@mbthemes
I have few questions,

Anti-Spam and Bot Protection Osclass Plugin ?. does it has the same functionality of akismet or I can use both of them.

At the OC-admin settings, there is a spam and bots tab. what the diffrenct,?.

which is the best and cheapest one, to go. I see registered user spam, that is bad?. like 20 users.

@codebarre
Plugin does not use akisment, but can be used together.

@mbthemes
does this OSclass plugin can protect from any spam, I mean un authorized users. still i don't see duplicate or comment spams,

@codebarre
Not quite sure what you mean, but there is no algorithm in the world that could protect from all different kinds of spam.

If i use this plugin, I guess i don't need akismet, because they charge alot based on monthly and subscription levels.

I have never used akismet.