STEP 1

Open your favorite browser on any site (I strongly recommend to use Brave browser)
and open the DevTools (Ctrl + Shift + J on Linux/Windows and Cmd + Opt + J on Mac)

STEP 2

Open 2 tabs:
https://cdn.jsdelivr.net/npm/steem/dist/steem.min.js (SteemJs)
https://unpkg.com/[email protected]/dist/dsteem.js (Dsteem.js)
and copy and paste (Ctrl + A and Ctrl + C) the content of both pages into the Browser Console (DevTools).

STEP 3

Copy and paste my script below in the Console:

var USERS_TO_CHECK = ['cribbio', 'gasaeightyfive', 'marcocasario', 'gaottantacinque'];

var results = {};
var maxes = {
 balances: {
  sp: { user: null, value: 0 },
  steem: { user: null, value: 0 },
  sbd: { user: null, value: 0 },
 },
 followers: { user: null, value: 0 }
};

var client = new dsteem.Client('https://api.steemit.com');


var getAccounts = (username) => new Promise((resolve, reject) => {
 steem.api.getAccounts([username], (err, result) => {
  if (err) reject(err);
  else resolve(result);
 });
});

var getProps = () => new Promise((res, rej) => {
 steem.api.getDynamicGlobalProperties((err, result) => {
  if (err) rej(err);
  else res(result);
 });
});

var getSteemPower = (username) => {
 return Promise.all([
   getAccounts(username),
   getProps(),
 ]).then(([user, globals]) => {
  const totalSteem = Number(globals.total_vesting_fund_steem.split(' ')[0]);
  const totalVests = Number(globals.total_vesting_shares.split(' ')[0]);
  const userVests = Number(user[0].vesting_shares.split(' ')[0]);
  return totalSteem * (userVests / totalVests);
 });
};
// const sp = await getSteemPower('cribbio');

var getBalances = (username) => new Promise((resolve, reject) => {
 steem.api.getAccounts([username], (err, [{ balance, savings_balance, sbd_balance }]) => {
  if (err) reject(err);
  else resolve({
   steem: +balance.split(' ')[0] + +savings_balance.split(' ')[0],
   sbd: +sbd_balance.split(' ')[0],
  });
 });
});
// getBalances('cribbio').then(console.log);

var getFollowers = targetUser => new Promise((resolve) => {
 const options = [
  targetUser,
  '',
  'blog',
  1000, // MAX 1000 results :(
 ];
 client.call('follow_api', 'get_followers', options)
  .then((result) => {
   resolve(result.length);
  });
});
// getFollowers('cribbio').then(res => console.log('followers: ', res));


var getInfo = (user) => {
 return Promise.all([getSteemPower(user), getBalances(user), getFollowers(user)])
  .then(([res1, res2, res3]) => ({
   steemPower: res1,
   balances: res2,
   followers: res3
  }));
};

var run = async () => {
 for (let id = 0; id < USERS_TO_CHECK.length; id++) {
  const currentUser = USERS_TO_CHECK[id];
  const currentInfo = await getInfo(currentUser);
  results[currentUser] = currentInfo;
  const { steemPower, balances: { steem, sbd }, followers } = currentInfo;
  if (steemPower > maxes.balances.sp.value) { maxes.balances.sp = { user: currentUser, value: steemPower }; }
  if (steem > maxes.balances.steem.value) { maxes.balances.steem = { user: currentUser, value: steem }; }
  if (sbd > maxes.balances.sbd.value) { maxes.balances.sbd = { user: currentUser, value: sbd }; }
  if (followers > maxes.followers.value) { maxes.followers = { user: currentUser, value: followers }; }
 }
 console.log({ results, maxes });
};
run();