The best alternatives to Unbabel are GoSquared, Boomerang, and Text/Turner. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Unbabel?
AssemblyAI— Multilingual Speech-to-Text API with superhuman accuracy
Boomerang is an iOS app that allows you to translate your text and see that translated back. It leverages Google Translate to provide translations between over 100 languages.
Connect to someone who has the app, connect Bluetooth headphones, put the phone in your pocket and you can have a conversation as if the other person spoke your language. To use this app you have to configure it, please follow the tutorial in the GitHub page