# klee/klee

KLEE Symbolic Execution Engine

Repository: https://github.com/klee/klee
Canonical: https://ross.abutalabs.com/products/klee
Homepage: https://klee-se.org/
Language: C++
License: NOASSERTION
License Family: other
Topics: symbolic-execution, klee
Last push: 2026-08-21T13:27:24+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 30, longevity 100
- inputs: {"age_days": 4791, "days_push": 12, "days_rel": 253, "gap_med": null, "n_releases_24m": 1}
- 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 2974, forks 736 (observed 2026-08-28T04:07:32.836635+00:00)

## What it is
KLEE is a dynamic symbolic execution engine and symbolic virtual machine built on LLVM, which executes programs with symbolic inputs to automatically generate high-coverage test cases and find bugs. It includes a POSIX/Linux emulation layer, constraint solving, and auxiliary tools for replaying and analyzing generated test inputs.

## Use cases
- automatically generate high-coverage test cases for C programs
- find memory corruption and integer overflow bugs in C/C++ code
- symbolically execute LLVM bitcode to explore program paths
- test GNU coreutils-style command-line programs with symbolic arguments and files
- verify program properties using constraint solving
- research on symbolic execution and program analysis

## When to choose
- you need automated test generation or bug finding for C/C++ programs compiled to LLVM bitcode
- you want to explore many execution paths without writing concrete inputs
- you are doing academic research on symbolic execution
- you need to test programs with symbolic files, arguments, or environment variables

## When to avoid
- you need to test interpreted or managed languages not compiled to LLVM bitcode
- you want lightweight fuzzing without constraint solving overhead
- your codebase cannot be compiled with clang/LLVM
- you need Windows-native execution support

## Facets
- artifact type: cli-tool
- maturity: active
- function: testing, fuzzing, interpreter, developer-tools
- domain: testing, developer-tools
- platform: cpp, bsd
- tags: symbolic-execution, llvm, smt-solver, program-analysis, test-generation, formal-verification, algorithms, linux, macos, docker

## Member repositories
- klee/klee (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:32.836635+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 2026-08-30T07:31:35.850664+00:00, confidence not recorded.
  - readme: https://github.com/klee/klee (fetched 2026-08-28T04:07:32.836635+00:00, sha 69810a94538b)
  - homepage: https://klee-se.org/ (fetched 2026-08-29T09:46:56.628868+00:00, sha 22ea8b80d421)
  - site_page: https://klee-se.org/getting-started (fetched 2026-08-29T09:46:56.637836+00:00, sha f835acaded24)
  - site_page: https://klee-se.org/docs (fetched 2026-08-29T09:46:56.639578+00:00, sha 900e5c0472dc)
  - site_page: https://klee-se.org/docs/intrinsics (fetched 2026-08-29T09:46:56.643071+00:00, sha f379ff40919a)
  - site_page: https://klee-se.org/docs/options (fetched 2026-08-29T09:46:56.644875+00:00, sha a9077b2991aa)
  - site_page: https://klee-se.org/docs/tools (fetched 2026-08-29T09:46:56.646900+00:00, sha ed6b5800d64e)
  - site_page: https://klee-se.org/docs/developers-guide (fetched 2026-08-29T09:46:56.653681+00:00, sha 273b74d9ac2d)
  - site_page: https://klee-se.org/releases (fetched 2026-08-29T09:46:56.641402+00:00, sha 75c7e9a72a1c)
  - site_page: https://klee-se.org/publications (fetched 2026-08-29T09:46:56.649550+00:00, sha 827336dd5530)
- Data as of 2026-08-30T08:39:29.467469+00:00.