QuantConnect / Lean

git clone https://github.com/QuantConnect/Lean.git v2.4.0.1 · 9y ago 🔥 on GitHub Trending today

Event-driven C# and Python engine for backtesting and live-trading algorithmic strategies across multiple financial markets.

Why you might care

Modular platform with pluggable models for major extension points, plus alternative data and live-trading support. Ships with a CLI and Docker workflow for running backtests and deploying algorithms locally or via QuantConnect's cloud.

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22k

★ total · +1% this week

5.3k

forks · 296 open issues

Star history (as recorded here)

2026-10-20 · 22,116 ★ 2026-10-27 · 22,260 ★

LanguageC#

LicenseApache-2.0

Created2014-11-28 (11y ago)

Last pushtoday

Watchers497

OwnerOrganization

Seen on GitHub Trending

2026-10-26 — #11 daily in c# · +31 ★

GitHub topics

algorithm algorithmic-trading-engine c-sharp finance forex lean-engine options python quantconnect stock-indicators trading trading-algorithms trading-bot trading-platform trading-strategies

README

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Blurb generated by claude-haiku-5-5 today. Star deltas marked ~ are extrapolated from partial history.