Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-20 07:20 UTC

flexcompute / tidy3d

fast, large scale photonic simulation platform

PythonLGPL-2.1★ 364 stars⑂ 84 forkssince Aug 2021View on GitHub ↗
KindCommand-line toolMCP serverLibraryhow this is determined
#python#fdtd#electromagnetics#simulation#xarray#pydantic

flexcompute/tidy3d holds a health index of 91 out of 100, placing it in the Excellent band. It scores highest on Engineering Quality (92/100) and lowest on AI Readiness (59/100). It was last updated 43 days ago. 3 contributors account for most of its recent work.

91
overall / 100
Excellent

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.

91
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 77 is calibrated to 91 on the published index scale (record calibration 2026-08-02).

Ownership

Flexcompute, IncOrganization
136 followers45 public repossince Nov 2017

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
PyPItidy3d2.12.069,4379454 days ago

Metrics by category

Vitality

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

86Excellent · 21% of overall

Development activity

77Good
How it's scored
18/36Push recency — last push 43 days ago
31.2/36Commit cadence — 45/52 weeks with commits
18/18Commit volume — 708 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year708
human_commit_share0.98
days_since_last_push43
active_weeks_last_year45

Release discipline

100Exceptional
How it's scored
27/27Ships releases — 100 releases published
36/36Release recency — latest release 54 days ago
27/27Release cadence — a release every ~15.9 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count100
latest_release_tagv2.12.0
releases_from_tagsno
days_since_latest_release54
mean_days_between_releases15.9
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

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

63Moderate · 17% of overall

Popularity & adoption

63Moderate
How it's scored
41.5/60Stars — 364 stars
16/25Forks — 84 forks
5.6/15Watchers — 11 watchers
Inputs used
forks84
stars364
watchers11
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

50Moderate
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (LGPL-2.1)
0/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges8
has_contributingno
has_issue_templateno
has_code_of_conductno
readme_badge_servicesshields.io
has_pull_request_templateno

Ecosystem adoption (downloads)

81Excellent
How it's scored
64.6/80Monthly downloads — 69,437 downloads/month across pypi
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagestidy3d
dependents—
ecosystemspypi
total_downloads—
monthly_downloads69,437
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?

79Good · 23% of overall

Maintainer resilience (bus factor)

76Good
How it's scored
36/54Bus factor — 3 contributor(s) cover half of all commits
16.2/22.5Commit distribution — top contributor authored 28% of commits
13.5/13.5Contributor breadth — 60 contributors
10/10OpenSSF Scorecard: Contributors — project has 4 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled60
top_contributor_share0.279

Issue & PR responsiveness

73Good
How it's scored
37.5/42Issue resolution — 89% of issues closed
24.9/30PR acceptance — 2,115/2,544 decided PRs merged
0/13Newcomer PR acceptance — no first-time contributor's PR decided in 30d
1.5/15OpenSSF Scorecard: Code-Review — Found 3/30 approved changesets -- score normalized to 1
Inputs used
merged_prs2,115
open_issues84
closed_issues695
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.892
closed_unmerged_prs429
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.

Ownership & stewardship

70Good
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain
15.4/25Owner reach — 136 followers of flexcompute
24.1/25Track record — 45 public repos, account ~8 yr old
Inputs used
followers136
owner_typeOrganization
is_verifiedno
owner_loginflexcompute
public_repos45
account_age_days3,243

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 1 package(s) on pypi
35/35Publish recency — latest publish 54 days ago
20/20Version history — 94 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagestidy3d
ecosystemspypi
any_deprecatedno
min_days_since_publish54

Engineering Quality

Are baseline engineering and documentation practices in place?

92Excellent · 19% of overall

Engineering practices

86Excellent
How it's scored
24/24CI workflows — 1 workflow(s)
24/24Tests present
16/16Linter config — pyproject.toml ([tool.ruff])
9.6/9.6Pre-commit hooks
0/6.4.editorconfig
12/20OpenSSF Scorecard: CI-Tests — 2 out of 3 merged PRs checked by a CI test -- score normalized to 6
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configyes

Documentation

100Exceptional
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage site — https://docs.flexcompute.com/projects/tidy3d/en/latest/
10/10Repository description
10/10Topics — 6 topics
10/10Wiki
Inputs used
topicspython, fdtd, electromagnetics, simulation, xarray, pydantic
has_wikiyes
homepagehttps://docs.flexcompute.com/projects/tidy3d/en/latest/
docs_sitehttps://docs.flexcompute.com/projects/tidy3d/en/latest/
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

