QuantConnect/Lean is a server-side project on GitHub with 21.1k stars, written primarily in C#. Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
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Lean Home | Documentation | Download Zip | Docker Hub | Nuget
LEAN is an event-driven, professional-caliber algorithmic trading platform built with a passion for elegant engineering and deep quant concept modeling. Out-of-the-box alternative data and live-trading support.
LEAN is modular in design, with each component pluggable and customizable. It ships with models for all major plug-in points.
QuantConnect Lean CLI is a command-line interface tool for interacting with the Lean algorithmic trading engine, which is an open-source platform for backtesting and live trading algorithms in multiple financial markets. It allows developers to manage projects, run backtests, deploy live algorithms, and perform various other tasks related to algorithmic trading directly from the terminal. The CLI simplifies the workflow by automating tasks, enabling seamless integration with cloud services, and facilitating collaboration with the QuantConnect community. It's designed for quant developers who need a powerful and flexible tool to streamline their trading strategies. Please watch the instructions videos to learn more.
Installation
pip install lean
Commands
Create a new project containing starter code
lean project-create
Run a local Jupyter Lab environment using Docker
lean research
Backtest a project locally using Docker
lean backtest
Optimize a project locally using Docker
lean optimize
Start live trading a project locally using Docker
lean live
Download the LEAN CLI Cheat Sheet for the full list of commands.
This section will cover how to install lean locally for you to use in your environment. For most users we strongly recommend the LEAN CLI which is prebuilt and runs on all platforms. Refer to the following readme files for a detailed guide regarding using your local IDE with Lean.
VS Code
VS
To install locally, download the zip file with the latest master and unzip it to your favorite location. Alternatively, install Git and clone the repo:
git clone https://github.com/QuantConnect/Lean.git
cd Lean
macOS
NOTE: Visual Studio for Mac has been discontinued, use Visual Studio Code instead
Install Visual Studio Code for Mac
Install the C# Dev Kit extension
Install dotnet 10 SDK:
To build the solution, either:
choose Run Task > build from the Panel task dropdown, or
from the command line run
dotnet build
To run the solution, either:
choose Run and Debug from the Activity Bar, then click Launch, or
click F5, or
from the command line run
cd Launcher/bin/Debug
dotnet QuantConnect.Lean.Launcher.dll
Linux (Debian, Ubuntu)
Install dotnet 10:
Compile Lean Solution:
dotnet build QuantConnect.Lean.sln
Run Lean:
cd Launcher/bin/Debug
dotnet QuantConnect.Lean.Launcher.dll
Windows
Install Visual Studio
Open QuantConnect.Lean.sln in Visual Studio
Build the solution by clicking Build Menu -> Build Solution (this should trigger the NuGet package restore)
Press F5 to run
Python Support
A full explanation of the Python installation process can be found in the Algorithm.Python project.
Local-Cloud Hybrid Development.
Seamlessly develop locally in your favorite development environment, with full autocomplete and debugging support to quickly and easily identify problems with your strategy. Please see the CLI Home for more information.
Issues and Feature Requests
Please submit bugs and feature requests as an issue to the Lean Repository. Before submitting an issue, please read the instructions to ensure it is not duplicated.
Mailing List
The mailing list for the project can be found on LEAN Forum. Please use this to ask for assistance with your installation and setup questions.
Contributors and Pull Requests
Contributions are warmly welcomed, but we ask you to read the existing code to see how it is formatted and commented on and ensure contributions match the existing style. All code submissions must include accompanying tests. Please see the contributor guidelines. All accepted pull requests will get a $50 cloud credit on QuantConnect. Once your pull request has been merged, write to us at [email protected] with a link to your PR to claim your free live trading. QC <3 Open Source.
A huge thank you to all our contributors!
Acknowledgements
The open sourcing of QuantConnect would not have been possible without the support of the Pioneers. The Pioneers formed the core 100 early adopters of QuantConnect who subscribed and allowed us to launch the project into open source.
Ryan H, Pravin B, Jimmie B, Nick C, Sam C, Mattias S, Michael H, Mark M, Madhan, Paul R, Nik M, Scott Y, BinaryExecutor.com, Tadas T, Matt B, Binumon P, Zyron, Mike O, TC, Luigi, Lester Z, Andreas H, Eugene K, Hugo P, Robert N, Christofer O, Ramesh L, Nicholas S, Jonathan E, Marc R, Raghav N, Marcus, Hakan D, Sergey M, Peter McE, Jim M, INTJCapital.com, Richard E, Dominik, John L, H. Orlandella, Stephen L, Risto K, E.Subasi, Peter W, Hui Z, Ross F, Archibald112, MooMooForex.com, Jae S, Eric S, Marco D, Jerome B, James B. Crocker, David Lypka, Edward T, Charlie Guse, Thomas D, Jordan I, Mark S, Bengt K, Marc D, Al C, Jan W, Ero C, Eranmn, Mitchell S, Helmuth V, Michael M, Jeremy P, PVS78, Ross D, Sergey K, John Grover, Fahiz Y, George L.Z., Craig E, Sean S, Brad G, Dennis H, Camila C, Egor U, David T, Cameron W, Napoleon Hernandez, Keeshen A, Daniel E, Daniel H, M.Patterson, Asen K, Virgil J, Balazs Trader, Stan L, Con L, Will D, Scott K, Barry K, Pawel D, S Ray, Richard C, Peter L, Thomas L., Wang H, Oliver Lee, Christian L..
The most recent commit recorded on QuantConnect/Lean was 9 days ago, based on the GitHub push timestamp. The repository has 5.1k forks — one of the better signals of community interest.
How does QuantConnect/Lean compare to other Backend projects?
QuantConnect/Lean is tracked by TopGit in the Backend category, with 21.1k GitHub stars and written in C#. Browse the Backend topic page on TopGit to compare it against similar projects by stars and activity.
How many stars does QuantConnect/Lean have?
QuantConnect/Lean has 21.1k GitHub stars — refresh the page for the live number, or check github.com/QuantConnect/Lean. TopGit mirrors GitHub's count but does not claim minute-by-minute accuracy.
What is QuantConnect/Lean?
QuantConnect/Lean (QuantConnect/Lean) is a C# project on GitHub. From the project's own README: Lean Algorithmic Trading Engine by QuantConnect (Python, C#)
What language is QuantConnect/Lean written in?
QuantConnect/Lean is written primarily in C#. GitHub's language field is based on the largest share of bytes in the default branch.
Why is QuantConnect/Lean categorized under Backend?
TopGit places QuantConnect/Lean in the Backend category based on its GitHub topics and description (tagged: "algorithm", "algorithmic-trading-engine", "c-sharp"). Categories are assigned from real repository metadata, not editorial guesswork.
