlestick Chart

Support for both standard time intervals and custom tick bars.

Multi-Pane Layouts

Multiple panes with different instruments/timeframes, linking for quick ticker switching, multi-monitor support.

Audio Alerts

Audio feedback from trade flow — useful for contextual perception of market pace without constantly watching the screen.

Supported Exchanges

• Binance (USDⓈ-M and COIN-M futures)
• Bybit (derivatives)
• Hyperliquid (DEX derivatives)
• OKX (perpetual futures)
• MEXC (futures)

Data comes directly from public REST APIs and exchange WebSockets — no routing through third-party servers.

Tech Stack

Flowsurface is a native desktop application, not an Electron wrapper:

• Language: Rust (99.3% of the codebase).
• GUI: Iced — a declarative GUI framework for Rust.
• License: GPL-3.0.

Rust provides:

• Low latency — critical during fast market movements.
• Minimal memory usage — Flowsurface is one of the lightest orderflow tools available.
• Cross-platform — macOS (Universal), Windows, Linux.

Historical Data

By default, Flowsurface captures and displays trades in real time via WebSocket. For Binance, historical trade loading is available:

• data.binance.vision — fast batch download of daily files.
• REST API (/fapi/v1/aggTrades) — slower per-trade loading with rate limits.

Historical trade loading for Bybit and Hyperliquid is not yet supported due to lack of a suitable REST API. OKX — in development.

Installation

Pre-built Binaries

Executables for all platforms are available on the releases page.

Note (macOS): The application is not code-signed. On first launch, macOS will show a Gatekeeper warning. Go to System Settings → Privacy & Security and click "Open Anyway."

Building from Source

git clone https://github.com/flowsurface-rs/flowsurface
cd flowsurface

cargo build --release
cargo run --release

Dependencies:

• Linux (Debian/Ubuntu): sudo apt install build-essential pkg-config libasound2-dev
• macOS: xcode-select --install
• Windows: no additional dependencies required.

Comparison with Paid Alternatives

Flowsurface doesn't cover traditional markets (stocks, CME futures) and focuses exclusively on crypto derivatives. That's its niche, and it does the job excellently — for free, fast, and transparently.

Who Is Flowsurface For

• Scalpers and intraday traders on crypto markets who read the order book and trade flow.
• Microstructure researchers who want to observe liquidity without a subscription fee.
• Developers who want to fork and extend the tool for their needs (GPL-3.0 allows it).
• Orderflow beginners who want to try heatmaps and footprints without financial risk.

Links

• 🌐 Website: flowsurface.com
• 💻 GitHub: flowsurface-rs/flowsurface
• 📦 Releases: Releases
• 💬 Discord: Join

Conclusion

Flowsurface is a rare example of an open-source project that genuinely competes with commercial products in a narrow professional niche. If you trade crypto derivatives and want to see the market "from the inside" — through the order book, liquidity, and trade flow — this is one of the best free ways to start.

And if you're a Rust developer — it's also an excellent example of native GUI application architecture using Iced with real WebSocket data streams.