Launching 2026
Email, SMS and push notifications in one API. Built for Java and Spring Boot developers. Pay only for what you send.
No spam. Unsubscribe anytime.
Send your first notification in under 2 minutes
// Spring Boot — one dependency, zero config StackSendClient client = new StackSendClient("sk_live_your_api_key"); client.email() .to("user@example.com") .subject("Your order was confirmed") .template("order-confirmation") .variable("orderId", orderId) .send(); // Same client for SMS and push — one API key, all channels
What's included
REST API and Spring Boot SDK. Async delivery with Kafka, retries, dead-letter queue and full delivery tracking.
Send SMS to any country. Usage-based pricing with no monthly minimums. Built-in delivery receipts.
iOS and Android push via a single API call. No SDK to maintain on the client side.
Every notification logged. Filter by status, channel, date and recipient. Export for compliance.
Get notified on delivered, bounced, opened and failed events. Retry logic included.
JWT auth, DKIM/SPF managed for you, rate limiting, bounce handling and a public status page.
Pay for what you send. No tiers, no surprises, no lock-in.
Production-grade infrastructure for teams that can't afford downtime.