The best alternatives to Chordify are ChordIQ, ChordHelper, and ChordPic. 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
ChordPic is a completely free and by far the fastest and easiest solution. The generated chord diagrams are highly customizable and can be exported as SVG or PNG images or shared via link.