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QuantConnect /Lean

Lean Algorithmic Trading Engine by QuantConnect (Python, C#)

algorithmalgorithmic-trading-enginec-sharpfinanceforexlean-engineoptionspython
Open on GitHub Website#25 in C#
Stars22,391
Forks5,382
Open issues297
Avg. stars / day5faster than 20% of C#
LanguageC#
LicenseApache-2.0
CreatedNov 28, 2014
Last activityNov 4, 2026

Momentum

starts with the second daily update

Repocharts records a data point every day. Growth figures appear from tomorrow on.

Stars over time

tracked daily since Nov 5, 2026

22,391 stars today. This graph fills in as daily data points come in.

Chart positions

November 5, 2026
ChartRankPrev.PeakDays on chartAt this rank
C##25 ·–#2511 day

Rank history

last 90 days, #1 at the top

The rank history appears after the second daily update.

Compared with the C# chart

bar = this repo, line = chart median
Stars22.4k1.0× median
Forks5.4k1.8× median
Avg. stars per day570% of median
Open issues2971.3× median

Commit activity

last 52 weeks

Commit activity is fetched once a week and appears here after the next update.

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Cite and share

According to Repocharts, QuantConnect/Lean ranks #25 in the C# ranking on November 5, 2026.