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

62Moderate · 16% of overall

Security posture

53Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
3.8/7.5Branch-Protection — branch protection is not maximal on development and all release branches
1.5/2.5CI-Tests — 2 out of 3 merged PRs checked by a CI test -- score normalized to 6
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
0.8/7.5Code-Review — Found 3/30 approved changesets -- score normalized to 1
2.5/2.5Contributors — project has 4 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
2.5/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 5
3/5SAST — SAST tool is not run on all commits -- score normalized to 6
0/5Security-Policy — security policy file not detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5Vulnerabilities — 40 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate5.3
Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages106
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:tidy3d@2.12.0 runtime dependency closure — what installing the published package pulls in — 106 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.

59Moderate · 4% of overall

Agent context & guidance

85Excellent
How it's scored
45/45Agent instructions — AGENTS.md, CLAUDE.md
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 98 of 98 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share1
agent_instruction_filesAGENTS.md, CLAUDE.md
agent_instruction_max_bytes6,955

Verify loop (build / test / typecheck)

52Moderate
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format config — pyproject.toml ([tool.ruff])
0/11Static type checking
10/10Reproducible environment — lockfile
4/10Demonstrated agent practice — 2 of the last 100 commits agent-authored or agent-credited
0/8Automated maintenance — no automated dependency updates observed
5/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 5
Inputs used
has_nixno
has_testsyes
lockfilesuv.lock
has_dockerfileno
typed_languageno
bootstrap_files—
has_devcontainerno
has_linter_configyes
typecheck_configs—
agent_commit_share0.02
toolchain_manifests—
dependency_bot_commit_share0

Code legibility for models

52Moderate
How it's scored
0/45Type-checkable code — Python without a type-check config
51.7/55Manageable file sizes — 41/685 source files over 60KB
Inputs used
primary_languagePython
largest_source_bytes360,277
source_files_sampled685
oversized_source_files41

Machine-readable interfaces

33At Risk
How it's scored
0/40API schema (OpenAPI/GraphQL/proto) — not applicable to this kind of software
20/20MCP server
0/40Runnable examples
Inputs used
example_dirs—
has_mcp_signalyes
api_schema_files—
interfaces_expected_of—
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto). Remaining weights renormalized.

Key facts

364GitHub stars
60contributors
708commits, last 12 months
43days since last push
100releases
3bus factor
84open issues
PyPIpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token

More detail

Star and fork history 0 ★ / 84 ⇿
0Stars
84Forks
100Releases

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.

0204060801008442022-022024-052026-08
Major 0Minor 19Patch 55

Each point covers 5 days.

OpenSSF Scorecard 5.3 / 10
5.3aggregate

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 · 2026-09-20 07:19 UTC

10Binary-Artifactsno binaries found in the repo
5Branch-Protectionbranch protection is not maximal on development and all release branches
6CI-Tests2 out of 3 merged PRs checked by a CI test -- score normalized to 6
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
1Code-ReviewFound 3/30 approved changesets -- score normalized to 1
10Contributorsproject has 4 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 5
6SASTSAST tool is not run on all commits -- score normalized to 6
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0Vulnerabilities40 existing vulnerabilities detected
Direct dependencies 29
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All dependencies 330

Full resolved dependency set from the GitHub dependency graph: 34 direct and 296 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

