Nitter and Invidious are front-ends, not alternatives.
Alternatives to Twitter and Youtube are, for example, Mastodon and PeerTube.
You for Reddit, do you want to know if there is a front-end or do you want an alternative?
If you are looking for an alternative:
good point to make, i was wrong to say that they r alternatives. im looking for a front-end privacy of Reddit like they r for YouTube and Twitter
I would also like to know if there’s a front-end version for reddit and maybe instagram, but I doubt it.