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Built on Rust + Cloudflare

Email delivery that
Just works.

The frictionless email platform built for developers and trusted by enterprises.One-line API. 99.99% uptime. Transparent pricing.No overage charges. No hidden fees.

Start Sending FreeView Documentation
API v1.0Sending in progress12.4K sent
1 Line API•2ms avg latency

One-line email sending —
that's it.

curl it or code it
Rust · Node.js · Python · Go
4.9
99.97% Deliverability
AI-optimized routing
<2ms Avg Latency
Edge-powered delivery
No Hidden Fees
From $0.004/email
SDKs for Every Stack
Rust, Node, Python, Go, Java
10B+
Emails Delivered
99.99%
Uptime Guaranteed
4.9/5
Developer Rating
10K+
Active Developers
Trusted by engineering teams worldwide
The Problem with Legacy Email

Email infrastructure is
stuck in the past.

Legacy providers give you overage bills, opaque APIs, and frustrating support. We built something better.

Traditional Email Providers
Overage charges
Opaque pricing
Slow delivery
Poor support
Complex SDKs
No enterprise features
legacy-provider.com
$12,432
Contact Sales for Pricing
Hidden overage charges: +$0.05/email beyond limit
VS
InboxFlow
inboxflow.dev/dashboard
1.2M
Sent Today
99.97%
Delivery Rate
$0.00
Overage Fees
API Key:if_live_••••••••••••••••Active
Send Your First Email →
Transparent pricing — no overage, no hidden fees, no surprises
bash — curl example
$ curl -X POST https://api.inboxflow.dev/v1/email/send \
-H "Authorization: Bearer if_live_..." \
-H "Content-Type: application/json" \
-d '{'
"from": "App <noreply@example.com>",
"to": ["user@example.com"],
"subject": "Welcome!",
"html": "<h1>Welcome!</h1><p>Thanks for joining.</p>"
}'
{"id":"msg_abc123","status":"queued"}
One-Line API

Send email in
one line of code

No 15-step setup. No 50KB SDKs. Just a single API call and you're sending emails. From signup to first send in under 2 minutes.

  • Simple REST API — POST /v1/email/send
  • SDKs for Rust, Node.js, Python, Go, and Java
  • Idempotency keys, custom headers, attachments (up to 25MB)
  • Clear validation errors with actionable messages
Real-Time Analytics

Every email.
Every millisecond.

Stop guessing what's happening with your email. Get real-time visibility into delivery, opens, clicks, bounces, and engagement — all in a beautiful dashboard.

  • Real-time delivery & engagement dashboards
  • Per-message tracking with opens, clicks, and bounces
  • Exportable analytics via API and CSV
  • Webhook events for every delivery status

Delivery Overview

Live
Sent
847,291
Delivered
846,830
Opens
423,415
Clicks
127,024

Security & Compliance

Enterprise-grade, built-in from day one

SOC 2 Compliant
Infrastructure & controls audited annually
SSO / SAML
Okta, Azure AD, Google Workspace
RBAC
Role-based access control with custom roles
Audit Logs
Every action logged, retained for 90 days
Encryption
AES-256 at rest, TLS 1.3 in transit
Dedicated IPs
Warm pools for high-volume senders
Enterprise Security

Built for
the enterprise

SSO, audit trails, RBAC, dedicated IPs — not as add-ons, but as core architecture. Your security team will be happy. Your developers will be productive.

  • SSO/SAML, RBAC, and audit logs built into every tier
  • SOC 2 Type II certified infrastructure
  • Dedicated warm IP pools for high-volume senders
  • 99.99% uptime SLA with enterprise support
AI-Powered Deliverability

Smart delivery that
learns and adapts

Our AI engine analyzes millions of delivery signals to optimize routing, predict inbox placement, and catch deliverability issues before they affect your campaigns.

  • Predictive deliverability scoring for every send
  • Automatic domain warm-up and IP reputation management
  • Real-time spam score analysis and content suggestions
  • Anomaly detection with proactive alerts

Deliverability Score

Real-time AI analysis for every campaign

Overall Health96%
SPF
✅
Pass
DKIM
✅
Verified
DMARC
🔄
Monitoring
Reputation
🟢
Excellent
Getting Started

From zero to sending in
under 2 minutes

The simplest way to start sending emails at scale. No sales calls. No credit card required.

01
1
inboxflow.dev/signup
your@email.comFree
Create Account

Sign up for free

Create your account with just an email and password. No credit card needed. Start sending immediately.

02
2
inboxflow.dev/dashboard
API Key:if_live_if_••••••••••Copy
Quickstart — Choose your language
curlNode.jsPythonGo

Grab your API key

Your API key is ready instantly in the dashboard. Pick your language and use our copy-paste code snippet.

