The best alternatives to CantoCards are Fluent, Duolingo, and Toucan. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
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BoldVoice is an accent coaching app for non-native English speakers that helps them be as well-understood and confident in English as in their own language. You get personalized daily video lessons by a Hollywood coach and immediate pronunciation feedback.