This is a list of all Upvote bots i've noticed and interacted with, since i signed up for steemit.

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Bot	Minimum bid	biding window	Steem power	Upvote value at 100%
@booster	0.5SBD	144 min	726,216.065 SP	$67.91
@randowhale	1 SBD	Instant	369,814.189 SP	$31.44
@bellyrub	0.5SBD	2.4h	254,099.609 SP	$24.00
@Buildawhale	0.5 SBD	2.4h	971,289.620 SP	$89.92
@minnowbooster	See minnowbooster Website	instant	2,923,946.630 SP	$157.44
@boomerang	0.05SBD	2.4h	134,717.961 SP	$12.53
@discordia	0.1SBD	2.4h	7,395.838 SP	$0.70
@drotto	0.001SBD	270 Sec	7,565.920 SP	$0.71
@minnowhelper	0.100SBD	2.4h	38,967.320 SP	$3.66
@upgoater	0.075	instant	11,020.289 SP	$1.04
@khoa	0.001 SBD	unknown	599.866 SP	$0.04
@nettybot	0.100SBD	1.2 h	13,137.822 SP	$0.95
@polsza	0.5SBD	unknown	17,477.262 SP	$1.36
@steemthat	0.010	unknown	865.362 SP	$0.08
@treeplanter	0.1SBD	instant	9,248.083 SP	$0.66
@SpinBot	See website	see post	31,248.659 SP	$2.92
@cannabiscurator	0.042SBD	2.4 h	660.782 SP	$0.06
@steemdiffuser	0.01 SBD	2.4 h	524.599 SP	$0.05

Some Background for the most popular bots

@Booster

Booster is probably the most popular Biding bot there is on steemit.Learn how to use it by checking out this post.
I'll quote some text from the original blog post

Using @Booster the right way is not so hard. In this illustration we will show you how the system works and how you can make the most out of this service by understanding its fundamentals and their purposes.

10 Times per day @Booster votes on vote-batches
So all you need to do is to send as much steemdollars to @booster as you can, in order to receive the largest upvote % from @Booster and all the members of @Frontrunner (You can join too, it is very profitable.)

New Good Posts make more money than Old Shitposts or Comments
@Booster will get you on the trending-list, but if you really want to climb on those lists and receive comments from real users and real followers - it is up to you to make sure you deliver good quality posts that will be seen by others. Remember, the goal here is for you to build up your own brand with your own audience. Be smart about it. Sometimes it pays off big time to Whale in @Booster.

Build up your SteemPower instead of using @Booster as a slot machine
With the Primary and Secondary systems well established, it is now up to you how successful you can become. Building up your SteemPower for the long run can mean that a $120 Upvote from @Booster today can be worth $120,000 in the future, just like Bitcoin. Every STEEM is precious and you can only buy them or post for them.

Before using it be sure to check out http://steem.cool/booster to see if the upvote will be profitable.

@Randowhale

Everybody heard of Rando.If you send 1 SBD(the value may change so before sending check out his blog description) rando will upvote your post/comment instant with a value between 1-5%.Every once in a while ,Rando adds up bonus value upvotes up to 25-50% so be sure to stay updated,as he regularly posts when he awakes.
A couple of things to know about randowhale original blog post:

@randowhale tries to provide the best possible service for everyone. It is not easy trying to keep the voting strength, weight and everything else aligned on something that has a constantly adjusting price.
If you do not feel @randowhale is fair, please do not use the service. Using the service then complaining when you don't "profit" is not beneficial for anyone.
Please check to see if @randowhale is awake or sleeping before you send funds, no need for unnecessary transactions on the blockchain. If you go to https://steemit.com/@randowhale you will see the status of @randowhale right at the top.
Help can be obtained at https://steemit.chat/channel/randowhale
Upvotes on @randowhale comments and posts help build randowhale to have stronger votes for you!

Also you can install the RandoAwake chrome extenion to be notified when the bot is awake.

As a friendly reminder please do not use Randowhale upvotes for shity comments in bulk.This may get you blacklisted and might attract some nasty downvotes.

@bellyrub

------------Send .5 SBD or more to get a part of the pie.-----------<

First of all @zeartul, the creator of @bellyrub is a witness if you want to share one of your 30 votes,please do so

@bellyrub opened his service on july 15th, 2017

I was using Bellyrub since the bot was a small dolphin and i always got profit,sometimes x2 ,sometimes x2.5.@Bellyrub now has a bigger belly and gets bigger every month so you can have a substantial profit on your posts.

@zeartul also runs some contest, if you win you can get an extra slice of pie

I'll quote some text from this post demonstrating how Bellyrub works:

A Vote Bidding Bot enables you to place a Bid on a partial Upvote of it´s full strength. To always guarantee a 100% Vote being split among all Bidders it will only vote once every 2.4 hours. So let´s say your Bid equals 5% of the all Bids within the same 2.4 hour window, then you´ll receive a 5% Upvote respectively.

Due to the way Vote Bidding Bots work you´ll most probably never get a second Upvote of exactly the same strength. The Vote Value you´ll receive fully depends on the total Bids submitted and the height of your Bid respectively.

In order to make this all a little easier, let´s have a look at an example for @Bellyrub.

An Example for @Bellyrub!
Like mentioned above it all starts with the Vote Bidding, which is always open for about 2.4 hours. In our example there are three Steemians submitting a Vote on their Post. Alex transfers 5 SBD, Max throws in 3 SBD and Julia another 2 SBD. The whole Pot of this Voting Round therefore adds up to a total of 10SBD.

