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Subject A/B generator
Writing the subject line is often the hardest part of a campaign, so RelyAI gives you a head start right where you need it. In the campaign editor, a Suggest button sits next to the subject field. Click it and RelyAI generates four distinct subject-line variants for your campaign, each tagged by the angle it takes.
RelyAI → Campaign editor → subject field
The four angles
The variants aren't four rewordings of the same idea — each one leans on a different psychological angle so you can compare genuinely different approaches:
| Angle | What it plays on |
|---|---|
| Curiosity | An open loop that makes readers want to know more |
| Benefit | The concrete payoff for opening |
| Urgency | A reason to act now |
| Question | A direct question that invites a click |
| Number | A specific figure or list to anchor attention |
| Personalization | A line that speaks to the recipient directly |
Each suggestion is labelled with its angle, so you can pick the one that fits this send — or run a proper A/B test with two contrasting angles.
How to use it
- Open the campaign editor and click Suggest beside the subject field.
- Read the four angle-tagged variants.
- Click a variant to drop it straight into the subject field.
- Edit it further if you like.
Nothing about the campaign changes until you save it. Generating and even clicking a variant only fills the field in the editor — the suggestion is a starting point, not a commitment, so you're always in control of what actually goes out.
Pair it with rewrite
Chosen a variant but want to nudge the tone? Select it and use the sparkle (✦) popover to make it shorter, friendlier or more formal.
Related pages
- Universal rewrite — refine a chosen subject line in place
- Coaches — the campaign coach for preheaders, send times and A/B-split math