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10+ ranked subject lines with open-rate scoring and paired preheaders.
An email subject line generator turns your email topic into a list of subject lines designed to get opened. The good ones score each line against open-rate signals: clarity, curiosity, length, spam-trigger density, and personalization fit.
This tool returns 10+ ranked lines per batch, scored on 7 axes including a 600-word spam-trigger check, with paired preheader text and cross-client emoji safety. Free for 5 batches per day with no signup. CoSchedule and HubSpot lock equivalent features behind paid plans.
Describe what your email is about. Two sentences is enough. Add audience and goal if you have them.
Curiosity, urgency, benefit-led, casual, or professional. Same topic, very different open rates.
Each subject line scored on 7 axes including spam-trigger words. Top 3 get a green star.
Each line scored on 7 axes: clarity, curiosity gap, length, urgency, personalization, spam triggers, and emoji density. Calibrated against the AWeber industry benchmark.
We test every line against 600+ known spam-trigger words. Lines that score above 60% in any one trigger get auto-rewritten and dropped.
Each subject line comes with a matching preheader (the gray text after the subject). Together they form the full inbox preview, scored as one unit.
We test which emoji actually render across iOS, Android, Outlook, and Gmail. Only the cross-client safe ones get suggested.
Type your topic in any language; the lines come back in that language. Length tuning still respects the inbox preview cap of each language.
Pick the campaign type (cold sales, newsletter, transactional, abandoned cart, re-engagement, product launch). The prompt adjusts to each context.
Save your tone, banned words, and signature phrases. Every batch then writes in your voice.
We do not store the topics you generate from. Sessions expire on browser close. Premium offers encrypted history.
CoSchedule limits non-paid use to one line score. We give you 50+ ranked subject lines every day. Most marketers ship 1-2 emails per week. This is plenty.
All 10+ lines render in a sortable list with score, length, spam risk, and predicted open rate. Sort by any column. Pick 3 for an A/B test.
Bad ideas get a red badge. We do not pretend every line is great. The scoring algorithm is open about what it weighs and why.
We do not log topics or generated lines. Run 100 brainstorms a day and nothing accumulates. Privacy first by default.
Cold outreach lines that get past spam filters and into the inbox. Personalization slots auto-marked so you can swap in {firstName}, {company}, {painPoint}.
Punchy lines that lift open rates 2-3 points week over week. Run 5 styles, A/B the top 2, learn what your list responds to.
Abandoned cart, win-back, post-purchase, and product launch templates. Each campaign type has its own line patterns that convert.
Casual lines that feel like a friend, not a marketer. Curiosity tone is the highest-converting style for community newsletters.
You sent a great email last week and the open rate was a depressing 14%. The body was strong but the subject line was generic.
You are launching a new feature on Tuesday and the subject line decides whether 50K subscribers click. You need 10 options to A/B test.
Your CEO sent you a draft that says 'Hello!' as the subject. You need to rewrite it without sounding like you are correcting them.
You are running a cold outreach campaign and 80% of your emails land in promotions tab. You need lines that read more personal.
You are sending a re-engagement campaign to a list that has not opened in 90 days. Standard lines will not move the needle.
You are pitching the same product to 5 personas and need a different angle for each so the same offer feels relevant to each segment.
| Feature | Molixa | CoSchedule | HubSpot | Mizy |
|---|---|---|---|---|
| Free daily limit | 50+ lines (5 batches × 10) | 1 line score/day | Limited free | 5 free posts/day |
| Open-rate scoring | 7 axes, calibrated | Yes | Basic | No |
| Spam-trigger check | 600+ words checked | Limited | No | No |
| Preheader pairing | Yes | No | No | No |
| Multi-language | 30+ languages | English only | English only | Limited |
| Campaign types | 6 (cold, newsletter, etc.) | Generic | Generic | Newsletter only |
| Cross-client emoji | iOS/Android/Outlook/Gmail | No | No | No |
| Brand voice profile | Premium | No | Workflow add-on | No |
| Privacy | No retention | Stored | Stored in CRM | Stored |
Free for 5 batches per day. 10+ ranked lines per batch. No signup. No card.
Generate subject lines nowThe Email Subject Line Generator page is built, reviewed, and maintained by the Molixa team. We use the tool we ship and update the docs when the behavior changes.