As soon as @Bellyrub reaches 100% Voting Power, the Bidding for this Round will be closed and the votes for all Participants will be calculated, which is illustrated in detail below.

Basically @Bellyrub only splits it 25$ Upvote among all Bidders according to the height of their submitted vote respectively. So in our Example Alex got a Bid of 5 SBD, which equals 50% of the whole Bid Pot and therefore he´s entitled to receive a 50% Vote on his Post, which was mentioned in the Memo of his transfer to @Bellyrub.

@Buildawhale

Bid at least 0.50 SBD and get a vote for 0%-100% with 100% voting power. Rounds last: 2.4 hours. All submissions considered for our daily Curation Digest

@Themarkymark ,creator of @Buildawhale is also a witness, if you want you can use one of your 30 votes to vote for him,i sure did(my first witness vote)

So why should you use BAW upvote bot?
Here is @nicnas telling you why :

The general reason to use BAW is more than evident for most. You place a bid and you will receive a share of one 100% upvote per ⌛ bidding round ⌛. He has always strived for, and I am sure will continue to, to make sure everyone gets as much profit as possible. That's why he continues to add Steem Power delegations to help this. He has lost a lot of his own money making sure the windows are fair.

A second reason for using BAW is for the gain in reputation from the upvote. So now you are getting your money back, in most cases, and also getting some reputation value too. But wait there is more...

Curation. So now you have placed a bid for the bot. Received an upvote and boosted your rep you also have a chance to be curated and placed into one of the Mon-Fri curation digests. Now this all depends on your content. Not how much you bid, just that you bid on that particular article. Bare in mind that the curators all have their own perspective on "good content."

If some problems ocured with your upvote or do you have some questions, @themarkymark is a nice guy and will sure help you with your problem.You can find him on discord or steemit chat .He's been a real help when i tried to set up my own bot and could not manage to resolve some issues.

@Minnobooster

This is what i usually use.At full 100% power minnowbooster can get you can get up to 3 times your investment back.

So what can MINNOWBOOSTER do for you?!

What?	Currency	Advantages
Buy upvote	SBD	Earn an instant return
Lease SP from market	STEEM	Increase your vote strength and curation rewards
Delegate SP to market	STEEM POWER	Earn daily STEEM dividends
Invest STEEM in MinnowBooster	STEEM	Earn daily SBD dividends
Delegate SP to MinnowBooster	STEEM POWER	Earn daily SBD dividends
Sell your vote to MinnowBooster	VOTING POWER	Earn SBD share of sells

I'll quote some text from this post by @minnowbooster, posted 3 months ago, to learn some things about the minnowbooster project and what it stands for

The @minnowbooster bot project is the "Swiss Army Knife" for minnows, which can do a multitude of things. It is a vote bot similar to @randowhale, except with a predicible upvote return in proportion to your spending.

In addition to the upvote bot feature, @minnowbooster is an ATM for Automated Delegated SP Leasing, providing minnows with the much needed STEEM POWER BOOST to be able to have a greater influence and effect on the platform. Kind of like leasing a Ferrari for a week, you can similarly lease delegated SP and become a dolphin or whale for a week to accelerate your reputation and esteem in the community.

This service has some daily and weekly limits so be sure to check out https://www.minnowbooster.net to learn more.

@Boomerang

like booster and bellyrub Boomerang votes 10 times a day with an aggregated vote weight of 100 percent. In adition to the Upvote feature you cand earn some extra SBD by delegating Steem Power to the bot.
Here is a post from Boomerang showing you how it works.

SBD Distribution
@boomerang will distribute the SBD 10 times a day (directly after every voting round) to the STEEM POWER Delegators. The payout is distributed in proportion to the amount of the SP delegation.

Example: 4 users have delegated in total 10000 SP to @boomerang. If user C has delegated 1000 SP to @boomerang, he will get 10% of the total SBD distribution.

Curation Rewards Distribution
@boomerang will distribute the curation rewards depending on the total amount of SP delegations, for details see the table.

How to join
If you want to join the @boomerang bot, just delegate any amount of STEEM POWER to @boomerang. You can do this by using the Vessel Desktop App from @jesta, or via steemconnect from @busy.

@discordia

Vote Bot ONLINE : 2.4 hr bidding rounds, vote weight 0-100% at 100% power, 0.1 SBD suggested minimum bid, commenting disabled, no refunds , Hail Eris !

I've been using discordia when i wanted to get more visibility on my comments,as the bot does not reply when upvoting.If value of SBD sent was bellow 0.5SBD i got some profit,but that off course depends of the current voting window investments.Always look at the current transaction when biding for an upvote, when using all of the above boosters .

@treeplanter

One upvote bot i've seen people use in my journey through steemit roads is @treeplanter.

PLANT TREES AND GET PAID FOR IT! 0.1 – 0.25 STEEM/SBD to @treeplanter + link in memo = vote approx. 1.5 times your donation. $1 = TREE

Love the project ideea behind this litlle upvote bot.So you get to see your post value go up and also have a chance to help the people behind the bot, save the forest.
The project goal is to plant 1,000,000 trees in three years! Let's all do our part.You may not get x3 profit, but you can help achive their goal.Every cent maters

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Links

• https://steemnow.com/ to calculate upvote value at 100%
• Visit https://www.minnowbooster.net/ for more features and informations
• Steem.cool/booster to see @booster curent investments

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I have not tried all of the above bots, i offer no guaranties you will get profit.Always do some research before.If i have made a mistake,ate some letters,or i've got my facts wrong, please forgive me as it is late,i'm tired as this post took me almost 4 hours to make

As always, have a great day