You may be able to improve with some tweaks.
A measure of how easy-breezy it is to read your subject line. Don't shy away from using well known industry specific terms, just don't make it complicated.
Reading Grade Level is a mixture of word choice, complexity and length. Writing at a lower level tends to generate more opens.
How many words in your subject is less important than the right words. Keep it specific. Focus on what your reader will get out of opening this email.
Just don't make it too short (hurts opens) and if you go long, try and put multiple CTAs or value propositions into the subject.
Make sure this preview reads well on Desktop and mobile.
Sentiment scores below -0.25 are negative and above 0.25 positive. Most emails 76% are Positive or Neutral.
Putting a fake RE: or FWD: at the beginning of your subject may temporarily boost open rates, but is not recommended unless you're actually responding to an email. Many email clients and anti-spam systems have begun flagging these as suspicious..
Spammers and low rent marketers have so over used `Free` in email subject lines that it's best to avoid it if at all possible.
Obviously there are words and phrases found more often in spam emails. While using these won't automatically put your email into the spam bin, it's best to avoid them if you can.
Sometimes added to give a sense of urgency to your email, these word choices are likely to work gainst you. Often they'll push your email from the Primary to the Promotions tab in Gmail and generally hurt open rates.
Exclamation marks tend to hurt open rates and Gmail tab placement, avoid them.
Subject lines with all cap words both look like they're shouting and like you are a spammer.
Swearing like a cartoon sailor isn't something you should aspire to, in life or your subject lines. Recommendation: Remove some punctuation from your subject.
If they do any personalization, most marketers stop at 'Hey FNAME' - but personalization can both be much more and much more effective.
Idea: Try personalizing your subject with name, industry, title, interest, or geograpic info.
If you're struggling with creating a compelling subject line, try a question. They're more naturally engaging and typically result in higher open rates.
Idea: Try rephrasing your subject as a query to increase engagement.
Lowercasing your entire subject is a stylistic choice that can make your subject stand out in a crowded inbox. It can be a good way to signal that it's a more personal, less corporate message.
Idea: Try making your subject less stiff by lowercasing it.
Thowing a few topical emoji into your email's subject line is an easy way to catch the eye. Copy and Paste from GetEmoji.com