Everything you need
Simple API, webhooks, and bulk messaging. All through your own Android phone.
REST SMS API
One API call to send. Works with any language — Node, Python, PHP, curl. Full REST with JSON responses.
Receive & Reply
Incoming SMS delivered to your webhook instantly. Build OTP verification, chatbots, two-way messaging.
Bulk Campaigns
Send to thousands in one request. Ideal for alerts, promotions, and notifications. Queue management built in.
Enterprise-Ready
Built for businesses. Role-based access, API key management, audit logs, and team collaboration features.
Real Analytics
Delivery rates, device health, volume trends — all in a clean dashboard updated in real time.
Multiple Devices
Connect several Android phones to scale throughput, balance load, and ensure redundancy.
Live in under 5 minutes
Install the app, generate a key, scan the QR code, and start sending.
Download the app
Install the free Android app from our download page.
Generate API key
Create a secure key from your dashboard in one click.
Scan QR code
Open the app, scan the code, and the gateway is live.
Start sending
Fire your first SMS from the dashboard or API. Done.
From OTPs to two-way support
One API, many jobs. Use Greatr SMS anywhere SMS needs to reach a real phone.
OTP & 2FA
Time-sensitive verification codes that land instantly for secure logins.
Notifications
Order confirmations, shipping updates, and delivery alerts your customers actually read.
Reminders
Cut no-shows with automated appointment reminders for clinics, salons, and services.
Alerts
Push critical system, weather, and on-call alerts the moment they happen.
Marketing
Run opt-in promotions, offers, and campaigns from your own number.
Two-Way Chat
Receive replies over webhooks. Have real conversations with your customers.
Simple Integration in Minutes
One REST endpoint. Any language. No SDKs to wrestle with.
curl -X POST \
"https://api.sms.greatzern.com/api/v1/gateway/devices/DEVICE_ID/send-sms" \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"recipients": ["+254712345678"],
"message": "Hello from Greatr SMS!"
}'Same SMS, different bill
Traditional gateways charge per message. You already pay for a phone plan. Why pay twice?
| Greatr SMS | Traditional Gateway | |
|---|---|---|
| Per-message cost | KSh 0 — your existing plan | KSh 0.80 – KSh 5+ per SMS |
| Monthly platform fee | From KSh 500/month | From KSh 5,000+/month |
| Setup time | 3 minutes | Days to weeks (KYC, registration) |
| Best for | 500 – 50,000 SMS/month | Millions of SMS/month |
Plans that grow with your business
No hidden fees. No per-message charges. Cancel anytime.
All plans include REST API, webhooks, and email support. View full pricing details →
Frequently Asked Questions
How is this different from Twilio or Africa's Talking?▼
Traditional gateways charge per SMS. Greatr SMS uses your existing Android phone and carrier plan — you pay nothing per message. For 500-50,000 SMS/month, the savings are dramatic.
Is this legal with my carrier?▼
Yes. You are sending SMS through your own SIM card and carrier plan, exactly as you would manually. Greatr SMS simply provides the API layer to automate it.
Can I cancel anytime?▼
Absolutely. Cancel from your dashboard anytime. Your plan remains active until the end of your billing period. No questions asked.
How many devices can I connect?▼
Starter: 1 device. Business: 5 devices. Enterprise: unlimited. Multiple devices increase throughput and provide redundancy.
Does it work with iPhone?▼
No. Apple restricts background SMS access on iOS. Greatr SMS works exclusively with Android devices (7.0+).
Can I receive SMS too?▼
Yes! Incoming SMS are delivered to your webhook endpoint instantly. Perfect for OTP verification, support inboxes, and two-way messaging.
Trusted by businesses across Africa
From startups to enterprises — businesses of all sizes rely on Greatr SMS.
“We send bulk SMS to our customers daily. Greatr SMS saved us over KSh 50,000/month compared to our previous provider.”
Jane M.
Operations Manager, Nairobi
“Setting up OTP verification for our app took 10 minutes. The API is dead simple. No per-message fees is a game changer.”
David K.
Lead Developer, Mombasa
“We use it for appointment reminders at our clinic. Cut no-shows by 60%. Best investment we made this year.”
Dr. Sarah W.
Medical Director, Kisumu