# dealii/dealii

The development repository for the deal.II finite element library

Repository: https://github.com/dealii/dealii
Canonical: https://ross.abutalabs.com/products/dealii
Homepage: https://dealii.org
Language: C++
License: NOASSERTION
License Family: other
Topics: finite-elements, c-plus-plus, fem, hpc, parallel-computing, scientific-computing, kokkos
Last push: 2026-08-26T19:09:27+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 72, longevity 100
- inputs: {"age_days": 4430, "days_push": 7, "days_rel": 24, "gap_med": 132.5, "n_releases_24m": 5}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1715, forks 864 (observed 2026-08-28T04:05:26.227007+00:00)

## What it is
deal.II is a C++ library for solving partial differential equations using adaptive finite elements, with support for dimension-independent code, parallel computing (MPI, GPU via Kokkos), and extensive tutorials. It is a mature, widely used academic and commercial project with regular releases and comprehensive documentation.

## Use cases
- solve PDEs with adaptive finite elements in C++
- build a parallel finite element solver for supercomputers
- simulate heat equation or elasticity on adaptive meshes
- run GPU-accelerated FEM simulations with Kokkos
- learn finite element methods through tutorial programs
- solve Helmholtz or magnetostatic curl-curl problems
- implement discontinuous Galerkin solvers on polytopal meshes

## When to choose
- you need a production-quality, well-documented FEM library in C++
- you need to scale finite element solvers from laptops to supercomputers
- you want dimension-independent code and adaptive mesh refinement out of the box
- you need GPU acceleration for FEM via Kokkos

## When to avoid
- you need a quick scripting-language PDE tool rather than a C++ library
- your problem is not suited to finite element discretization
- you need a turnkey application rather than a library you program against

## Facets
- artifact type: library
- maturity: stable
- function: simulation, math, graphics, developer-tools
- domain: simulation, performance, gpu-computing, education
- platform: windows, cpp, cross-platform
- tags: finite-elements, pde-solver, hpc, scientific-computing, adaptive-mesh-refinement, mpi, kokkos, numerical-methods, algorithms, linux, macos, gpu

## Member repositories
- dealii/dealii (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:26.227007+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:34:17.899950+00:00, confidence not recorded.
  - readme: https://github.com/dealii/dealii (fetched 2026-08-28T04:05:26.227007+00:00, sha 670ddf6ba090)
  - homepage: https://dealii.org (fetched 2026-08-29T11:10:37.187144+00:00, sha a9d0824cb899)
  - site_page: https://dealii.org/about (fetched 2026-08-29T11:10:37.189710+00:00, sha 3220c90acfbe)
  - site_page: https://dealii.org/about/news (fetched 2026-08-29T11:10:37.191750+00:00, sha ac983e077836)
  - site_page: https://dealii.org/about/funding (fetched 2026-08-29T11:10:37.194345+00:00, sha b1478d8479be)
  - site_page: https://dealii.org/current/doxygen/deal.II (fetched 2026-08-29T11:10:37.196149+00:00, sha c62f0bf3c221)
  - site_page: https://dealii.org/current_release/older_releases (fetched 2026-08-29T11:10:37.198235+00:00, sha 7c407dbb9a08)
  - site_page: https://dealii.org/developer/doxygen/deal.II (fetched 2026-08-29T11:10:37.199712+00:00, sha 871fa438be4e)
- Data as of 2026-08-30T08:39:29.467469+00:00.