OneSignal

OneSignal is push notifications for apps and websites with in-app messages, email, SMS and Journeys in one platform, with a free tier and usage-based pricing.

OneSignal is a messaging platform for apps and websites that grew out of a push notification service and still leads with push. It is built for teams that ship an app and want one place to reach users on the device, the web and the inbox, and for the developers inside them. It is made by OneSignal, a San Mateo company that has operated since 2014. Mobile push ships with SDKs for iOS, Android, Huawei, React Native, Flutter, Unity and Expo, web push covers Chrome, Safari and Firefox, and a WordPress plugin fires a notification when a post is published. The other channels layer on the same audience data: in-app messages with carousel screens built in a drag-and-drop editor, an email channel with an HTML editor, SMS and RCS through Twilio, and iOS Live Activities for lock-screen updates such as delivery tracking or live scores. Journeys is the visual builder that strings those channels into onboarding, re-engagement and cart-recovery flows, with audience segments and data tags, event-triggered messages, Intelligent Delivery send-time optimisation, timezone delivery, geofence and location triggers and frequency capping on the top tier. Rich media and action buttons, A/B testing, confirmed receipt tracking and conversion metrics shape and measure each message, the API allows unlimited sends on every plan, and the OneSignal AI assistant helps with drafting. Segment, Mixpanel, Amplitude, BigQuery, Snowflake and RudderStack integrations move the data, a Shopify app comes through a partner, and multiple apps live under one organization. OneSignal suits mobile app publishers and game studios, news and media apps sending breaking alerts, ecommerce apps with cart and price-drop alerts, developers who want an unlimited push API, fintech and delivery apps using Live Activities, and teams starting free and paying by usage. It is sold on a permanent Free tier sized by monthly active users and web subscribers, a Growth tier billed month to month as a platform fee plus usage, and Professional and Enterprise annual contracts priced by sales, where advanced analytics, CSV exports and the notification history API begin. The plan cards list every tier. In daily use OneSignal sends the onboarding and activation pushes, the re-engagement and win-back campaign, the cart and browse abandonment alert, the back-in-stock and price-drop notification, the live order tracking on the lock screen and the new post alert for a WordPress publisher, and it runs cross-channel lifecycle journeys. It feeds and reads the analytics stack, so it sits beside Segment, Mixpanel or a warehouse and the app's own backend rather than replacing them.