Do you think A "streak" feature in any Product increases retention?

i dont think

The gamification feature can contribute a lot to the retention.

Yes, it does! Realistically, even if you are just logging on to maintain a streak, you are likely upvoting a product or discussion while here, and even if you don't PH is still on the top of your mind because you open the app each day.

i dont think so

yes

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Yes, it does. We have a streak feature in our product that launched today! We also have a number of gamification features like points and badges in our product and without a doubt they do help with user engagement.

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yes

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no

I think it does for a week or so, apps like Duolingo implement this well

possibly. Make this question a poll!

For a level, it would work for some products. But it's not going to be the sole thing that would move the retention needle.

Statistically yes, even if the streak doesn't do anything other than increase a number. There has been lots of research done on this - the poster child for this is duolingo.