Attach might be a bit more popular than MessageBird. We know about 1 link to it since March 2021 and only 1 link to MessageBird. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
We built a subscription management chatbot, using Twilio for sending SMS, but it lacked a dashboard to view conversations. I've recently come across https://messagebird.com/en/ - they have a pre-built dashboard that allows your team to respond to messages, as well as a nifty flow builder. Source: almost 3 years ago
Embedd a product 2 page short pdf into the email and track with attach.io? Source: almost 2 years ago
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Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
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