What is the crowd's opinion of Crisp?

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Crisp has apps and stuff: https://crisp.im/en/apps/

As for startups, thismo seems to be doing something you’re trying to describe. Their website mentions both customer support and sending out notifications, such as course cancellation, info on discounts etc. They haven’t launched yet but some screens and features are shown here: Messenger for business.

The trick, as always, would be to convince customers to use it :)