OneSignal is built around marketing campaigns and lifecycle journeys, with an API for transactional sends. These six options fit when you want developer-first notification infrastructure, raw delivery, or an enterprise engagement suite.
Last reviewed November 2026. Check each vendor's pricing page for current prices; they change often.
API-first push over APNs, FCM and Web Push, with topics, notification workflows, a subscriber preference center and a React in-app inbox, sharing one API with email, SMS, webhooks and auth.
Google's free push transport for Android, Apple and web. Most push services, including OneSignal, deliver to Google Play Android devices through it.
Open-source (MIT core) notification platform with workflows across push, email, SMS, chat and in-app, plus an embeddable inbox. Cloud or self-hosted.
Hosted notification infrastructure with workflows, batching, user preferences, in-app feeds and broadcasts, aimed at developers.
Notification routing and templating across email, SMS, push and chat providers, with an in-app inbox and a visual template designer.
Customer engagement platform with segmentation, journeys, A/B testing and analytics across push, email, SMS and in-app.
For marketing campaigns at enterprise scale, Braze. For developer-built product notifications, Knock, Novu or Courier for orchestration, or Zyphr if you want delivery itself (push, email, SMS, in-app, webhooks) plus auth from one API. For free raw push, Firebase Cloud Messaging.
Novu is the most widely adopted open-source option, with 40,000+ GitHub stars and an MIT-licensed core. Firebase Cloud Messaging is free but not open source.
Yes. Zyphr sends push over APNs for iOS, FCM for Android, and the Web Push protocol for browsers.
1,000 MAU and 1,000 emails a month free. No credit card.