The best alternatives to Slinghit are Refind, nēdl (as in, 'the haystack'), and This. 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
Read reviews, compare customer ratings, see screenshots, and learn more about nēdl: Find Voices. Be Heard.. Download nēdl: Find Voices. Be Heard. and enjoy it on your iPhone, iPad, and iPod touch.