The best replacement for solfege is solfa.

The best alternatives to solfege are rated as following:
★★★★★  solfa
★  earmaster

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Speaking about solfege, one probably shouldn't forget about hand signs.

Other search terms related to solfege and their ratings are:
★★★★★ hand signs
harmonic minor scale
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Google Trends

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solfege
solfa
earmaster