Project Summary
Thousands of users rely on Stan for statistical modeling, data analysis, and prediction in the social, biological, and physical sciences, engineering, and business.
Users specify log density functions in Stan’s probabilistic programming language and get:
full Bayesian statistical inference with MCMC sampling (NUTS, HMC)
approximate Bayesian inference with variational inference (ADVI)
penalized maximum likelihood estimation with optimization (L-BFGS)
Stan’s math library provides differentiable probability functions & linear algebra (C++ autodiff).
In a Nutshell, stan...
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has a well established, mature codebase
maintained by a large development team
with decreasing Y-O-Y commits -
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took an estimated 30 years of effort (COCOMO model)
starting with its first commit in September, 2011
ending with its most recent commit 4 days ago
Quick Reference
BSD 3-clause "New" or "Revised" License
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These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
Did You Know...
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in 2016, 47% of companies did not have formal process in place to track OS code
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nearly 1 in 3 companies have no process for identifying, tracking, or remediating known open source vulnerabilities
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data presented on the Open Hub is available through our API
30 Day SummaryJul 5 2026 — Aug 4 2026
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12 Month SummaryAug 4 2025 — Aug 4 2026
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