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I have Steemplus plugin for Chrome, that shows, if user is bot or a spammer.
You can tell by reading users comments. Bots have a pattern they follow, some are very easily distinguished

Is there something you can use from Android too?

Most legitimate bots will say it in the profile it is a bot. Sometimes a website link in the profile can help you infer whether a user is a bot or real person.

This can't be told by just seeing the profile.
First of all you need to know what is a bot. It's a kind of program which is created by developers with different language. When you put your accounts master key or any other key in the program, the account start working as written in program. At that situation we call it a bot account.
There are different kind of bots. Such as voting bot, curation bot, auto comment bot, downvote bot and many more. You can't just know if the account is bot or not by seeing the profile. You have to check it's activity.
Generally bot account's has some unusual activity like auto comment bot keep commenting on everyone's post which is difficult for non-bot account.
So, we can know by checking the activity. To check activity you can use Steemd block explorer.

Thank you for sharing on this subject and shredding light. Now I know alittle more about bots and that they are separated per action.

Mainly says it in a post of your profile appears otherwise in the information of your profile, another way is to check the feed of this to see if you have something unusual such as for you to send transactions with url if this vote is a bot of upvotes otherwise it would not be another way is to see if all the votes are always ax percentage thus verify that this is a bot that follows the changes of another person. the idea is to look in your transactions to see if you have unusual things but as I told you at the beginning if it is a bot this will appear your information on the page description of the profile or in a post

You can't because on the blockchain humans and bots behave the same. and an account could also be both.. You can analyze it's transactions on https://steemd.com to see if it is "too active" to be human :D

having a good look at the posts should tell you, bots will have recurring patterns beyond humans with recurring topics, or re-steem only. relying on blacklists is something i would advise against because they are created by single people with single minds