Switch from Firebase Authentication to a better OTP solution. Save costs with pay-as-you-go pricing, add multi-channel support, and keep your existing workflow. Migration takes minutes.
Common reasons developers migrate away from Firebase
Firebase charges per verification attempt, even failed ones. With Sendmator, pay only for successful deliveries with transparent, predictable pricing.
Firebase limits you to SMS. Sendmator supports SMS, email, and WhatsApp with automatic fallback between channels.
Decouple your authentication from Firebase's ecosystem. Use any database, any backend framework, any hosting provider.
Get detailed insights into delivery rates, costs per channel, user preferences, and verification success rates.
See how Sendmator stacks up
| Feature | Firebase | Sendmator |
|---|---|---|
| SMS Support | ||
| Email OTP | ||
| WhatsApp Support | ||
| Multi-Channel Fallback | ||
| Pay-as-you-go Pricing | ||
| Framework Independent | Requires Firebase SDK | Works with any stack |
| Custom Templates | ||
| Detailed Analytics | Basic | Advanced |
Replace Firebase Phone Auth in 3 simple steps
import { auth } from 'firebase/auth';
const recaptcha = new RecaptchaVerifier(
auth, 'recaptcha', {}
);
// Send OTP
const confirmationResult =
await signInWithPhoneNumber(
auth, phoneNumber, recaptcha
);
// Verify
await confirmationResult
.confirm(code);// Send OTP (SMS, Email, or WhatsApp)
const { session_id } = await fetch(
'https://api.sendmator.com/v1/otp/generate',
{
method: 'POST',
headers: {
'Authorization': 'Bearer KEY'
},
body: JSON.stringify({
identifier: phoneNumber,
channel: 'sms'
})
}
).then(r => r.json());
// Verify
const { verified } = await fetch(
'https://api.sendmator.com/v1/otp/verify',
{
method: 'POST',
body: JSON.stringify({
session_id, code
})
}
).then(r => r.json());Create Sendmator account and get API keys in seconds
Swap Firebase calls with Sendmator API endpoints
Test with free credits, then deploy to production
Everything Firebase offers, plus more
No SDK required. Works with any language, any framework. Just HTTP requests.
Send OTP to 180+ countries with reliable delivery and intelligent routing.
Rate limiting, fraud detection, and security features built-in from day one.
Fully customizable message templates with your brand colors and logo.
Real human support for developers. Get help when you need it.
SMS delivered in under 10 seconds, email in under 3 seconds globally.
Free credits included. Migrate in minutes with our simple API.