Transactional and product email with an API your team wants to use, and deliverability you stop thinking about.
Customer.io is a customer engagement platform that enables marketing and product teams to send targeted, behavior-driven emails, push notifications, SMS, and in-app messages using real-time...
Resend is a developer-first email API that provides reliable transactional email delivery with a modern SDK, React email components, and detailed analytics for web application teams.
Postmark is a transactional email service focused on fast, reliable delivery of application-generated emails like password resets, order confirmations, and notifications.
Knock is a notification infrastructure platform that provides APIs for building and managing multi-channel notification systems across in-app, email, push, SMS, Slack, and other channels.
OneSignal is a customer messaging platform specializing in push notifications, email, SMS, and in-app messaging, serving over a million developers and businesses with a generous free tier.
In-app chat and messaging API for mobile and web apps with moderation, notifications, and AI chatbot integration.
Customer engagement platform focused on push notifications, in-app messaging, and email with deep segmentation and event-triggered automation.
Mailgun by Sinch is a transactional email API service for developers, providing email sending, receiving, validation, and deliverability optimization.
Enterprise mobile engagement platform delivering real-time A/B tested push notifications, in-app messages, and embedded experiences at scale.
Mobile CRM and push notification platform for apps with smart segmentation, automation scenarios, A/B testing, and in-app messaging.
Twilio is a cloud communications platform that provides APIs for SMS, voice, video, email, and WhatsApp messaging. It enables developers to embed communication capabilities into applications...
Email delivery platform combining a testing sandbox for staging emails with a production sending API for transactional and bulk email delivery.
Cost-effective email delivery service combining email marketing campaigns, transactional API, SMTP relay, and advanced deliverability tools.
Email delivery platform with StreamScore reputation monitoring, real-time analytics, and optimized infrastructure for high-volume transactional and marketing email.
Multi-channel notification infrastructure platform for product teams to design, route, and deliver notifications across email, push, SMS, and chat.
Global email delivery service with SMTP relay, email API, dedicated IPs, email testing tools, and comprehensive deliverability reporting.
Brevo (formerly Sendinblue) is an all-in-one marketing platform offering email campaigns, SMS marketing, chat, CRM, and marketing automation. It provides affordable multi-channel communicati...
Notification inbox and delivery platform offering embeddable notification center, multi-channel delivery, and user preference management via API.
Mailjet by Sinch is an email delivery and marketing platform with collaborative editing, API sending, and real-time analytics for teams.
Novu is an open-source notification infrastructure platform for managing multi-channel notifications across in-app, email, push, SMS, and chat from a unified API.
Enterprise email delivery platform providing high-volume transactional and marketing email infrastructure with predictive analytics.
Email analytics platform now part of Validity providing deliverability monitoring, inbox placement, DMARC authentication, and design rendering tools.
Transactional email and SMS API by Mailerlite for developers with drag-and-drop template builder, real-time analytics, and inbound email routing.
Customer engagement platform with email, push notifications, and web personalization.
Plain is a modern customer support platform designed for developer-first and API-first companies, providing a fast inbox, API access, and tight integration with development workflows.
Opinionated email service by Basecamp with Imbox screening, Feed for newsletters, and Paper Trail for receipts to rethink email workflows.
Web and app push notification platform with audience segmentation, drip automation, A/B testing, e-commerce triggers, and analytics dashboard.
Omnichannel communication platform formerly MessageBird providing messaging, voice, and email APIs.
Email, calendar, and contacts API platform for embedding communication features into applications.
Loops is a modern email platform built for SaaS companies, providing transactional emails, marketing campaigns, and automated sequences with a developer-friendly API and clean interface.