Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-28 06:34 UTC

quantumlib / Cirq

Python framework for creating, editing, and running Noisy Intermediate-Scale Quantum (NISQ) circuits.

PythonApache-2.0★ 5,054 stars⑂ 1,262 forkssince Dec 2017View on GitHub ↗

quantumlib/Cirq holds a health index of 99 out of 100, placing it in the Exceptional band. It scores highest on Engineering Quality (94/100) and lowest on AI Readiness (65/100). It was last updated today. 6 contributors account for most of its recent work.

99
overall / 100
Exceptional

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

99
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 89 is calibrated to 99 on the published index scale (record calibration 2026-08-02).

Ownership

QuantumlibOrganization
1,426 followers17 public repossince Aug 2017

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
PyPIcirq1.7.070,6982,75859 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-aqt1.7.055,9182,39659 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-web1.7.057,7582,36159 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-core1.7.0382,9052,47659 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-ionq1.7.077,1932,38559 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-google1.7.090,2172,48059 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation
PyPIcirq-pasqal1.7.061,6422,36559 days agoalgorithmsapicirqgooglegoogle-quantumnisqpythonquantumquantum-algorithmsquantum-circuitquantum-circuit-simulatorquantum-computer-simulatorquantum-computingquantum-development-kitquantum-informationquantum-programmingquantum-programming-languagequantum-simulationsdksimulation

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

90Excellent · 21% of overall

Development activity

100Exceptional
How it's scored
36/36Push recencylast push 0 days ago
36/36Commit cadence52/52 weeks with commits
18/18Commit volume413 commits in the last year
10/10OpenSSF Scorecard: Maintained30 commit(s) and 14 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year413
human_commit_share0.98
days_since_last_push0
active_weeks_last_year52
How it's scored
27/27Ships releases31 releases published
36/36Release recencylatest release 58 days ago
12.6/27Release cadencea release every ~160.3 days
0/10OpenSSF Scorecard: Signed-ReleasesProject has not signed or included provenance with any releases.
Inputs used
releases_count31
latest_release_tagv1.7.0
releases_from_tagsno
days_since_latest_release58
mean_days_between_releases160.3

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

93Exceptional · 17% of overall
How it's scored
60/60Stars5,054 stars
25/25Forks1,262 forks
12.7/15Watchers190 watchers
Inputs used
forks1,262
stars5,054
watchers190
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized license (Apache-2.0)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges8
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesshields.io
has_pull_request_templateno
How it's scored
78.7/80Monthly downloads796,331 downloads/month across pypi
0/20Registry dependentsnot reported by this ecosystem
Inputs used
packagescirq, cirq-aqt, cirq-web, cirq-core, cirq-ionq, cirq-google, cirq-pasqal
dependents
ecosystemspypi
total_downloads
monthly_downloads796,331
unverified_packages_excluded
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

89Excellent · 23% of overall
How it's scored
48.6/54Bus factor6 contributor(s) cover half of all commits
19.8/22.5Commit distributiontop contributor authored 12% of commits
13.5/13.5Contributor breadth99 contributors
10/10OpenSSF Scorecard: Contributorsproject has 17 contributing companies or organizations
Inputs used
bus_factor6
contributors_sampled99
top_contributor_share0.12
How it's scored
40.6/42Issue resolution97% of issues closed
25.3/30PR acceptance4,846/5,744 decided PRs merged
10.4/13Newcomer PR acceptance4/5 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Reviewall changesets reviewed
Inputs used
merged_prs4,846
open_issues82
closed_issues2,409
prs_merged_7d6
prs_decided_7d7
prs_merged_30d44
prs_decided_30d49
issue_closed_ratio0.967
closed_unmerged_prs898
first_time_authors_30d4
first_time_prs_merged_30d4
first_time_prs_decided_30d5
How it's scored
30/30Ownership backingorganization-owned
0/20Verified domain
22.7/25Owner reach1,426 followers of quantumlib
21.1/25Track record17 public repos, account ~9 yr old
Inputs used
followers1,426
owner_typeOrganization
is_verifiedno
owner_loginquantumlib
public_repos17
account_age_days3,291

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable7 package(s) on pypi
35/35Publish recencylatest publish 59 days ago
20/20Version history2,758 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagescirq, cirq-aqt, cirq-web, cirq-core, cirq-ionq, cirq-google, cirq-pasqal
ecosystemspypi
any_deprecatedno
min_days_since_publish59

Engineering Quality

Are baseline engineering and documentation practices in place?

