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24. We've compared the top 5 [products/services] so you don't have to
Providing valuable, time-saving information is a great way to grab the recipient's attention and make decision making easier.

This subject line promises a useful comparison of the best options in a given category. It attracts recipients looking for effective, reliable recommendations.


This subject line offers a friendly, non-intrusive invitation for cold emails or networking. It encourages casual, valuable interaction rather than a hard sell, which can attract potential architects email list contacts or clients.

You can also use this theme for an exclusive offer, events or webinars. After all, personalized invitations make recipients feel special and appreciated.

Best Practices for Writing Click-Worthy Email Subject Lines
Writing catchy subject lines for your email marketing campaigns can make the difference between your message being opened or ignored. Here are some tips and tricks to follow:

Keep it short : The best subject lines are usually short and concise. Aim for around 40 characters or less to ensure your subject line is fully visible on mobile devices. This brevity forces you to focus on the most compelling aspect of your message.
Use Power Words : Include strong, action-oriented words that evoke emotion or urgency. Words like “exclusive,” “limited,” “secret,” or “breaking” can grab the reader’s attention and encourage them to open up. The same goes for action-oriented verbs like “discover,” “learn,” or “save,” which convey a clear call to action .
Ask intriguing questions : Ask questions that pique curiosity and encourage recipients to open the email for answers. Make sure the content of the email matches the promise implied by the question.
Create a sense of urgency : Without making false promises, use time-sensitive language to encourage immediate action. Phrases like “ending soon,” “last chance,” or “only 24 hours left” can be effective for sales emails.
A/B testing your subject lines : Regularly test different subject lines to see what resonates best with your audience. This data-driven approach can significantly improve your e-commerce email marketing performance over time.
Consider Preview Text : While it may not be part of the subject line, preview text (or preheader) works in tandem with it. A preheader is an additional line of text that appears either below or next to the subject line in some email clients. Use it to provide additional context and encourage clicks.
Addressing pain points : Research and analyze your audience’s problems thoroughly so you can create topics that promise solutions. This shows that you understand their needs and have valuable information to share.
Optimize for mobile : Make sure your subject lines are readable on mobile devices. People are increasingly checking their emails on their smartphones, so optimizing for smaller screens is important.
Avoid spam triggers : Avoid using excessive exclamation points, capital letters, or spam language. Words like “guarantee” and “free” can trigger email filters. While this isn’t always a problem, overusing them can hurt deliverability.
Test emojis strategically : Emojis can add visual appeal and help your topic stand out, but use them judiciously. Make sure they match your message and are appropriate for your audience.
Frequently asked questions
Q1: What is the best subject line for an email?

The best subject line resonates with your specific audience and is relevant to the content of the email. It should be concise, clear, and compelling.

While there is no one-size-fits-all approach, effective email subject lines often spark curiosity, offer value, or address pain points.

Q2: What email subject lines are opened most often?

Email subject lines that emphasize urgency, personalization, or curiosity tend to be effective.

For example, the phrase “Last chance: your discount expires at midnight” creates a sense of urgency, while the phrase “John, we picked these items just for you” uses personalization.

Curiosity-driven lines like “You won’t believe what we found…” can also boost open rates. Be sure to test different approaches with your specific audience.

Q3: How can I check which email subject lines work best for my audience?

Conduct A/B testing to determine the best subject lines for your target audience. Create two versions of the subject line and send them to small random samples of your email list.

You want to test different elements in sequence — length, tone, personalization, or emojis. Send the version that performs better and has higher open rates to the rest of your list.

Q4: What are some common mistakes to avoid when writing an email subject line?

Some common pitfalls that can hinder effective email subject lines include using excessive exclamation points, capital letters, or spam language. Additionally, vague or misleading subject lines can frustrate recipients and damage the sender's reputation.

Q5. Does the subject line of an email affect the open rate of an email?

Of course. The subject line is often the deciding factor in whether your email will be opened or ignored. It's your first (and sometimes only) chance to grab the recipient's attention in a crowded inbox.

A well-written subject line can significantly increase your open rate, while a poorly written subject line can result in your email being ignored or marked as spam.

Conclusion
Email subject lines can make or break your marketing campaign. We want your campaign to be successful.

With the right subject line, you can set the stage for the content of your email and convince even a skeptical recipient to open your message. The best email subject lines not only increase open rates, they also increase the likelihood of click-throughs, which is ultimately your goal.

What makes a great email subject line? It should be compelling, relevant, and engaging enough to keep your audience interested. From personalization to creating urgency, the strategies we’ve covered will help you craft compelling subject lines.

Use Hello Bar to increase your email signups, then apply our tips and examples to create subject lines that resonate with your audience. With practice and testing, you'll soon learn how to create engaging subject lines that get results.