BOOK A FREE CALL
Back to Blog
a screenshot showing the mailmeteor email subject line tester

4 free email subject line testers (rated)

If you're looking to improve the effectiveness of your email subject lines, you might consider using 1 or more of the 4 tools I regularly use. These testers are useful, free, and super fun!

Each tester rates your email subject line somewhat differently, so I like to get feedback and ideas from multiple tools.

I took the following fundraising appeal subject line and entered it into each of the 4 testers:

⏳ Do you have 1 minute to protect wildlife?

Here are the 4 subject line testers in action:

🚀 Mailmeteor Subject Line Tester: Your Personal Brainstorming Bot Buddy!

This tool does two cool things. First, it gives you a score with an overview of areas for improvement.

Second, it has GPT-3 🤖 embedded into the form to give you 5 alternative email subject lines. I glance at each AI-generated suggestion for any new word choice or word arrangement that may sound better.


🚀 SendCheckIt Subject Line Tester: So Many Tips Here!

This is definitely one of the most helpful subject line testing tools I’ve found. It rates so many areas — like 17-ish 😮 — such as grade level, scannability, length, sentiment, emojis, personalization, and punctuation.

It not only tells you WHAT could be improved but it also tells you WHY.


🚀 Coschedule Subject Line Tester: Graphics Galore!

I like this tool because the results are presented in an info-graphics sort of way. It always seems to identify multiple areas of improvement — and even shows what your subject line will look like on multiple devices.

Plus: the tool cheers you along ("Hey, rock star" and "Getting c-l-o-s-e-r! “) which makes me smile big. 😄


🚀 SubjectLine Tester: My Favorite!

This rating tool is gamified, which makes it both informative and fun! You get points added or subtracted based on elements that meet industry standards for effective email subject lines.

I enjoy tinkering with my subject line to get a higher score. I feel a huge accomplishment when I get extra credit points that push my score over 100! (😂)

 

While you're here...

Why not read a little more?

Here are a few more blog posts you might like:

1. Thank You for the "Mental Real Estate"

2. You Can't Feel "Empty Urgency"

3. X-ray of a Donor Newsletter -- "Know Your Bones"

4. You Can't Get Donors to FEEL It If You Don't Feel It First

5. What to Put in Your Donor Newsletter

The Fundraising Writing Newsletter

Every week we send a letter about fundraising, writing, donors, and life to smart fundraisers like you.

We share fresh, practical donor communication tips and resources... and some silliness too.

It’s free. Unsubscribe whenever you want.

We love when good things arrive in our inboxes. If you do too, subscribe today.