At UM Systems we collaborate with influencers and pages a lot for brand awareness and product promotion. We believe Mango Score calculator is a real goldmine for any brand or marketer who wants to do effective influencer marketing and boost their brands' visibility, as we did during our recent campaign.
What I like about this tool is that on top of providing accurate engagement rate data, it shows other metrics, which are generally underestimated but are no less important for ensuring a high ROI and exposure to brands.

I've been in the digital marketing field for three years already and deal with influencers really often. I found Mango Score Calculator by accident and happy for that ) It makes the process of understanding if an influencer is good or not very easy and intuitive.
Also I'd like to mention that I am a huge fan of the newsletters Viralmango team sends out weekly with practical tips and strategies. Keep up the good job!