Documentation
Everything you need to integrate Greatr SMS
What is Greatr SMS?
Greatr SMS is an SMS gateway that uses your Android phone as the gateway. Control it through the web dashboard or REST API — no per-message fees from commercial providers; you use your existing phone plan.
Key Benefits
Cost-effective
No per-message fees from third-party providers
Easy integration
Simple REST API works with any programming language
Private and secure
Your messages stay on your devices
Flexible
Works with any application that can make HTTP requests
Use Cases
- Notifications and alerts: Order confirmations, appointment reminders, system alerts
- Two-factor authentication (2FA): Send OTP and verification codes via SMS
- Marketing campaigns: Promotional messages (ensure compliance with local regulations)
- Customer communication: Two-way SMS with customers
- Personal automation: Reminders, IoT alerts, and similar use cases
Getting Started
Create your account
Sign up at sms.greatzern.com
Install the Android app
Download and install the Greatr SMS app on your Android phone
Register your device
Scan the QR code or enter your API key in the app
Send your first SMS
Use the dashboard or API to start sending messages
Limitations
- Android only: An Android phone is required; iOS is not supported.
- Phone must stay online: The device needs an active internet connection and should stay powered on.
- Message limits: Plans have monthly limits. See Pricing section for details.
Ready to start building?
Get your API key and start sending SMS in minutes. No credit card required.