Lean
OPEN SOURCE
Algorithm trading engine.
About
Lean is an open-source algorithm trading engine that provides a flexible and powerful framework for backtesting and live trading across multiple asset classes.
Pricing
Pricing Type
Open Source
Free tier available
Last checked: February 22, 2026
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Key Facts
Categories
Platforms
Web
Self-Hosted
Company
QuantConnect
Founded
Founded in 2013
Country
Global
Language
English