One API for email, SMS, auth,
payments, and 120+ languages

Stop juggling Twilio and SendGrid. LANGR unifies transactional email, SMS OTP, authentication, payments, SEO, content, and translation into a single API with one key.

npm install @langr/sdk
47
Endpoints
120+
Locales
9
RTL Languages
11
Services
0
Dependencies

Everything you need in one API

11 services, one API key, one SDK. No vendor lock-in.

Mail API

Self-hosted transactional email via Stalwart SMTP, Europe-hosted with DKIM signing. Read inboxes. Manage domains.

View endpoints →
💬

SMS API

Send SMS messages and OTP codes. Europe-optimized. Global delivery.

View endpoints →
🔒

Auth API

OTP (email + SMS), magic links, Google OAuth. Session management with 30-day tokens.

View endpoints →
💳

Payment API

Stripe checkout sessions, billing portal, webhooks, event tracking.

View endpoints →
🔎

SEO API

Domain audits, keyword tracking, rankings, backlinks, competitor analysis, Lighthouse.

View endpoints →

Content API

AI content generation via Claude. Blog posts, SEO copy, product descriptions, email drafts.

View endpoints →
🌐

i18n API

Translate text or JSON to 120+ locales. RTL-aware. Formal/informal register. Batch up to 50 locales.

View endpoints →

Ship in 10 lines

Install the SDK and start calling any service immediately.

import { LangrClient } from "@langr/sdk";

const langr = new LangrClient({ apiKey: "lk_live_..." });

// Send a transactional email
await langr.mail.send({
  from: "[email protected]",
  to: "[email protected]",
  subject: "Welcome!",
  html: "<h1>You're in.</h1>",
});

// Send SMS OTP and verify
await langr.sms.sendOtp({ to: "+4512345678" });
await langr.sms.verifyOtp({ to: "+4512345678", code: "123456" });

// Translate to 4 languages
const result = await langr.i18n.translate({
  text: "Hello, world!",
  target_locales: ["da", "de", "ar", "ja"],
});

Simple, transparent pricing

Start free. Scale when you need to.

Free

$0/month
Perfect for prototyping and side projects.
  • 100 requests/day
  • 30 requests/minute
  • All 47 endpoints
  • All 11 services
  • TypeScript SDK
  • Community support
Get Started

Enterprise

Custom
For high-volume and custom requirements.
  • Unlimited requests
  • 1,000+ requests/minute
  • All 47 endpoints
  • Dedicated support
  • Custom SLA
  • On-boarding assistance
Contact Us

Replace multiple vendors with one API

Looking for a Twilio or SendGrid alternative? LANGR combines what you need in a single, Europe-hosted API.

FeatureLANGRTwilioSendGrid
Transactional email
SMS + OTP
Authentication
Payments
SEO audits
AI content
i18n (120+ locales)
Single SDK
Free tier
Europe-hosted