generated: '2026-08-25'
method: searched
source: >-
  github.com/Metalenz, the Julia General registry (JuliaRegistries/General), npm, PyPI, RubyGems,
  crates.io and the metalenz.com site search
description: >-
  Metalenz publishes no API client library, in any language, for any of its surfaces — there is no
  developer program to build one against. It does publish three public repositories in its own
  GitHub organization, github.com/Metalenz, and one of them is a registered Julia package. These
  are internal scientific-computing tools from the metasurface inverse-design team, not SDKs.
  Ownership is not inferred: both registered packages carry Metalenz corporate email addresses in
  their Project.toml `authors` field (sam@metalenz.com, pawel@metalenz.com — Sam Buercklin,
  research software engineer, and Pawel Latawiec, CTO). No `SDKs` pointer is emitted in apis.yml,
  because none of these wraps an API and emitting one would credit Metalenz with a client library
  it does not ship.
sdk_count: 0
package_count: 2
packages:
- language: julia
  registry: julia-general
  name: FlexibleFunctors
  url: https://github.com/Metalenz/FlexibleFunctors.jl
  registry_url: https://juliahub.com/ui/Packages/General/FlexibleFunctors
  install: 'using Pkg; Pkg.add("FlexibleFunctors")'
  official: true
  is_api_client: false
  version: 0.1.6
  published: '2021-07-19'
  description: >-
    Converts struct fields to a flat vector representation and back, with a `parameters(x)` hook
    that dynamically decides which fields are free and which are fixed. This is the shape an
    inverse-design / gradient-optimization loop needs, and it is used with Zygote in the README —
    consistent with metasurface inverse design, which is Metalenz's core numerical problem.
  note: >-
    Registered in the Julia General registry (F/FlexibleFunctors/Package.toml points at
    github.com/Metalenz/FlexibleFunctors.jl); three versions registered, 0.1.4 through 0.1.6.
    Latest tag v0.1.6 dates to 2021-07-19 — five years stale at capture, and the repository has
    had no push since. Treat as unmaintained.
- language: julia
  registry: null
  name: InfiltrateRRule
  url: https://github.com/Metalenz/InfiltrateRRule.jl
  registry_url: null
  install: 'using Pkg; Pkg.add(url="https://github.com/Metalenz/InfiltrateRRule.jl")'
  official: true
  is_api_client: false
  version: null
  published: null
  description: >-
    Adds `@infiltrate` breakpoints to automatically derived ChainRules rrules — an autodiff
    debugging aid.
  note: >-
    Checked and absent from the Julia General registry (I/InfiltrateRRule returns 404), so there is
    no registry metadata endpoint to read a published version or date from. Project.toml declares
    version 0.1.1 and the repository carries no git tags; last commit 2021-10-29. version/published
    are null because there is nothing published to record, not because they were not checked.
excluded:
- name: Devices.jl
  url: https://github.com/Metalenz/Devices.jl
  reason: >-
    A fork of platawiec/Devices.jl (itself from PainterQubits/Devices.jl) — CAD for superconducting
    microwave devices. Not first-party work and not a Metalenz product; recorded here so the
    omission reads as deliberate.
registries_checked:
- registry: npm
  query: metalenz, "@metalenz/sdk"
  result: 404 — no package
- registry: pypi
  query: metalenz
  result: 404 — no package
- registry: rubygems
  query: metalenz
  result: 404 — no package
- registry: crates.io
  query: metalenz
  result: 404 — no package
- registry: julia-general
  query: FlexibleFunctors, InfiltrateRRule
  result: FlexibleFunctors registered (0.1.6); InfiltrateRRule absent
evidence:
- url: https://api.github.com/orgs/Metalenz/repos
  http_status: 200
  finding: 3 public repositories; 2 first-party Julia packages, 1 fork.
- url: https://raw.githubusercontent.com/Metalenz/FlexibleFunctors.jl/master/Project.toml
  http_status: 200
  finding: 'authors = ["Sam Buercklin <sam@metalenz.com>", "Pawel Latawiec <pawel@metalenz.com>"]; version = "0.1.6" — corporate-domain authorship confirms org ownership.'
- url: https://raw.githubusercontent.com/JuliaRegistries/General/master/F/FlexibleFunctors/Package.toml
  http_status: 200
  finding: 'repo = "https://github.com/Metalenz/FlexibleFunctors.jl.git" — registered in the Julia General registry.'
- url: https://raw.githubusercontent.com/JuliaRegistries/General/master/I/InfiltrateRRule/Package.toml
  http_status: 404
  finding: Not registered.
- url: https://github.com/Metalenz/FlexibleFunctors.jl/tags.atom
  http_status: 200
  finding: 'Latest tag v0.1.6, 2021-07-19T16:43:17Z.'