Cold Email Subject Lines That Get Opened (25 Examples)
·6 min read
The subject line decides whether any of your work gets seen. For cold email, the winners are short, specific, lowercase-ish, and curiosity-driven — they read like a note from a colleague, not a campaign.
Five rules for cold subject lines
- 1Keep it under ~5 words. Long subjects scream 'marketing.'
- 2Reference something specific to them, not you.
- 3Avoid spam triggers: ALL CAPS, !!!, 'free', '$$$', 'guarantee.'
- 4Lowercase or sentence case beats Title Case — it feels personal.
- 5Never clickbait the open you can't pay off in the body.
25 subject lines to adapt
- quick question about [company]
- your new pricing page
- idea for [company]'s demo funnel
- re: your careers page
- two SDRs and a repricing
- before your reps ramp
- [first name] — 15 min?
- speed-to-value at [company]
- noticed something on your site
- your after-hours calls
- [competitor] does this, you don't
- reply rates at [company]
- one line for your outbound
- saw the [logo] case study
- worth a quick look?
- [company] + faster intake
- the leads that don't book
- small idea, big lift
- your homepage hook
- a note on your free trial
- 10 minutes on [topic]?
- found a gap on your pricing page
- for the next 90 days
- quick one re: [service]
- did I read your site right?
Subject lines and openers should agree. If the subject says 'your new pricing page,' the first line had better be about the pricing page.
Generate five per prospect, automatically
HookForge returns five subject-line options with every run — pulled from the same evidence as the hooks — so you can A/B the angle without writing them by hand.
Write the hook in seconds, not minutes
Paste a prospect's URL and HookForge drafts 3 grounded hooks and 5 subject lines from their live site.
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