SMSFlow turns your Android devices into a powerful SMS platform. Send transactional alerts, marketing campaigns, and OTPs through your own SIM cards — no per-message costs.
50M+
Messages sent
99.9%
Uptime SLA
< 2s
Avg delivery
A complete platform for businesses that need reliable, cost-effective messaging at scale.
Pair your Android phones via QR code. Each device acts as a dedicated SMS gateway with real-time status and auto-failover.
Messages queue intelligently across your device pool. BullMQ-powered processing ensures zero message loss even during spikes.
Full-featured REST API with scoped API keys. Integrate in minutes with any language or framework using our documented endpoints.
Get real-time delivery receipts and inbound SMS pushed to your endpoint. HMAC-signed for security.
Track delivery rates, device performance, and message volume over time with interactive charts.
Import contacts from Excel, organize into groups, and use templates with dynamic {{variables}} for personalized campaigns.
JWT auth, API key scopes, HMAC webhook signatures, rate limiting, and encrypted credentials at rest.
Receive inbound SMS directly to your dashboard and webhook endpoints. Full conversation threading coming soon.
Native WooCommerce integration sends order confirmations, shipping updates, and OTPs without any custom code.
No SIM card contracts, no carrier approvals, no per-message fees.
Sign up free. No credit card required for the starter plan.
Install our lightweight companion app and scan the QR code. Takes 60 seconds.
Use the dashboard, REST API, or our WordPress plugin. Your messages go out immediately.
Our REST API is fully documented with scoped API keys, rate limiting, and HMAC-signed webhook delivery. Works with any stack.
# Send an SMS via the REST API
curl -X POST https://api.smsflow.io/messages \
-H "Authorization: Bearer sk_live_xxx" \
-H "Content-Type: application/json" \
-d '{
"phoneNumber": "+15551234567",
"body": "Hello {{name}}, your OTP is {{code}}",
"variables": {
"name": "Sarah",
"code": "849201"
}
}'
# Response
{
"id": "msg_01JXXXXXXXXXX",
"status": "QUEUED",
"phoneNumber": "+15551234567",
"createdAt": "2025-01-15T10:30:00Z"
}"We cut our SMS costs by 80% after switching to SMSFlow. The WooCommerce plugin had us live in under an hour."
Maria González
Head of E-commerce, ShopBright
"The webhook integration is rock-solid. We process 50,000 OTPs a month without a single missed delivery."
David Chen
CTO, AuthStack
"Finally an SMS gateway that doesn't require a 12-month contract. The API is clean and the dashboard is beautiful."
Priya Nair
Developer, Notify.io
No per-message fees. Pay once, send as many SMS as your SIM allows.
For individuals and small projects
For growing businesses
For high-volume teams
All plans include a 14-day free trial. No credit card required to start.
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