Sites and apps similar to GatewayAPI include Twilio. Other options are SMSAPI, Plivo, Clickatell and Infobip. In total there are five Video Calling Apps like GatewayAPI for Android, iPhone, iPad and self-hosting.
Twilio is a web-service API that lets you use your existing web languages and skills to build voice and SMS applications. We focus on building a simple, powerful, pay-as-you-go communications platform so that you can focus on what you do best.
United States
SMSAPI.com is browser platform for bulk SMS and other SMS marketing solutions. SMSAPI offers bulk SMS, MMS, voicemailing, HLR services, shortcode, SMS notifications, newsletter SMS, MMS coupons, mail2SMS, two-way SMS and other mobile services.
Czechia
EU
Plivo offers a simple, quick, and scalable way to modernize customer communications. Businesses of all sizes — from growing startups to public companies — rely on Plivo to deliver better customer experiences.
United States
International Communication Platform as a Service (CPaaS) provider with zero-hop connectivity to telecoms globally. It supports all major mobile communication channels, like SMS, email, WhatsApp, Viber, voice, video and more, over API and web UI.
Croatia