How accurate are email subject line tools, really – venngage static electricity in the body effects

I created email subject line categories to test the tools’ own possible biases. I wanted to know, do these tools only understand salesy language as drivers of high open rates? Or can these tools evaluate any set of phrases and rank them accordingly.

I put together a list of contacts for completely cold email outreach. Truthfully, I didn’t want to spend a small eternity on this experiment. So instead of testing 27 different email subject lines on over a thousand people, I chose five specific ones to test on about 120 people.

I chose email subject lines that were ranked very differently by each tool. This helped me determine if the tools were indeed accurate, understood what makes something click-worthy , or were all hopelessly random. I also wanted to see if numerous approaches to crafting an email subject line can have positive results.

CoSchedule was fairly accurate with email subject lines 2, 3 and 4. The open rate percentage of each email very nearly corresponded with CoSchedule’s ranking of the email subject lines. However, it was pretty off with email subject lines 1 and 2.

Subject Line was not very helpful as a predictor of email subject line performance. Whether I got an open rate of 75% or 35%, its ranking only fluctuated by 9 points. Email subject lines 2 and 3 both got 50% open rates, yet their ranking in Subject Line varied quite a bit. All in all, Subject Line is a poor indicator of email subject line quality.

One recipient saw the “I’m a copywriter, yadda yadda” message and assumed it was a guest post pitch. She replied, realizing I was testing email subject lines, letting me know that she only opened it thinking it was a guest post pitch. Email subject line 4

You’ll recall, I mentioned who I am and where I work in the body of the email. Well, one person recognized the company name. She knew Venngage because she attended Inbound17 and saw our marketing director, Nadya Khoja, speak. So, without meaning to, I skewed the results.

In addition, the time that an email gets sent affects open rates. I sent the emails between 2PM-3PM on a Tuesday. Our own study on the best time to send an email newsletter showed that sending an email between 2PM-3PM is ideal. However, Tuesdays is one of the worst days to send an email.

The tool clearly has a built-in formula for the ideal email subject line. It considers character and word range, word lengths, word uses, emoji uses and more, to determine how effective the email subject line is. That tells me it follows a specific formula. However, it just did not accurately reflect my best-performing email subject line with its score. Subject Line

Yet, the experiment shows that even email subject lines that performed poorly rank high in Subject Line. It begs the question, if poorly-performing email subject lines rank high in Subject Line, then what’s the purpose of achieving a high rank? Net Atlantic

If you’re struggling with writing impactful, enticing subject lines, you can also start by looking at some best practices. This lets you set a foundation for yourself to improve upon in the future (using CoSchedule’s tool or another approach). Writing better subject lines

This particular finding is validated further in other studies, including a cold outreach email study by Klientboost . The simple email subject line, “Hey there [FIRST NAME]!” was tested and saw open rates over 30%. “Free” doesn’t always help

Our study on the best number to use in a blog title found that the number 10 attracts the most attention. Numbers like 7, 5, 4 and 3 are also popular. Blog titles are certainly different from email subject lines, but this tells us that things like numbers alone can influence someone’s interest. Conclusion