94Exceptional · 19% of overall
How it's scored
24/24CI workflows9 workflow(s)
24/24Tests present
16/16Linter configpyproject.toml ([tool.ruff], [tool.pylint], [tool.black], [tool.isort])
0/9.6Pre-commit hooks
6.4/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigyes
has_linter_configyes
has_precommit_configno

Documentation

100Exceptional
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage sitehttps://quantumai.google/cirq
10/10Repository description
10/10Topics20 topics
10/10Wiki
Inputs used
topicsnisq, quantum-algorithms, quantum-computing, cirq, algorithms, api, google-quantum, python, quantum, quantum-circuit, quantum-circuit-simulator, quantum-development-kit, quantum-information, quantum-programming, quantum-simulation, sdk, simulation, quantum-computer-simulator, quantum-programming-language, google
has_wikiyes
homepagehttps://quantumai.google/cirq
docs_sitehttps://quantumai.google/cirq
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

82Excellent · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
0/7.5Branch-Protectionno data
2.5/2.5CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
0.5/2.5CII-Best-Practicesbadge detected: InProgress
7.5/7.5Code-Reviewall changesets reviewed
2.5/2.5Contributorsproject has 17 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
7.5/7.5Dependency-Update-Toolupdate tool detected
5/5Fuzzingproject is fuzzed
2.5/2.5Licenselicense file detected
7.5/7.5Maintained30 commit(s) and 14 issue activity found in the last 90 days -- score normalized to 10
0/5Packagingno data
1.5/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 3
5/5SASTSAST tool is run on all commits
5/5Security-Policysecurity policy file detected
0/7.5Signed-ReleasesProject has not signed or included provenance with any releases.
7.5/7.5Token-PermissionsGitHub workflow tokens follow principle of least privilege
0/7.5Vulnerabilities15 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate7.8
Excluded from scoring (no data or not applicable): Branch-Protection, Packaging. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
25/25Indirect dependencies free of known advisoriesno indirect dependency carries a known advisory
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages45
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the pypi:cirq@1.7.0 runtime dependency closure — what installing the published package pulls in — 45 packages. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

65Good · 4% of overall
How it's scored
0/45Agent instructionsno CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
40/40Legible commit history97 of 98 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url
legible_history_share0.99
agent_instruction_files
agent_instruction_max_bytes
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format configpyproject.toml ([tool.ruff], [tool.pylint], [tool.black], [tool.isort])
11/11Static type checkingcirq-core/cirq/py.typed, cirq-google/cirq_google/cloud/quantum/py.typed, cirq-google/cirq_google/cloud/quantum_v1alpha1/py.typed, cirq-google/cirq_google/py.typed, cirq-web/cirq_web/tsconfig.json
10/10Reproducible environmentlockfile
0/10Demonstrated agent practiceno agent-authored commits among the last 100
8/8Automated maintenance2 of the last 100 commits are automated dependency updates
3/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 3
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageno
bootstrap_files
has_devcontainerno
has_linter_configyes
typecheck_configscirq-core/cirq/py.typed, cirq-google/cirq_google/cloud/quantum/py.typed, cirq-google/cirq_google/cloud/quantum_v1alpha1/py.typed, cirq-google/cirq_google/py.typed, cirq-web/cirq_web/tsconfig.json
agent_commit_share0
toolchain_manifests
dependency_bot_commit_share0.02
How it's scored
27/45Type-checkable codePython with type-check config (cirq-core/cirq/py.typed, cirq-google/cirq_google/cloud/quantum/py.typed, cirq-google/cirq_google/cloud/quantum_v1alpha1/py.typed, cirq-google/cirq_google/py.typed, cirq-web/cirq_web/tsconfig.json)
54.4/55Manageable file sizes14/1,233 source files over 60KB
Inputs used
primary_languagePython
largest_source_bytes272,328
source_files_sampled1,233
oversized_source_files14
How it's scored
40/40API schema (OpenAPI/GraphQL/proto)cirq-google/cirq_google/api/v1/operations.proto, cirq-google/cirq_google/api/v1/params.proto, cirq-google/cirq_google/api/v1/program.proto, cirq-google/cirq_google/api/v2/batch.proto, cirq-google/cirq_google/api/v2/calibration.proto, cirq-google/cirq_google/api/v2/device.proto, cirq-google/cirq_google/api/v2/metrics.proto, cirq-google/cirq_google/api/v2/ndarrays.proto, cirq-google/cirq_google/api/v2/program.proto, cirq-google/cirq_google/api/v2/result.proto, cirq-google/cirq_google/api/v2/run_context.proto
0/20MCP servernot applicable to this kind of software
40/40Runnable examplesexamples, notebooks
Inputs used
example_dirsexamples, notebooks
has_mcp_signalno
api_schema_filescirq-google/cirq_google/api/v1/operations.proto, cirq-google/cirq_google/api/v1/params.proto, cirq-google/cirq_google/api/v1/program.proto, cirq-google/cirq_google/api/v2/batch.proto, cirq-google/cirq_google/api/v2/calibration.proto, cirq-google/cirq_google/api/v2/device.proto, cirq-google/cirq_google/api/v2/metrics.proto, cirq-google/cirq_google/api/v2/ndarrays.proto, cirq-google/cirq_google/api/v2/program.proto, cirq-google/cirq_google/api/v2/result.proto, cirq-google/cirq_google/api/v2/run_context.proto
interfaces_expected_of
Excluded from scoring (no data or not applicable): MCP server. Remaining weights renormalized.

