Comparison
InstantPWA vs OneSignal
Web push is great. But you can't push to someone who never installed your app.
OneSignal is built for sending notifications to existing subscribers. InstantPWA gets visitors to install your PWA in the first place — then OneSignal can push to them.
Home-screen install popup
InstantPWA
Yes
OneSignal
No
Native A/B testing of the install moment
InstantPWA
Yes
OneSignal
Push only
iOS install instructions (Safari)
InstantPWA
Yes
OneSignal
No
Per-page URL targeting
InstantPWA
Yes
OneSignal
Yes
Geo & language targeting
InstantPWA
Yes
OneSignal
Yes
Web push campaigns
InstantPWA
Roadmap
OneSignal
Yes
Email & SMS channels
InstantPWA
No
OneSignal
Yes
One-line script install
InstantPWA
Yes
OneSignal
Yes
Free plan
InstantPWA
Generous
OneSignal
Generous
When to pick which
Use OneSignal if you already have subscribers and want to send rich push campaigns. Use InstantPWA — or both — when your problem is getting people onto your app in the first place.