Polymer
Our original Web Component library. observed · 2026-08-28
Health v2 · maintenance only
57/100
- Activity 75
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5123
- days_rel: 695
- days_push: 153
- n_releases_24m: 1
Adoption not part of the score
22017 stars · 1959 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Polymer is Google's original library for building encapsulated, reusable Web Components that work like standard HTML elements, with features for custom elements, Shadow DOM styling, data binding, and events. The library is now in maintenance mode, with Lit (LitElement) recommended as its successor for new development.
Use cases
- build reusable web components
- create custom HTML elements with shadow DOM
- maintain a legacy Polymer 2.x codebase
- migrate an older Polymer app to Polymer 3.0 modules
- share UI components across frameworks via web components
- learn how web components and data binding work
When to choose
- you maintain an existing Polymer-based application and need compatibility updates
- you want standards-based Web Components with data binding and legacy element support
- you need to incrementally migrate Polymer elements toward LitElement
When to avoid
- you are starting a new project - use Lit (LitElement) instead
- you want a component library with a large active ecosystem and frequent updates
- you need framework features like routing or state management beyond component building
Facets
library · maturity maintenance
frontend-framework ui-components templating state-management web-development frontend developer-tools browser web-components custom-elements shadow-dom data-binding polyfills lit-element-successor javascript nodejs
10 sources
- readme: https://github.com/Polymer/polymer · fetched 2026-08-28 · 0af7a30eca1e
- homepage: https://polymer-library.polymer-project.org/ · fetched 2026-08-29 · b1561606db3d
- site_page: https://polymer-library.polymer-project.org/3.0/docs/quick-tour · fetched 2026-08-29 · 24962fb8f1a4
- site_page: https://polymer-library.polymer-project.org/3.0/docs/install-3-0 · fetched 2026-08-29 · 84dc514f1bf7
- site_page: https://polymer-library.polymer-project.org/3.0/docs/first-element/intro · fetched 2026-08-29 · 4ddffa9ff93a
- site_page: https://polymer-library.polymer-project.org/3.0/docs/first-element/step-2 · fetched 2026-08-29 · 2c44ad99def2
- site_page: https://polymer-library.polymer-project.org/3.0/docs/first-element/step-3 · fetched 2026-08-29 · 4aeb9c067fc3
- site_page: https://polymer-library.polymer-project.org/3.0/docs/first-element/step-4 · fetched 2026-08-29 · 3a173b28ce64
- site_page: https://polymer-library.polymer-project.org/3.0/docs/first-element/step-5 · fetched 2026-08-29 · 0991b73c07d8
- site_page: https://polymer-library.polymer-project.org/3.0/docs/about_30 · fetched 2026-08-29 · 880d8cff516a
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| Polymer/polymer | main | 57 |
| Polymer/old-docs-site | docs | 10 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem