The best alternatives to Sleevenote are Aux, Songlink 2.0, and Son.gg in Slack. If these 3 options don't work for you, we've listed a few more alternatives below.
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Intercom for Startups— Advanced AI-powered features at a 90% discount
A website for making and sharing music box songs. It's free to use and doesn't require an account to make and share songs (all song data is stored in the URL).
Pipe is easy-to-use music player with over Wi-Fi file transfer feature. Brief details of Pipe's features: - File Transfer over Wi-Fi, - FLAC, ALAC and AAC file support, - Mini Player, - Album's artwork based colors - Storage Details And more...