The best alternatives to Heymoji are Slack, Rocket, and Alfred Emoji Pack. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Slack is an application that helps teams communicate and work together by combining messaging, file sharing, and app integrations in one place. It makes it easy for teams to stay connected and work efficiently, whether they are in the office or working remotely.