LettrLabs ‑ Direct Mail vs UnDigital
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for LettrLabs, Oct 14, 2026 for UnDigital.
The short answer
- LettrLabs lists 14 features UnDigital’s listing doesn’t mention, including AI copywriting, AI images and video, AI optimization.
Head to head
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Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureWe work with all e-commerce businesses to help them stand out and drive an incredible marketing ROI through automated direct mail applications. Along with beautiful printed postcards, we specialize in authentic, robotic, handwritten direct mail. Show your customers that they are valuable to you with a pen-inked card in a pen-inked envelope with a real stamp.
Build loyalty and revenue when you use UnDigital’s Unboxing Experience Platform to add beautiful, personalized, and trackable marketing inserts to each of your outgoing packages.
- Send handwritten and printed mail directly to your customers.
- Automatically target your Shopify customers based on segmentation and events.
- Analytics - Get a clear view of ROI and direct mail engagement from outreach.
- Audience targeting
- Personalized print marketing
- ROI analytics
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  LettrLabs |  UnDigital |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | LettrLabs | UnDigital |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 1 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
LettrLabs and UnDigital: common questions
- What features does each app list that the other doesn’t?
- LettrLabs lists 14 the others don’t mention, such as AI copywriting, AI images and video, AI optimization, AI targeting. UnDigital lists 3 the others don’t mention, such as Behavior, Device, Keyword. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 13, 2026 for LettrLabs, Oct 14, 2026 for UnDigital; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 13, 2026 for LettrLabs, Oct 14, 2026 for UnDigital. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.