Twitter: Who doesn't follow me back?

There are a lot of websites out there that will tell you who doesn't follow you back on Twitter, but all the ones I found require authorization to post on your behalf. I don't want to authorize my Twitter account just to anyone and I don't even think they really need authorization because the followers/following data is public.

How do you guys check who doesn't follow you back?

As you mentioned above that there are many tools are active online that can tell us who is not following you back.

If you go and check all this manually then it can be a headache to you. I guess many each tool ask you to authorize your account.


I use - justunfollow com but it ask authorization.