Picture one of your customers on the bus. Her phone buzzes, and a line and a half of your message appears on the lock screen. Her thumb hovers over the screen, and in that one second she decides: tap, or swipe away.
Those one and a half lines are your subject line. WhatsApp has no subject field the way email does, but the lock screen preview does exactly the same job. Only more brutally, because messages from friends and family are sitting right next to yours.
Leave that first line to chance and you waste the most valuable space in the whole message. Get it right and every send does noticeably more work. Here is the toolkit.
Why the first line carries so much weight
WhatsApp messages get opened. The 98% open rate is real. But opened is not read, and read is not acted on. Between “glanced at it” and “tapped the link” lies exactly one thing: whether the first few words give the reader a reason to keep going.
Then there is the context. Your message is not sitting among other ads the way it would in an email inbox. It is sitting next to a voice note from their best friend.
Your message is not competing with other companies. It is competing with your customer’s best friend.
That is a high bar. But it is a reachable one, as long as the first line does three things: it is specific, it matters to the person reading it, and it sounds like a human rather than a brochure.
A practical trick: write the whole message first and deal with the first line last. The best hook is usually already in there somewhere, often in the third sentence, where you finally get to the point. Move it to the top and delete the warm-up.
Seven hook formulas you can copy
Each one comes with an example that you can adapt directly to your own business.
1. The real news. Simplest first: if something really is new, say so immediately. “The new weekly menu is up, and Thursday is your day.”
2. First name plus benefit. A name works when something relevant comes right after it. “Emma, your usual perfume is back in stock.”
3. The specific number. Numbers make things tangible straight away. “3 slots free this week, one of them Saturday morning.”
4. The everyday question. A question that catches the reader in the middle of planning. “Got a table sorted for Friday night?”
5. The countdown. An honest deadline gives a reason to act now. “Ends Sunday: 20% off all winter styles.”
6. The insider. The feeling of belonging to the inner circle. “You are hearing it first: Sunday brunch starts here in March.”
7. The seasonal cue. A hook the reader is living through right now. “The first warm days are on the way: time for a spring service on your bike.”
All seven have one thing in common: they promise something positive and concrete. You do not need scare tactics or manufactured drama. For short-notice promotions like flash offers, honest scarcity is plenty.
Openers you can save yourself
The failures are just as instructive.
“Dear Sir or Madam” is the quickest way to look out of place on WhatsApp. “We would like to inform you today that…” is eight words with no information in them. Three emojis before the first word, and the preview shows nothing but little pictures instead of your message. And then there is clickbait you do not deliver on: someone taps “You will not believe this!” once, finds an ordinary discount behind it, and next time they keep scrolling.
The rule of thumb: read your first line out loud and ask whether you would say it to a regular standing at the counter. If not, rewrite it.
How to find out what works with your contacts
Hooks are not a matter of taste. They are measurable. The simplest test: write two different first lines for your next promotion, send each to part of your list, then check your stats to see which version brought more clicks and replies.
Save the winning line to your templates. After a few rounds you build up your own hook archive, built around your customers instead of generic advice.
The bottom line
The first line is the bouncer of your message: it decides whether the rest gets a chance at all. Specific, relevant, human. That is the whole formula, but it has to be applied every single time. With SmartChat you are not writing those messages on your own: the AI builds newsletters and follow-ups from your website and hands you wording that only needs polishing - see the plans here.