Lock Screen Marketing: Reach Customers Without an App
Every week without a lock screen channel, a regular customer forgets you—yet the channel takes 5 minutes to set up, free up to 100 customers.
Lock screen marketing is the most direct path to your customers. A short message appears on the screen everyone checks dozens of times a day. The best part: you don't need your own app. The digital stamp card in the wallet brings the channel with it.
This article explains how it works, what the law requires, and which messages actually drive visits.
How messages reach the lock screen without an app
Apple Wallet and Google Wallet come preinstalled on nearly every smartphone. Both can send notifications for saved cards (called push notifications). That's the same technology that shows your boarding pass on the lock screen minutes before your flight.
Here's how it works:
- The customer scans your QR code and saves the card in their wallet.
- You write a message in the dashboard, or an automation triggers one.
- The card updates. The phone shows the change as a notification on the lock screen.
- A tap opens the card with the current stamp count and your offer.
No app download, no phone number, no email address. The card is the channel. For a customer's view of how card creation works, see What is a Wallet Pass?.
Why the lock screen works differently than email
The difference is attention. A newsletter competes with dozens of other emails. Many get archived unread. A lock screen message stands alone. It's short and appears the moment the customer looks at their phone.
| Channel | Customer needs | Visibility | Effort for you |
|---|---|---|---|
| Newsletter | Email address, opt-in | Lost in full inbox | Write text, design, send tool |
| WhatsApp Business | Phone number, opt-in | High, but personal | Maintain numbers, possible per-message costs |
| Own app | App download | High | App development, ongoing maintenance |
| Social media | Follows you | Depends on algorithm | Post regularly |
| Wallet message | Card in wallet, marketing opt-in | Lock screen | One sentence in dashboard |
There's a second effect: the message is tied to the card. The customer doesn't just see "2 for 1 today"—they also see "7 of 10 stamps." Offer and progress reinforce each other.
What the law requires
Lock screen messages with offers are marketing. You need the customer's consent. They give it when creating the card: a separate checkbox for offers and promotions, separate from program participation. The checkbox is unchecked by default.
Messages that are part of the program are not marketing:
- "You now have 8 of 10 stamps"
- "Your reward is ready"
- "Your reward has been redeemed"
Every cardholder can receive these.
Rule of thumb: Anything meant to encourage a purchase needs the checkbox. Anything about the card's status doesn't. The details are in GDPR and Loyalty Programs. Good software separates both types automatically. Marketing only goes to customers who opted in.
Messages that drive visits
Not every message works the same. Five types have proven effective in small shops:
Time-limited offer: "Free second coffee today until 6 PM." The deadline creates urgency to come in today.
Slow-day booster: "Tuesday is double-stamp day." Spreads visits to quiet days.
Win-back: "Haven't seen you in a while, Lena. Your next stamp counts double." Runs automatically for customers who haven't visited in 14 days.
Birthday: "Happy birthday! Your favorite drink is on us today." Personal and effective if the customer shared their birthday.
Almost there: "Just 2 stamps left for your free cappuccino." Reminds them of the reward coming up.
Less effective are generic messages without a reason ("Come by again") and long text. The message has one or two lines on the lock screen. Anything longer loses the reader.
Self-test: Is lock screen marketing right for you?
- Do you run regular offers or time-limited promotions?
- Are there slow days when more visits would help?
- Do you want to win back customers who haven't visited in a while?
- Do you collect birthdays or other personal occasions?
- Do you lack time for newsletters or regular social media posts?
Three or more yes? Then the lock screen channel is for you.
How often to send: the frequency question
The lock screen is personal space. Send too often and customers feel bothered. They delete the card. Then the channel is gone forever.
Proven frequency:
- Automatic messages (stamp updates, reward ready, win-back, birthday): run in the background, only trigger on real occasions.
- Your campaigns: 1–2 per week, ideally on a fixed schedule, like every Tuesday.
- Seasonal: in addition to holidays or season starts, no more than once a month.
Watch your dashboard to see if cards get deleted after a message. That's the most honest signal for "too much." Also remember: wallet providers limit notifications per card per day themselves.
Location-based reminders: the proximity effect
Wallet cards can also appear based on location. When a customer is near your shop, the card shows on their lock screen with a quick reminder. You don't send anything. It reminds them at exactly the right moment—like when they pass your café on the way to work.
This feature (called geofencing) is included in stampa's Growth plan and above. It uses only the wallet's location function. You never see the customer's movement data. The phone decides locally whether to show the card.
Writing messages: three rules
Use their name if you have it. "Hi Lena" reads different from "Dear customers."
One offer, one deadline, one sentence. Cut everything else.
Specific beats vague. "Free second cappuccino" beats "great offers."
If writing is hard: stampa's AI suggests message text. You accept it or edit it. More examples and templates are in Send Push Notifications to Customers.
What happens if you do nothing
Without a lock screen channel, you only reach customers when they think of you on their own. Newsletters get buried. Social posts may or may not show up. Meanwhile, regulars go to competitors who sent them a reminder. You never know they're gone because you can't see who doesn't come.
The lock screen is the only channel that appears at the right moment. Without it, you lose customers every week that one sentence could have brought back.
Conclusion
Lock screen marketing is the channel with the highest attention. With a wallet stamp card, you need no app or phone number. What matters is separate marketing consent, concrete messages with a reason, and a frequency that doesn't bother customers.
With stampa, you write campaigns in the dashboard or let automations trigger based on events. You can start free—up to 100 active customers, no credit card, set up in 5 minutes.