MessageBird is a CPaaS platform providing SMS, WhatsApp Business API, and multi-channel messaging services. Allows businesses to send and receive messages globally with support for rich media, fallback strategies, and high throughput.

MessageBird's API integrates voice, SMS, WhatsApp, and other channels for customer communications. Supports up to 200 requests per second with burst capacity of 1000/second. Enables two-factor authentication, alerts, customer support, and promotional messaging across 190+ countries.
Unified messaging API supporting SMS, RCS, WhatsApp, and more
Founded
Vonage Messages API helps businesses integrate SMS, RCS, WhatsApp, and more to offer rich, meaningful customer experiences. The system supports global message delivery across multiple channels with elastic capacity to handle millions of events per day.
Flexible SMS, MMS, Voice, WhatsApp and Video APIs
Founded
G2 Rating
Starting Price
Twilio Messaging provides pay-per-use APIs for SMS, MMS, WhatsApp, and voice messaging with no monthly minimums. Uses per-message and per-minute billing with global coverage.
Omnichannel customer communication and support platform
G2 Rating
Trengo offers omnichannel messaging starting with Essentials at €125/month for 5 users. Plans scale from Boost (€299/month) to Pro (€499/month) with fixed conversation allowances and comprehensive support features.