Ringtone maker for iPhone 6S, no jailbreak?

The cost of ringtones is asinine, and I rarely can find the music I like anyway. I have downloaded ringtone makers, but they always crash.

I don't have jailbreak on my iPhone 6S and I don't plan to in future. I need a reliable ringtone maker that is compatible to my phone and will allow me to make ringtones from the music I have on the phone.

http://www.iclarified.com/439/how-to-create-custom-ringtones-for-an-iphone-using-windows
Quite old, unfortunately not up to date, but the method still works. Works similarly for Macs as well

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