How accurate are free online IQ tests?

I took one online for free and said I had an IQ of 139, which is considered very superior
I took a different IQ test that I had to pay for, and it said I had an IQ of 110, which is in the high average range, but I was also really tired when I took it

I consider myself pretty smart but I wouldn't consider myself gifted

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EugenieLaBorgia · F

Oh, they are like this:-

1. What is your name? Eugènie

Congratulations, you have an i.q of 180

JimminyChristmas · 56-60, M

@EugenieLaBorgia Well yeah, because you know how to spell it. Have you noticed the way some folks write?

EugenieLaBorgia · F

@JimminyChristmas Yes, it's...hmmm...interesting!