Turn your happiest customers into your best sales channel. Edit a headline, a refer-a-friend offer, a call-to-action and a QR code, then mail it — with optional front-desk follow-up calls. Start on the free plan, no credit card required.
Start Free — No Credit CardWord of mouth is your cheapest growth channel — but most happy customers never refer anyone simply because no one asked. A physical postcard does the asking for you: it lands on the counter, it's easy to hand to a friend, and a two-sided offer (a thank-you for the referrer plus a welcome deal for the new customer) gives both people a reason to act. Pair it with a quick follow-up call and "I keep meaning to tell my neighbor about you" becomes a booked appointment.
Your loyal customers are your warmest list. Export them from your existing system as a CSV and import the file into PostKnock — the import wizard auto-maps the columns. No CRM connection needed; it's a simple CSV upload.
A postcard is a physical object customers can actually pass along, pin to the fridge, or keep in a wallet. A QR code makes it one tap for the friend to book or claim the offer — far easier to share than an email they'd have to forward.
A referral postcard plus a friendly follow-up call from your front desk a few days later (the built-in Call Queue, a Pro feature) consistently outperforms either channel alone. PostKnock sequences both for you.
Referral response and ROI vary widely by industry, offer, and how engaged your customer list is. Any figures should be treated as estimates, not PostKnock results.
Each is a 4×6 front design with an editable headline, refer-a-friend offer, call-to-action, and a real QR code (link it to your booking page, referral form, or phone number). Open any one in the Design Studio and make it yours — for free.
Bright Smile Dental
Refer a friend or family member to our practice.
You get $50 off — your friend gets a free exam
Reward loyal patients for sending friends and family, and give the new patient a reason to book their first visit.
Customize this free →Glow Aesthetics Med Spa
Love your results? Share them.
$40 credit for you & your friend on their first treatment
Give existing clients a credit for every friend they bring in, and welcome the new client with a matching offer on their first treatment.
Customize this free →Iron Works Fitness
Bring a workout buddy and you both win.
Refer a friend — get a free month, they join free
Reward members for bringing a workout partner, and drop the friction on the friend's first visit with a free-trial QR link.
Customize this free →Previews are illustrative mockups. Business names, offers, and results shown are examples only — edit every field in the Design Studio. Postcards print at 4×6, 6×9, or 6×11.
Open any design above in the Design Studio. Swap the headline, refer-a-friend offer, CTA, colors, and logo, and point the QR code at your booking page, referral form, or phone number.
Export your most engaged customers from your existing system as a CSV (sort by visits, spend, or tenure), then import the file. The wizard auto-maps name, address, and phone columns. PostKnock does not connect to your CRM directly — it's a CSV import.
Postcards print and mail via USPS First-Class, with QR-scan tracking built in. On Pro, layer in front-desk follow-up calls through the Call Queue and run a multi-touch wave sequence (up to 5 waves) from a pre-built playbook.
Customize templates and build campaigns for free. You only pay per piece when you send.
Single-wave postcard campaigns · Design Studio · QR tracking · From $1.05/4×6 piece
Everything in Free + Call Queue & multi-wave sequences · From $0.79/4×6 piece
Per-piece pricing includes printing + USPS First-Class postage, paid from your wallet. Pro is $99/mo or $799/yr. No setup fees, no minimums, no contracts.
More templates & industry pages
Yes. Editing any template in the PostKnock Design Studio is free, with no credit card required. You only pay per piece when you actually mail — from $1.05 per 4×6 card on the Free plan and from $0.79 on Pro. Printing and USPS First-Class postage are included in that per-piece price.
A clear two-sided offer works best: a reward for the customer who refers and a welcome deal for the friend they bring. Add a warm headline, your business name and phone number, and an easy next step such as a QR code to a referral form or booking page. Make the postcard something people will want to hand to a friend. Every field in these templates is editable.
Results vary by industry, offer, and how engaged your customer list is, so treat any number as an estimate. Industry studies (such as the ANA Response Rate Report) typically report direct-mail response in the low single digits, with house lists — like your own loyal customers — landing toward the higher end of that range. Pairing the postcard with a follow-up phone call generally lifts response further.
Each postcard carries a QR code you can point at your booking page, a referral sign-up form, or your phone number. PostKnock tracks QR scans, so you can see how many people engaged with a referral campaign. For attributing a specific friend to a specific referrer, send them to a form or page that captures that — the QR just makes it one tap to get there.
PostKnock includes pre-built playbooks and starting designs for 50+ industries — dental, med spa, gym and fitness, hair and nail salons, optometry, veterinary, chiropractic, plumbing, HVAC, landscaping, and many more. The three above are examples; you can adapt any template to your business in the Design Studio.
Export your loyal or most-engaged customers from whatever system you already use — sort by visits, spend, or tenure — as a CSV file, then upload that CSV to PostKnock. The import wizard auto-maps name, address, and phone columns. PostKnock does not connect to your CRM or practice software directly; the supported path is CSV export and import.
Yes, on the Pro plan. After a postcard is delivered, the built-in Call Queue populates so your front desk can work a daily list of follow-up calls using per-wave scripts — a great way to thank loyal customers and remind them about the referral offer. You can also run multi-touch wave sequences (up to 5 waves) so non-responders automatically advance to the next touch.
PostKnock supports three sizes: 4×6, 6×9, and 6×11. The templates above are shown at 4×6, the most common and lowest-cost option. You can switch sizes in the Design Studio, and EDDM-style saturation mailing is available when you want to blanket a neighborhood instead of a named list.
Customize a referral template free, then mail it — with optional follow-up calls.
Start Free — No Credit Card