{"adoption": {"forks": 387, "observed_at": "2026-08-28T04:07:18.489327+00:00", "stars": 2761}, "canonical_url": "https://ross.abutalabs.com/products/stan", "card": {"archived": false, "artifact_type": "library", "description": "Stan development repository. The master branch contains the current release. The develop branch contains the latest stable development.  See the Developer Process Wiki for details.  ", "domain": ["machine-learning", "data-science"], "enriched": true, "function": ["machine-learning", "data-science", "math", "simulation"], "health_score": 99, "homepage": "https://mc-stan.org", "language": "C++", "license": "BSD-3-Clause", "license_family": "permissive", "maturity": "stable", "member_repos": ["stan-dev/stan", "stan-dev/rstan"], "name": "Stan", "platform": ["cross-platform", "cpp", "python", "jvm", "cli"], "pushed_at": "2026-08-26T07:16:50+00:00", "repo": "stan-dev/stan", "stars": 2761, "tags": ["bayesian-inference", "probabilistic-programming", "mcmc", "hamiltonian-monte-carlo", "variational-inference", "automatic-differentiation", "statistical-modeling", "statistics"], "topics": ["stan", "bayesian-inference", "bayesian", "bayesian-methods", "bayesian-statistics", "bayesian-data-analysis"], "urls": [{"kind": "homepage", "url": "https://mc-stan.org"}, {"kind": "site_page", "url": "https://mc-stan.org/about/index.html"}, {"kind": "site_page", "url": "https://mc-stan.org/install"}, {"kind": "site_page", "url": "https://mc-stan.org/docs"}, {"kind": "site_page", "url": "https://mc-stan.org/install/index.html"}], "use_cases": ["fit bayesian hierarchical models to data", "run MCMC sampling on a custom statistical model", "do variational inference for approximate posteriors", "estimate model parameters with maximum likelihood", "write probabilistic models in a declarative modeling language", "fit time-series or multilevel regression models"], "what_it_is": "Stan is a C++ probabilistic programming library for full Bayesian inference via NUTS/Hamiltonian Monte Carlo, approximate inference via ADVI, and penalized maximum likelihood via L-BFGS. It is built on the Stan Math automatic differentiation library and offers interfaces from R, Python, Julia, and the command line.", "when_to_avoid": ["you only need simple frequentist regression available in base statistical packages", "you cannot install a C++17 toolchain", "you need deep learning or GPU-heavy neural network training rather than statistical inference", "you want a pure-Python or pure-R solution without compiled dependencies"], "when_to_choose": ["you need full Bayesian posterior inference with state-of-the-art HMC sampling", "you want a mature, well-documented probabilistic programming language with multi-language interfaces", "you need automatic differentiation for custom statistical models", "you are doing academic or production statistical modeling in R, Python, or Julia"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/repos/stan-dev/stan", "repo": "stan-dev/stan", "role": "main", "score": 86}, {"path": "/repos/stan-dev/rstan", "repo": "stan-dev/rstan", "role": "sdk", "score": 68}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:07:18.489327+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T08:18:43.544036+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "b801044ae27cb1115d23629d6834aba0946db777b40e4f60db74ae9b2a934f25", "fetched_at": "2026-08-28T04:07:18.489327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/stan-dev/stan"}, {"content_hash": "33b57b308ead683b8568c2e5bfc519472a471b66b88a1933464f8efdee920954", "fetched_at": "2026-08-29T09:56:31.323185+00:00", "kind": "homepage", "missing": false, "url": "https://mc-stan.org"}, {"content_hash": "d053f2da70dfde666c8af13abd7755e4cc8b1cfd93287b8c30239db06856e46d", "fetched_at": "2026-08-29T09:56:31.336658+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/about/index.html"}, {"content_hash": "8a7aa0503c4527fa83ba427bf15fbb24cb9bd6956a5f06a0ce9f53e055590019", "fetched_at": "2026-08-29T09:56:31.338654+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install"}, {"content_hash": "7c4223856da86f549e7b342d50812d2746f67ef6d8cfcdade6bbb04f46e82652", "fetched_at": "2026-08-29T09:56:31.334886+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/docs"}, {"content_hash": "c79971f04c713816d7aea06a0bf86aad5c02779ffadd17046f41bad2e98f1c07", "fetched_at": "2026-08-29T09:56:31.332583+00:00", "kind": "site_page", "missing": false, "url": "https://mc-stan.org/install/index.html"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 99, "longevity": 100, "rhythm": 60}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4956, "days_push": 7, "days_rel": 106, "gap_med": 132, "n_releases_24m": 4}, "score": 86, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}