Comparison
InstantPWA vs PWA Fire (open source)
Starter template, or drop-in hosted layer?
PWA Fire is a starter template — you fork the repo and build from there. InstantPWA is stack-agnostic: paste one script into any existing site (WordPress, Shopify, Next.js, Rails) and the install prompt appears.
Works on existing site
InstantPWA
Yes
PWA Fire (open source)
No
Install analytics
InstantPWA
Yes
PWA Fire (open source)
No
Framework-agnostic
InstantPWA
Yes
PWA Fire (open source)
No
Open source
InstantPWA
No
PWA Fire (open source)
Yes
Free
InstantPWA
Yes
PWA Fire (open source)
Yes
When to pick which
Use PWA Fire if you are starting a new project from scratch and want an opinionated PWA template. Use InstantPWA when you already have a site and want to add the install moment without a rebuild.