Email API That
Thinks for You
The smartest email API for developers. AI optimizes deliverability, generates templates, and routes through the best provider — so every email lands in the inbox.
1,000 emails/month free. No credit card required.
What is AISend?
AISend is an AI-powered email API platform for developers. Unlike traditional email services, AISend uses machine learning to optimize every aspect of your email delivery — from send timing and provider routing to content optimization and deliverability scoring. Just plug in our API and let AI handle the rest.
Send an Email in 5 Minutes
Sign up, grab an API key, send your first email. It's that simple.
Node.js SDK
import { AISend } from 'aisend';
const aisend = new AISend('as_your_api_key');
await aisend.emails.send({
from: 'hello@yourdomain.com',
to: 'user@example.com',
subject: 'Welcome to AISend',
html: '<p>Your email, powered by AI.</p>'
});cURL
curl -X POST https://api.aisend.app/v1/emails \
-H "Authorization: Bearer as_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"from": "hello@yourdomain.com",
"to": "user@example.com",
"subject": "Welcome to AISend",
"html": "<p>Your email, powered by AI.</p>"
}'Smart Email, Not Just Fast Email
Every feature is designed to get your emails delivered — and read.
AI-Powered Deliverability
Machine learning optimizes send times, routing, and content to maximize inbox placement.
Smart Templates
Generate email templates from a prompt. AI writes the HTML, you send in seconds.
Intelligent Analytics
AI-driven insights into open rates, bounce patterns, and engagement — with actionable recommendations.
Developer-First API
Clean REST API with SDKs for Node.js, Python, Go, and more. Ship email in 5 minutes.
Custom Domains
One-click domain setup with automated SPF, DKIM, and DMARC verification.
Webhooks & Events
Real-time delivery events — sent, delivered, opened, clicked, bounced — via webhooks.
Multi-Provider Routing
AI automatically routes through the best provider (SES, SMTP, Postmark) for each email.
Resend-Compatible
Drop-in replacement for Resend. Migrate by changing one URL — zero code changes.
Built for Developers Who Care About Delivery
We're building the email API we always wanted — one that doesn't just send, but thinks.
3
Email providers
<200ms
API response time
5 min
Time to first email
0
Vendor lock-in
Resend-compatible API
Same API format as Resend. Migrate by changing one URL — zero code changes required.
Multi-provider failover
AI routes through SES, Postmark, or SMTP based on real-time deliverability. No single point of failure.
Open and transparent
1,000 emails/month free. No credit card. No hidden fees. Upgrade only when you need to scale.
Try the API
See how simple it is to send an email with AISend. One API call, AI handles the rest.
Request
curl -X POST https://api.aisend.app/v1/emails \
-H "Authorization: Bearer as_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"from": "hello@yourdomain.com",
"to": "user@example.com",
"subject": "Welcome!",
"html": "<p>Your first AI-powered email.</p>"
}'Response
{
"id": "email_8f3k2j1m",
"from": "hello@yourdomain.com",
"to": "user@example.com",
"subject": "Welcome!",
"status": "sent",
"provider": "ses",
"ai_score": 98,
"created_at": "2026-03-15T10:30:00Z"
}Click "Try it" to see the response
How AI Makes the Difference
Smart Provider Routing
AISend analyzes bounce rates, latency, and deliverability across providers in real-time. Each email is automatically routed through the provider most likely to succeed — SES for bulk, Postmark for transactional, SMTP for fallback.
Deliverability Scoring
Before you hit send, AI scores your email content, subject line, and sender reputation. Get actionable suggestions to improve inbox placement before a single email goes out.
Send Time Optimization
AI learns when your recipients are most likely to open emails and automatically optimizes delivery timing for maximum engagement.
Template Generation
Describe what you want in plain English — "a welcome email for a SaaS app" — and AI generates a responsive HTML template you can send immediately.
AISend vs The Competition
| Feature | AISend | Resend | SendGrid |
|---|---|---|---|
| AI Deliverability | Yes | No | No |
| Smart Routing | Multi-provider AI | Single provider | Single provider |
| Template Generation | AI-powered | React Email | Visual editor |
| Send Time Optimization | Yes | No | Limited |
| Custom Domains | Yes | Yes | Yes |
| Webhooks | Yes | Yes | Yes |
| Free Tier | 1,000 emails/mo | 100 emails/day | 100 emails/day |
| Resend-Compatible API | Yes | — | No |
Start Sending Smarter Emails Today
1,000 emails/month free. No credit card required. Set up in 5 minutes.
Frequently Asked Questions
What is AISend?
AISend is an AI-powered email API platform for developers. It provides a REST API and SDKs for sending transactional emails, with built-in AI features like smart provider routing, deliverability optimization, send time optimization, and template generation.
How is AISend different from Resend or SendGrid?
AISend adds an AI layer on top of email delivery. Instead of just sending emails, AI optimizes every send — choosing the best provider, timing, and content to maximize inbox placement. Plus, our API is compatible with Resend, so migration takes minutes.
What does the free tier include?
The free tier includes 1,000 emails per month, 1 custom domain, webhooks, and access to all AI features. No credit card required to start.
Can I migrate from Resend to AISend?
Yes. AISend's API is designed to be compatible with Resend. You can switch by updating your API endpoint URL and API key — no code changes needed.
What email providers does AISend use?
AISend intelligently routes through AWS SES, Postmark, and SMTP providers. Our AI selects the best provider for each email based on recipient domain, content type, and real-time deliverability data.
Is AISend secure?
Yes. All data is encrypted in transit and at rest. We support custom domains with DKIM, SPF, and DMARC. API keys are hashed and never stored in plain text.