Key facts

5,054GitHub stars
99contributors
413commits, last 12 months
0days since last push
31releases
6bus factor
82open issues
PyPIpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • First-time contributor figures cover 12 of 16 authors (cap 12)

More detail

Star and fork history 0 ★ / 1,262 ⇿
0Stars
1,262Forks
26Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

Only the most recent history is shown — this repository exceeds the collection window, so the earliest history is not captured.

2004006008001,0001,2001,4001,262112019-092023-032026-08
Major 1Minor 17Patch 8

Each point covers 7 days.

OpenSSF Scorecard 7.8 / 10
7.8aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-28 06:33 UTC

10Binary-Artifactsno binaries found in the repo
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
10CI-Tests30 out of 30 merged PRs checked by a CI test -- score normalized to 10
2CII-Best-Practicesbadge detected: InProgress
10Code-Reviewall changesets reviewed
10Contributorsproject has 17 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
10Fuzzingproject is fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 14 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
3Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 3
10SASTSAST tool is run on all commits
10Security-Policysecurity policy file detected
0Signed-ReleasesProject has not signed or included provenance with any releases.
10Token-PermissionsGitHub workflow tokens follow principle of least privilege
0Vulnerabilities15 existing vulnerabilities detected
All dependencies 564

Full resolved dependency set from the GitHub dependency graph: 0 direct and 564 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

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npmy18n5.0.8indirect
npmyallist4.0.0indirect
npmyargs17.7.2indirect
npmyargs-parser20.2.9indirect
npmyargs-parser21.1.1indirect
npmyauzl2.10.0indirect
npmyocto-queue0.1.0indirect
npmzod3.25.76indirect
PyPI3to2indirect
PyPIa-dependency0.2.3indirect
PyPIabsl-pyindirect
PyPIattrsindirect
PyPIbindirect
PyPIblack26.5.1indirect
PyPIcindirect
PyPIcodeownersindirect
PyPIcoverageindirect
PyPIduetindirect
PyPIfilelockindirect
PyPIgoogle-api-coreindirect
PyPIgoogle-api-python-clientindirect
PyPIgrpcio-toolsindirect
PyPIipykernelindirect
PyPIipythonindirect
PyPIisortindirect
PyPIlatexmkindirect
PyPImatplotlibindirect
PyPImockindirect
PyPImypyindirect
PyPImypy2.1.0indirect
PyPImypy-protobufindirect
PyPInetworkxindirect
PyPInotebookindirect
PyPInumpyindirect
PyPIopt-einsumindirect
PyPIpandasindirect
PyPIpapermillindirect
PyPIplyindirect
PyPIproto-plusindirect
PyPIprotobufindirect
PyPIprotobuf-compilerindirect
PyPIpylatexindirect
PyPIpylintindirect
PyPIpytestindirect
PyPIpytest-asyncioindirect
PyPIpytest-benchmarkindirect
PyPIpytest-covindirect
PyPIpytest-randomlyindirect
PyPIpytest-xdistindirect
PyPIpython3-tkindirect
PyPIqiskit-aerindirect
PyPIquimbindirect
PyPIrecommonmarkindirect
PyPIreq1indirect
PyPIreq2indirect
PyPIrequestsindirect
PyPIruff0.15.15indirect
PyPIscipyindirect
PyPIseabornindirect
PyPIsetuptoolsindirect
PyPIsortedcontainersindirect
PyPIsphinxindirect
PyPIsphinx-rtd-themeindirect
PyPIstimcirqindirect
PyPIsympyindirect
PyPItensorflow-docs2025.2.19.33219indirect
PyPItexlive-latex-baseindirect
PyPItexlive-latex-extraindirect
PyPItqdmindirect
PyPItwineindirect
PyPItypedunitsindirect
PyPItypes-protobufindirect
PyPItypes-requestsindirect
PyPItypingindirect
PyPItyping-extensionsindirect
PyPIvirtualenvindirect
PyPIvirtualenv-cloneindirect
PyPIvirtualenvwrapperindirect
PyPIwheelindirect
Dependency advisories 0

Installing pypi:cirq@1.7.0 pulls in 45 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.

No known advisories affect the assessed dependencies.

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statisticsPyPI.