Push / In-app Messaging SDK Tools

Airship — Mobile engagement platform with push notifications, in-app messaging, SMS, email, and real-time data streaming SDK.

Apprise — Push / In-app Messaging SDK tool for developers. Specializes in notification library.

Apptentive — mobile customer engagement platform focused on in-app surveys, ratings prompts, and message center (now Alchemer Mobile).

In-app experience SDK for mobile apps — nudges, walkthroughs, tooltips, surveys powered by user behavior data.

Batch — Mobile push notification and in-app messaging platform with segmentation, A/B testing, and transactional message APIs.

Beamer — in-app changelog, announcements, and NPS widget to notify users about updates and gather feedback.

Blueshift — AI-first customer engagement platform (SmartHub CDP) with multichannel push, email, SMS, in-app, and predictive targeting.

Braze — Customer engagement platform with push, in-app messages, email, SMS, WhatsApp, and Canvas journey orchestration.

Catapush — reliable mobile push messaging with guaranteed delivery over persistent TCP, offering fallback to SMS when push fails.

Chameleon — In-app product experience platform for tours, tooltips, modals, and launchers with no-code builder and user targeting.

CleverTap — Mobile engagement and retention platform with push, in-app, SMS, email, and built-in analytics and segmentation.

CommandBar — User experience platform with in-app nudges, spotlight search, HelpHub, and copilot for product onboarding.

Courier — Multi-channel notification API routing messages across email, push, SMS, Slack, and in-app with template management.

Engagespot — Push / In-app Messaging SDK tool for developers. Specializes in Notification Infrastructure.

Chinese push notification and mobile data service (个推) serving 500k+ apps with user segmentation and SDKs.

Gotify — Push / In-app Messaging SDK tool for developers. Specializes in self hosted push.

Huawei Mobile Services push notification service for Android/HarmonyOS with batch and topic-based targeting.

Iterable — Cross-channel marketing platform with push, email, SMS, in-app, and web notifications with journey builder and AI personalization.

iZooto — Web and app push notification platform for publishers with audience segmentation, automation, and monetization tools.

Aurora Mobiles (极光) push notification, IM, authentication, and user analytics suite with 700k+ developers.

Knock — Notification infrastructure API with multi-channel delivery, preferences, in-app feed component, and workflow engine.

Leanplum — Mobile marketing and engagement platform with push notifications, A/B testing, in-app messages, and lifecycle campaigns.

LINEs lightweight one-way notification API — simple HTTP POST to ping users from servers, CI, IoT devices.

MagicBell — In-app notification system with embeddable notification inbox, multi-channel delivery, and developer-first REST API.

Marketo Engage — Adobes B2B marketing automation platform with email, web, push, mobile engagement, and ABM orchestration.

MoEngage — Mobile-first customer engagement platform with push, in-app, email, SMS, and WhatsApp for apps in Asia and globally.

NotificationAPI — developer-first multichannel notification infrastructure (email, SMS, push, in-app, Slack) with a no-code template editor and SDKs for web/mobile/backend.

Notivize — AI-powered transactional notifications platform that optimizes push and email content using experimentation and ML.

Novu — Open-source notification infrastructure with multi-channel support, in-app feed, user preferences, and self-hostable backend.

ntfy — Push / In-app Messaging SDK tool for developers. Specializes in push notifications.

OneSignal — Push notification, in-app messaging, email, and SMS platform with 2M+ apps using free tier and developer-first SDKs.

Ortto (formerly Autopilot) — customer journey platform with email, SMS, push, in-app messages, CDP, and analytics for SMB/mid-market.

Plotline — Mobile in-app engagement SDK for onboarding flows, feature announcements, and nudges targeting emerging market apps.

PushBase — Web push notification platform with subscriber management, automation flows, and segmentation for content publishers.

PushBots — multi-platform push notifications for iOS, Android, and web with campaign automation and segmentation.

PushEngage — Web push notification platform for e-commerce and content sites with cart abandonment, browse abandonment, and drip campaigns.

Pushnami — web push messaging platform with monetization, audience growth, and segmentation for publishers and marketers.

Pushpad — web push notifications service for developers, with REST API, WordPress plugin, and unlimited subscribers on paid plans.

Pushwoosh — Cross-platform push notification service supporting iOS, Android, and web with segmentation, automation, and analytics.

Pushy — reliable push notification delivery service using MQTT for Android, iOS, and web with guaranteed delivery focus.

Storyly — in-app Stories SDK for mobile and web, enabling Instagram-style stories inside apps for engagement and commerce.

SuprSend — Multi-channel notification infrastructure API with smart routing, user preferences, and in-app notification center SDK.

Swrve — real-time mobile marketing and engagement platform with in-app messaging, push, and A/B testing for enterprise apps.

Truepush — free web push notification platform with unlimited subscribers, segmentation, and RSS-to-push automation.

Userflow — No-code in-app product tour and onboarding builder with checklists, tooltips, and NPS surveys without engineering.

UserGuiding — affordable no-code user onboarding platform with product tours, checklists, hotspots, and resource centers.

Vibes — Mobile marketing platform for SMS, MMS, push notifications, and wallet passes targeting enterprise retail and brand campaigns.

WalkMe — Digital adoption platform with in-app guidance, automation, analytics, and workflow assistance for enterprise SaaS.

Webpushr — web push notification service with free tier up to 10k subscribers and automation for ecommerce and publishers.

WonderPush — mobile and web push notifications with predictable flat-rate pricing for unlimited notifications.

Xiaomi Mi Push — push notification service for Xiaomi MIUI devices, essential for reliable delivery on MIUI that restricts FCM.

Xtremepush — customer engagement and data platform with multichannel messaging, ML-driven orchestration, and analytics.