← Back to Blog

Unearth Diary #04: Does It Even Work?

This is the fourth in a series of articles where I discuss my long-time side project, Unearth. Unearth is a service that surfaces users' Reddit saves using personalized emails at the frequency of their choice—think of it like Timehop for Reddit saves.

A Poor Man’s Attempt at Determining User Sentiment Based Solely on Email Metrics

It's an interesting (though mostly unsettling) feeling when the product you made no longer seems to be working, at least not as you had intended. That's how I feel with Unearth. Its goal seemed simple: surface the hundreds of things I had saved on Reddit and assist me with removing some of that content.

As much as I hate to admit it, it seems as though Unearth doesn't work; at least not for me personally. I would often ignore the Unearth emails entirely and rarely would I click any of the links in the email if I did open it in the first place. I started to catch on to the fact that Unearth wasn't as useful as I had wished when I found myself deleting my own personalized emails as soon as they hit my inbox. But then people told me it was a cool idea, so maybe I am just the odd one out.

Without talking to my users directly, it's hard to tell. I wonder if the numbers paint a different picture? As a naturally-curious individual, I set out to determine Unearth users' sentiments towards the platform based solely on the email metrics provided by Sendgrid.

Email Metrics

Full disclosure: I connected Unearth to Sendgrid on around October 20, 2019. At that time, there would have been only ~2 users/accounts: my own and my girlfriend's (basically a test account). I'm not going to try and remove those numbers from the coming metrics since the test account basically went unused and I consider my account as an actual Unearth user.

They say a picture is worth a thousands words, so I'll just drop a screenshot of my Sendgrid dashboard containing the most relevant information.

Sendgrid stats dashboard for Unearth since its inception.
Sendgrid stats dashboard for Unearth since its inception.

So what do these graphs and numbers tell us? I'm not entirely sure myself. From the little research I've done so far, I have learned there are several key performance indicators (or KPIs) that are beneficial in understanding how well one's emails are doing. As I mentioned earlier, because Unearth's emails and their contents are personalized to the receiver, I'm not sure how applicable these KPIs are for measuring Unearth's success. We'll run with them anyways.

The KPIs we'll be examining in this article are as follows:

  • open rate (OR): "number of emails opened compared to the total amount delivered"
  • click-through rate (CTR): "number of clicks on the links"
  • click-to-open rate (CTOR): "number of clicks with respect to the number of openings…measuring the level of interaction"

Using the stats obtained from Sendgrid, let's calculate the aforementioned KPIs for Unearth:

  • OR: 413 emails opened / 820 emails delivered = 50.37%
  • CTR: 118 unique links clicked / 820 emails delivered = 14.39%
  • CTOR: 118 unique links clicked / 413 emails opened = 28.57%


Without any reference, these percentages are useless. A little googling later and I found several resources that outline what "good" or the average KPIs are across various industries. According to Mailchimp (as calculated by their customers' campaigns with more than 1,000 subscribers), the average open rate is 21.33%. Compared to Unearth's roughly 50%, that seems pretty good on our part!

Likewise, they analyzed the average click rate to be a mere 2.62%. Remember Unearth's click rate is about 14%, again well above average.

Sendgrid determined the aggregate click-to-open rate in 2018 was 10.1%. Like the other two KPIs we've examined, Unearth beats this at a CTOR of about 29%.


As the subtitle suggests, this comparison between Unearth's KPIs and the average KPIs of Mailchimp's and Sendgrid's customers isn't exactly apples-to-apples. It does, however, give me faith that Unearth is still helping others even if it doesn't fit my own wants or wishes. At the end of the day, this research has proven to me the platform does in fact seem to be working and there is no reason to shut it down now.


Cedric Amaya

Written by Cedric Amaya, a software engineer who enjoys occasionally taking a break from coding to write about what is on his mind. You should follow him on Twitter.