One of the leading options is Twilio. Twilio is a full-featured customer engagement platform with SMS, WhatsApp, voice and email APIs. It also has a Customer Data Platform (CDP) for personalizing customer journeys and predicting next-best actions. Twilio also has multichannel communication APIs, omnichannel campaigns and digital engagement centers. With a range of pricing plans including a free account, Twilio is used by more than 290,000 brands.
Another option is Kaleyra. This omnichannel communication platform offers SMS, voice, WhatsApp, chatbots and programmable voice services. Kaleyra provides secure, reliable and scalable communication services with advanced analytics and integrations with other software and platforms. It supports multiple languages and offers pay-as-you-go billing, so it's good for a wide range of industries.
If you're a business that has a high volume of interactions with customers across many channels, Bird could be a good fit. Bird is a next-gen CRM platform that handles more than 5 trillion messages per year and has tools to personalize marketing and manage customer interactions. With its full suite of APIs for email, SMS and WhatsApp, Bird is geared for businesses that have to market, sell and pay lots of people.