03
3
api.inboxflow.dev
$ curl -X POST https://api.inboxflow.dev/v1/email/send \
-H "Authorization: Bearer if_live_..." \
-H "Content-Type: application/json" \
-d '{'
"to": "user@example.com",
"subject": "Hello from InboxFlow"
}'
{"id":"msg_xyz","status":"sent"}

Send your first email

One curl command and you're live. Track delivery, opens, and clicks in real-time from your dashboard.

Transparent Pricing

Predictable pricing.
No overage charges.

Pay only for what you send. No hidden fees, no surprise bills, no "contact sales" maze.

Free
$0
free forever — 1,000 emails/mo
Get Started Free
1,000 emails per month
REST API access
Basic analytics
Community support
1 domain
Most Popular
Hacker
$4
/month — 100,000 emails
Subscribe Now
100,000 emails per month
REST API + SMTP relay
Real-time analytics
Webhook events
3 domains
Email support
Startup
$35
/month — 1,000,000 emails
Subscribe Now
1,000,000 emails per month
REST API + SMTP relay
Real-time analytics + CSV export
Webhooks + event data
10 domains
Priority email + chat support
Business
$250
/month — 10,000,000 emails
Subscribe Now
10,000,000 emails per month
REST API + SMTP + SDKs
Advanced analytics + API access
Sub-user management (RBAC)
Dedicated IP pools
SSO/SAML + Audit logs
99.99% SLA + dedicated support
Enterprise

Need more? We've got you covered.

Custom volume pricing, dedicated infrastructure, advanced compliance, and a dedicated solutions engineer.

  • Custom contracts & volume discounts
  • Dedicated solutions engineer & onboarding
  • Dedicated infrastructure & data residency
  • Custom SLA with financial guarantees
Talk to Sales
No overage charges — ever
Cancel anytime — no contracts
Free migration support
Trusted by Developers

Loved by teams shipping
millions of emails

From solo developers to Fortune 500 engineering teams — see why they made the switch.

"We migrated from SendGrid to InboxFlow and cut our email costs by 72%. The API is cleaner, the docs are better, and delivery rates actually improved. It's rare to find a product that's both cheaper and better."
JD
James Doyle
CTO, CryptoPay
Migrated from SendGrid-72% cost
"We send 50M+ emails a month for our platform. InboxFlow is the only provider that has never had a deliverability issue for us. Their AI warmup and reputation management is genuinely impressive."
SK
Sarah Kim
Engineering Lead, Finova
High Volume50M+/mo
"The developer experience is unmatched. We went from signup to sending in production in under 30 minutes. The webhook system is rock solid, and their support team actually knows what they're talking about."
MR
Marcus Rivera
Founder, LaunchKit
StartupFast Onboarding
FAQ

Everything you need to know
before you start

Still have questions? We've got answers. If you can't find what you're looking for, our team is here to help.

InboxFlow is built from the ground up on Rust + Cloudflare, giving us 60-80% lower operational costs compared to legacy providers. We pass those savings to you with transparent, predictable pricing — no overage charges, no hidden fees. Our API is designed for developer happiness, and our AI-powered deliverability engine ensures higher inbox placement rates.
Absolutely. Our API is designed to be a drop-in replacement for SendGrid, AWS SES, Mailgun, and Postmark. Most customers complete migration in under 2 hours. We also offer free migration support — our team will help you move templates, DNS records, and webhooks. Zero downtime guaranteed.
Deliverability is our core competency. Our AI engine analyzes millions of signals — including ISP feedback loops, engagement metrics, and content patterns — to optimize every send. We maintain warm IP pools, automatic SPF/DKIM/DMARC configuration, and real-time spam score analysis. Our customers consistently see 97%+ inbox placement rates.
Yes. InboxFlow is SOC 2 Type II certified, with AES-256 encryption at rest and TLS 1.3 in transit. Enterprise features include SSO/SAML (Okta, Azure AD, Google Workspace), RBAC with custom roles, comprehensive audit logs, dedicated IP pools, and custom data residency options. We also offer a 99.99% uptime SLA.
Free and Hacker plans get community support and email support. Startup plans include priority email and chat support with a 4-hour response time. Business and Enterprise plans get dedicated support with a 1-hour response time, a dedicated account manager, and a solutions engineer for onboarding and optimization.

Still have questions?

Our team is ready to help. Choose the option that works best for you.

Email Support

We respond within 2 hours

Documentation

Comprehensive guides & API refs

Talk to Sales

Enterprise inquiries & custom plans

Start Sending Today

Ready to ship
emails that arrive?

Join 10,000+ developers who trust InboxFlow for reliable email delivery. No credit card required. No sales calls. No overage charges.

Start Free — Send Your First EmailRead the Docs
No credit card required
1,000 free emails every month
Cancel anytime, no contracts