Rewritten
1. We cut our work week by a day. Output went up.
2. The 4-day week experiment: 6 months of real data
3. Does a shorter work week actually work?
4. What 18% more output taught us about time
5. Last call: the 4-day week results are in
About this tool
Open rates live and die by the subject line, and it's usually the last thing writers think about after spending an hour on the actual content. This tool reads your newsletter body and generates five subject line options across different psychological angles — a curiosity gap, a direct benefit, a question, something personal, and one with urgency — each kept under 60 characters so it doesn't get cut off in an inbox. Compare a few styles instead of guessing which one phrase will get opened.
Frequently asked questions
Will all 5 options fit within typical inbox preview limits?+
Yes, each is kept under 60 characters, which covers most desktop and mobile inbox previews without truncation.
Can I combine two of the generated options?+
Yes, many writers mix elements from two options — for example, the curiosity angle from one with the specificity of another — to land on a final version.
Does it write a preview text line too?+
No, this tool focuses only on the subject line itself; preview text is a separate field you'd want to write to complement, not repeat, the subject.