How can I say in Spanish " on three, one is free!"? Uno cada tres es gratis?

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Quizá te refieras a las ofertas del supermercado:
Buy 2 Get 1 Free >> 3x2 (tres por dos) = ¡Leva 3, paga 2!

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llevándote 3,uno gratis
por la compra de 3,uno gratis

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it's a "3 for 2 offer" or if it's 1 for 1 you might say "buy one get one free" which is sometimes called "BOGOF"

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I think we are going to need more context , I have never heard this phrase in English before. So I am unable to help , sorry.

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¡Hola!

I think it means that for every 3 units you get one for free.

Hope it helps!

Angeles.