polyfillpolyfill/polyfill-service
Automatic polyfill service. observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4451
- days_rel: n/a
- days_push: 785
- n_releases_24m: 0
Adoption not part of the score
7138 stars · 675 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Polyfill.io is a web service that automatically serves JavaScript polyfills tailored to each browser. It inspects the User-Agent header of incoming requests and returns only the polyfills the requesting browser needs, reducing unnecessary payload.
Use cases
- serve browser-specific polyfills automatically
- support older browsers without bundling every polyfill
- self-host a polyfill CDN for my web app
- reduce JavaScript payload by only loading needed polyfills
- make modern JavaScript features work in legacy browsers
- add a polyfill script tag that adapts per browser
When to choose
- you need to support a wide range of browsers including legacy ones
- you want a drop-in script tag instead of manual polyfill management
- you want to self-host the service to control availability and supply-chain risk
When to avoid
- you target only evergreen modern browsers and need no polyfills
- you prefer build-time polyfill injection via tools like core-js and Babel
- you require a fully offline or air-gapped dependency
- you are concerned about third-party script supply-chain risk from hosted instances
Facets
service · maturity maintenance
http-server web-framework developer-tools web-development frontend developer-tools apis self-hosted cloud polyfills browser-compatibility user-agent-sniffing cdn javascript-polyfills cross-browser nodejs web-server
1 source
- readme: https://github.com/polyfillpolyfill/polyfill-service · fetched 2026-08-28 · 03ffecc8bcfb
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| polyfillpolyfill/polyfill-service | main | 23 |
For agents
markdown · JSON · MCP: product_card(name="polyfillpolyfill/polyfill-service")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem