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In-App & User Notification DeliveryReal-Time User Alerts

Dispatch real-time product notifications & security alerts with zero delay

Keep users engaged and informed with instant notifications for team invites, new comments, security warnings, and activity digests. High inbox placement guaranteed.

3,000 emails/month freeZero credit card requiredSub-20ms edge latency
202 Accepted
Dispatch Latency
Queued durably before any provider call
SPF · DKIM · DMARC
Authentication
Aligned on every send
6,000
Free Monthly Sends
Forever free tier
Developer Ergonomics

Drop into your application in under 60 seconds

Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.

$npm install sadasend
send-notification.ts
typescript
TYPESCRIPT
import { SadaSend } from 'sadasend';

const sadasend = new SadaSend(process.env.SADASEND_API_KEY!);

export async function sendTeamInvite(invitedEmail: string, inviterName: string, teamName: string, inviteUrl: string) {
  return await sadasend.emails.send({
    from: 'notifications@yourdomain.com',
    to: invitedEmail,
    subject: `${inviterName} invited you to join ${teamName}`,
    html: `
      <p>Hi there,</p>
      <p><strong>${inviterName}</strong> has invited you to collaborate in <strong>${teamName}</strong>.</p>
      <p><a href="${inviteUrl}" style="background: #10b981; color: white; padding: 10px 20px; text-decoration: none; border-radius: 6px;">Accept Invitation</a></p>
    `,
    tags: ['team-invite', 'user-notification']
  });
}
Core Infrastructure

Engineered for high deliverability and zero incident risk

Every layer from edge connection pooling to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.

Instant Delivery Times

Deliver time-sensitive notifications like team invitations and security alerts in seconds, keeping team workflows fluid.

Per-Category Tagging

Tag notifications with metadata (e.g. security-alert, comment-mention, team-invite) to track analytics and delivery rates by channel.

Automatic Spam Trap Defense

Pre-flight syntax checking and suppressions protect your domain from emailing invalid addresses or known spam traps.

Scoped Keys for Microservices

Create restricted API credentials for individual microservices with recipient allowlists and velocity ceilings.

Architectural Comparison

SadaSend vs Traditional SMTP Gateways

Standard SMTP relays lack granular category tagging, suppression tracking, and sub-second edge speeds. SadaSend modernizes your notification stack.

Feature & CapabilitySadaSendTraditional SMTP Gateways
Average Edge Delivery Speed< 2 seconds10 - 45 seconds
Per-Category Analytics & Tagging
Automatic Bounced Contact Suppression
Scoped API Keys with Allowlists
Forever Free Tier
Transparent Economics

Start with 3,000 emails every month at zero cost

No artificial paywalls on security. Unlike legacy providers that reserve recipient allowlists or dedicated IP pools for high enterprise tiers, every SadaSend account receives full safety controls from day one.

3,000 dispatches monthly forever with zero credit card
All safety gates, allowlists, and velocity limits included
Scale seamlessly: Starter ($12/mo for 10k), Pro ($19/mo for 50k), Scale ($79/mo for 250k)
Free Developer Plan
$0 / mo

No credit card required

Create Free AccountCompare all paid plan tiers
Frequently Asked Questions

Everything you need to know about notification email API

Clear, transparent answers on deliverability, API authentication, and rate limits.

Use the tags array in your send payload (e.g. tags: ["notifications", "comment-mention"]). You can filter logs and metrics in the dashboard by tag.
Technical Deep Dives

Related developer guides and architectural tutorials

Explore step-by-step production implementation blueprints, benchmarks, and protocols.

Documentation

REST API Reference & Endpoints

Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.

Read guide
Documentation

Official Client SDKs (TypeScript & Python)

Official zero-dependency client SDKs for SadaSend. TypeScript and Python packages are live on npm and PyPI with typed results and auto-idempotency.

Read guide
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