The best alternatives to Lipp are MicMonster, Wonder Keyboard, and Modulate. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Lipp?
AssemblyAI— Multilingual Speech-to-Text API with superhuman accuracy
MicMonster is an online text-to-speech solution with natural voices. You are also getting voice style (angry, sad, cheerful) for a few voices. It can transform the text into voice in 48 languages.
We create realistic and fully customizable voice skins, to give you complete vocal freedom right as you speak. Try it for yourself or enable voice skins in your game, app, or other platform.