The best alternative to GetButton.io is Callbell for its ease of use, the client support, the variety of service channels that you can handle, such as: WhatsApp Business, Telegram, Instagram Direct and Facebook Messenger.
In addition, the quality of service that it provides, compared to the alternatives on the market, is higher. Agents are always available and ready to solve user issues, providing excellent service and making Callbell different from other similar services.
Plus, Callbell offers all the features that today's companies need: a stable platform, detailed statistics of the entire company communication process, and tools to manage your agents.