I just saw a professional-looking article yesterday that says ukulele basses are tuned one octave higher than regular basses and those that are tuned the same are ukulele contrabasses. If you’ve seen any YouTube reviews of U-Basses it’s obviously wrong. If it’s octave higher it’s the bottom 4 strings of a guitar, that’s not particularly bassy.
That article probably uses the term "bass ukulele" to refer to a lone commercial model, the Luna Guitars Tattoo Uke Bass:
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which is indeed tuned E2-A2-D3-G3, like the 4 low strings of a standard guitar -
ou one octave above the bass (viol, or guitar, or uke-shaped) - and it sports metal flatwound strings.
The reasoning is that it makes little sense that the bass member of the ukulele family be tuned over two octaves below the baritone ukulele. So the Luna has a better claim to that title than the Kala, which would then be called a "contrabass ukulele".
In this context, "bass" is not to be intended as an absolute term. "Bass" is a member of an instrument family which is is tuned suitably lower than its prime member (usually one octave). The lowest note of a bass flute is C3, not E1. It's all relative.
The phrase "contrabass ukulele" to refer to the Kala UBass may not be popular on YouTube but it is used on the internet by anyone who is sensitive to the above considerations. I also am, but I prefer the hyphenated "bass-ukulele", or better yet the reversed phrase, "ukulele bass": to my mind it's a
hybrid, not solely a uke.
Moreover, it is and can only be (acoustic-)electric - unlike the Luna which does have a fighting chance of being heard acoustically.
(To continue this sticklery, I must add that I also have problems with the Luna's tuning being neither re-entrant not conducive to ordinary uke chord shapes but hey, the baritone uke tuning already broke with the former tradition, so I guess breaking with the latter is no sacrilege.)