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PyPIpyswarms1.3.0indirect
PyPIpytest9.1.1indirect
PyPIpytest-cov7.1.0indirect
PyPIpytest-env1.6.0indirect
PyPIpytest-testmon2.2.0indirect
PyPIpytest-timeout2.4.0indirect
PyPIpytest-xdist3.8.0indirect
PyPIpython-dateutil2.9.0.post0indirect
PyPIpython-discovery1.4.4indirect
PyPIpython-dotenv1.2.2indirect
PyPIpython-json-logger4.1.0indirect
PyPIpython-multipart0.0.32indirect
PyPIpytz2026.2indirect
PyPIpyvista0.47.3indirect
PyPIpyviz-comms3.0.6indirect
PyPIpywin32312indirect
PyPIpywin32-ctypes0.2.3indirect
PyPIpywinpty3.0.5indirect
PyPIpyyaml-ft8.0.0indirect
PyPIpyzmq27.1.0indirect
PyPIreferencing0.37.0indirect
PyPIrfc3339-validator0.1.4indirect
PyPIrfc3986-validator0.1.1indirect
PyPIrfc3987-syntax1.1.0indirect
PyPIrich-rst2.1.0indirect
PyPIroman-numerals4.1.0indirect
PyPIroman-numerals-py4.1.0indirect
PyPIrpds-py0.30.0indirect
PyPIrpds-py2026.6.3indirect
PyPIrtree1.4.1indirect
PyPIruff0.14.1indirect
PyPIs3transfer0.19.1indirect
PyPIscikit-learn1.7.2indirect
PyPIscikit-learn1.9.0indirect
PyPIscikit-rf2.0.1indirect
PyPIscooby0.11.2indirect
PyPIsecretstorage3.5.0indirect
PyPIsend2trash2.1.0indirect
PyPIsetuptools83.0.0indirect
PyPIsignac2.4.0indirect
PyPIsimpervisor1.0.0indirect
PyPIsix1.17.0indirect
PyPIsmmap5.0.3indirect
PyPIsnowballstemmer3.1.1indirect
PyPIsoupsieve2.8.4indirect
PyPIsphinx8.1.3indirect
PyPIsphinx8.2.3indirect
PyPIsphinx-book-theme1.1.3indirect
PyPIsphinx-copybutton0.5.2indirect
PyPIsphinx-design0.6.1indirect
PyPIsphinx-favicon1.1.0indirect
PyPIsphinx-last-updated-by-git0.3.8indirect
PyPIsphinx-notfound-page1.1.0indirect
PyPIsphinx-sitemap2.9.0indirect
PyPIsphinx-tabs3.5.0indirect
PyPIsphinxcontrib-applehelp2.0.0indirect
PyPIsphinxcontrib-devhelp2.0.0indirect
PyPIsphinxcontrib-htmlhelp2.1.0indirect
PyPIsphinxcontrib-jsmath1.0.1indirect
PyPIsphinxcontrib-qthelp2.0.0indirect
PyPIsphinxcontrib-serializinghtml2.0.0indirect
PyPIsphinxemoji0.3.2indirect
PyPIsse-starlette3.4.5indirect
PyPIstack-data0.6.3indirect
PyPIstarlette1.3.1indirect
PyPIsympy1.14.0indirect
PyPIsynced-collections1.0.1indirect
PyPIterminado0.18.1indirect
PyPIthreadpoolctl3.6.0indirect
PyPItidy3d2.12.0.dev3indirect
PyPItidy3d-extras2.12.0.dev3indirect
PyPItinycss21.5.1indirect
PyPItmm0.2.0indirect
PyPItomli2.4.1indirect
PyPItomli-w1.2.0indirect
PyPItoolz1.1.0indirect
PyPItorch2.13.0indirect
PyPItorch2.13.0+cpuindirect
PyPItornado6.5.7indirect
PyPItowncrier25.8.0indirect
PyPItox4.56.4indirect
PyPItqdm4.68.4indirect
PyPItraitlets5.15.1indirect
PyPItrame3.13.2indirect
PyPItrame-client3.13.2indirect
PyPItrame-common1.2.4indirect
PyPItrame-server3.12.5indirect
PyPItrame-vtk2.10.2indirect
PyPItrame-vuetify3.2.2indirect
PyPItrimesh4.12.2indirect
PyPItyping-inspection0.4.2indirect
PyPItzdata2026.3indirect
PyPIuc-micro-py2.0.0indirect
PyPIuncalled-for0.3.2indirect
PyPIuri-template1.3.0indirect
PyPIurllib32.7.0indirect
PyPIuvicorn0.51.0indirect
PyPIvirtualenv21.6.1indirect
PyPIvtk9.6.2indirect
PyPIwatchfiles1.2.0indirect
PyPIwcwidth0.8.2indirect
PyPIwebcolors25.10.0indirect
PyPIwebencodings0.5.1indirect
PyPIwebsocket-client1.9.0indirect
PyPIwebsockets16.1indirect
PyPIwidgetsnbextension4.0.15indirect
PyPIwslink2.5.7indirect
PyPIxyzservices2026.3.0indirect
PyPIyarl1.24.2indirect
PyPIzipp4.1.0indirect
PyPIzizmor1.26.1indirect
Dependency advisories 0

Installing pypi:tidy3d@2.12.0 pulls in 106 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.

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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 statistics — PyPI.