📣
Precisd · Sector
MARKETING
26 tools available
Launch giveaway
$500 prize
Limited time
Social steps + rules in the full entry panel.
💡
Request a tool
Feedback or looking for a new tool? Request a new Marketing tool. Let us know what you are looking for or share any feedback, and get a chance to win $100 — always open for feedback. Submit now to enter for $100.
Ad space
✉️ Email subject A/B
Score two subject lines, predicted open lift heuristic
How this tool works
What it does: Score two subject lines, predicted open lift heuristic
How to use it
Read the short description under the title, complete the fields it lists, then use the main button on the page.
Inputs
Each field label explains what to enter; samples may be filled in so you can see an example—click a field to replace them.
Outputs
The tool shows where to read the answer (numbers, text, download link, or preview).
What you get
You get a single-purpose outcome (a number, a string, a file, or a checklist) without installing software.
Subject line variants (up to 5)
Industry
List size
Audience
Comparison table
| # | Subject | Len | Pred. open %* | Spam risk | Mobile 50-char |
|---|---|---|---|---|---|
| 1 | Spring sale ends Sunday | 7/10 | 31.0% | 100/100 | OK |
| 2 | You’re in — 20% off inside | 7/10 | 36.7% | 100/100 | OK |
| 3 | Quick question about your cart | 10/10 | 37.3% | 100/100 | OK |
* Modeled estimate from heuristics — not a guarantee.
Winner
Variant 3
Quick question about your cart
Highest composite score for predicted engagement under your industry preset.
Mobile preview (~50 chars)
1. Spring sale ends Sunday
2. You’re in — 20% off inside
3. Quick question about your cart
Recommended send time (static)
Peak windows often Tue–Thu late morning for promos; test weekends for lifestyle.
Best practices checklist (per variant)
Variant 1
- ○ 30–50 character sweet spot
- ✓ Avoid spam triggers
- ○ Includes personalization cue
- ✓ Single clear focus
- ✓ Not all caps shouting
Variant 2
- ○ 30–50 character sweet spot
- ✓ Avoid spam triggers
- ✓ Includes personalization cue
- ✓ Single clear focus
- ✓ Not all caps shouting
Variant 3
- ✓ 30–50 character sweet spot
- ✓ Avoid spam triggers
- ✓ Includes personalization cue
- ✓ Single clear focus
- ✓ Not all caps shouting
Ad space