Osprey Studio

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Developer & Risk Tooling · Apache 2.0 Open Source

Visual rule authoring IDE and transaction simulation workbench.

Osprey Studio empowers compliance analysts and risk officers to author, test, and simulate CEL detection policies without waiting for engineering release cycles.

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React 19TypeScriptTailwind CSSVisual CanvasCEL Compiler

Target Audience

Risk & Compliance

Zero coding required

Simulation Speed

100k txns/s

Instant offline replay

Output Format

Pure CEL

Zero lock-in, portable rules

Version Control

Git-Backed

Audit trail for every rule edit

Overview & Engineering Philosophy

Defining fraud rules has historically been a bottleneck: risk teams write policy specs in Word documents, engineers convert them into code weeks later, and backtesting requires staging databases.

Osprey Studio provides an intuitive visual IDE where analysts build rules using blocks and boolean expressions, test them against historical transaction datasets in seconds, and export validated CEL configurations.

Changes can be deployed dynamically to live Osprey engines via the hot-reload `/rules/reload` endpoint with zero downtime.

Architecture Specifications

Node-Based Visual Rule Canvas

Drag-and-drop conditions, velocity limits, and threshold triggers that transpile directly into valid Google CEL.

Historical Backtesting Engine

Replay months of transaction logs to calculate false-positive and false-negative rates before activating a rule in production.

Hot-Reload Deployment

Publish updated rule sets to fleet of Osprey engines with instant propagation and zero transaction drop.

Multi-Tenant Rule Partitioning

Create distinct policy sets for different banking partners, customer tiers, or regional jurisdictions.

Studio Local Development

# Clone and launch Studio development server
git clone https://github.com/opensource-finance/osprey.git
cd osprey/studio
bun install
bun run dev

# Open Studio at http://localhost:5173
# Connect to your local Osprey engine at http://localhost:8080