The short version
Choose Mailbox Power if your business runs on nurturing a known list of relationships (past clients, referral partners) with birthday cards, holiday touches, and physical gifts. Choose StampSherpaif you want to acquire new customers with designed postcard campaigns to neighborhoods and lists, and you want each campaign’s response measured.
What Mailbox Power is
Mailbox Power is a personalized mail and gifting platform aimed at realtors, mortgage and insurance professionals, and service businesses. As of July 2026 its published plans run $99.99, $199.99, and $399.99 per month (with annual discounts), each bundling monthly product allowances (greeting cards, postcards, even coffee mugs), birthday and anniversary automations, dynamic QR codes, and an AI prospecting suite; postage is billed per piece (65 cents for small postcards, 82 cents for large and greeting cards). It is built around remembering people: the calendar does the marketing.
What StampSherpa is
StampSherpa is built around winning strangers: campaign postcards designed automatically from your website, sent to a neighborhood you circle on a map (EDDM saturation) or a list you upload, at flat monthly prices ($199 / $349 / $549, postcards and postage included). Six fresh designs generate monthly, and every card carries a per-campaign scannable code with responses charted per send. It does not ship mugs. It fills the top of the funnel and proves it with scans.
Side by side
| Mailbox Power | StampSherpa | |
|---|---|---|
| Core job | Keep-in-touch: cards + gifts to people you know | Acquisition campaigns to people you don't |
| Published pricing (July 2026) | $99.99 / $199.99 / $399.99 monthly + postage per piece (65-82¢) | $199 / $349 / $549 monthly, postage included |
| Signature move | Birthday/anniversary automations, gifting | Circle a neighborhood on a map, send jumbo cards |
| EDDM / saturation | Not offered | Core feature |
| Design | Personalized templates you configure | AI-designed from your website, refreshed monthly |
| Tracking | Dynamic QR codes available | Per-campaign QR standard + response dashboard with a 25-card rate floor |
| Typical buyer | Realtors, mortgage, insurance | Local service businesses, practices, restaurants |
Choose Mailbox Power if
- Your revenue comes from referrals and repeat clients you already know by name.
- You want automated birthdays, closings, and holiday touches, sometimes with gifts.
- You are in the realtor/mortgage/insurance world it was built for.
Choose StampSherpa if
- You need new customers from the neighborhoods around your business.
- You want campaign-level response data, not just sent confirmations.
- You want design handled completely: paste your website, approve, send.