Checklist
Survey email subject line checklist
A nine-point checklist for writing and testing survey invitation subject lines. It covers length, personalisation, question framing, honest time estimates, the spam words to avoid and how to run a fair A/B test. Use it on every feedback, NPS or churn survey email before you send. A subject line only wins the open, so pair it with a survey worth finishing, such as a short Koji interview that follows up on interesting answers.
Where this appears
What's in this checklist
- Keep it short: 2 to 4 words where you can
- Use their first name, plus the product, order or feature you mean
- Ask a real question the reader can answer
- Put the effort in numbers: 3 questions, 2 minutes
- Make the survey as short as the subject line promises
- No emojis, ALL CAPS or stacked exclamation marks
- Leave out urgent, ASAP, limited time, free and guaranteed
- A/B test one change at a time, a few hundred people per variant
- Pick the winner on completions, not just opens
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<a href="https://www.koji.so/visuals/survey-email-subject-line-checklist"><img src="https://www.koji.so/visuals/survey-email-subject-line-checklist/survey-email-subject-line-checklist.png" alt="Checklist of nine rules for survey email subject lines, from keeping them to 2 to 4 words to judging A/B tests on completions, not opens." width="1080" height="1080" /></a>
<p>Source: <a href="https://www.koji.so/visuals/survey-email-subject-line-checklist">Survey email subject line checklist</a>, Koji</p>
