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.

Vonage centralizes communication across SMS, RCS, WhatsApp, Messenger, and more, combining delivery, logic, analytics, and compliance in a single API and dashboard. WhatsApp developers can access the full Vonage suite with tools for WhatsApp integration. The platform supports WhatsApp's two message types: Template messages and Session messages which determine when you can initiate a message to a WhatsApp user. Verify API enables two-factor authentication across multiple channels including SMS, voice, WhatsApp, email, and Silent Authentication.
Unified messaging API supporting SMS, RCS, WhatsApp, and more
Funding
Business text messaging software for team-based SMS communication
G2 Rating
Starting Price
TextUs is a subscription-based SMS platform starting at $299/month with custom pricing for team size and usage. Includes team inbox, automation workflows, and CRM integrations for smarter conversations.
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.
Omnichannel business text messaging platform with team collaboration
G2 Rating
Starting Price
Heymarket offers per-user SMS and messaging plans starting at $19/user/month (billed annually) with 2-user minimum. Plans include Standard, Plus, Pro, and Enterprise with included message allotments and 10DLC registration.