Glow fertility or Eve?

Is glow fertility tracker more accurate then eve?

Glow fertility tracker says I’m going to start my period in 7 days and eve is saying I’m going to start my period in 8 days. Not sure which one to believe. I’m pretty sure both the apps are made through glow. And when I set up my cycle days and which days I started my period I put them the same in both apps. So I’m not sure which one is actually right?
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