LettrLabs gives you two ways to track response to a mail piece: a scannable QR code on the card itself, and a dedicated trackable phone number. This guide covers what each one does, how to set it up, and — importantly — where you actually see the resulting data, since the two live in different places.
Trackable QR codes
A QR code on your card links directly to a URL you choose — your website, a landing page, a booking calendar, a social profile, or anything else. When you design your card template or order, add your destination URL in the Tracking & Attribution panel and click Generate. This creates a QR code you can resize or reposition anywhere on the front of your card. QR codes currently can't be placed on the back of a card.
After you enter your URL, you'll be prompted to scan the generated code with your own phone to confirm it goes to the right destination before you confirm it.
QR code analytics — the data that's actually visible in-app
Once your order is live, QR scan data appears directly in the order's recipient list: each recipient row shows a QR Scans count. You can sort by this column to see who's scanned the most, and the order's overview shows a summed total across all recipients. QR codes are dynamic and unique per recipient, so a scan always ties back to exactly who scanned it.
Trackable phone numbers — a different kind of tracking
You can also add a dedicated, trackable phone number to a card, provisioned through LettrLabs' call-tracking integration (CallTrackingMetrics). This lets you use a unique number per campaign so an inbound call can be attributed to the mail piece that displayed it.
Unverified → corrected: unlike QR scans, call activity on a trackable phone number does not show up as an in-app analytics view in LettrLabs — no call log, call count, or call-date list was found anywhere in the product. Call-level reporting (who called, when, how many times) lives in the call-tracking provider's own external dashboard, not inside LettrLabs. See the Setup Guide: CallTrackingMetrics and Using Call Data to Trigger Direct Mail articles in the Integrations collection for how trackable numbers are provisioned and used.
Choosing between the two
Use a QR code when you want response tracking that's visible directly in your LettrLabs order — no extra dashboard to check.
Use a trackable phone number when your audience is more likely to call than scan, or when a phone call-to-action fits your campaign better — just know that reviewing call activity means checking the call-tracking provider's own dashboard, not LettrLabs.
Many campaigns use both, printed together on the same card, so recipients can respond however's easiest for them.
A few things to keep in mind: it can take a minute or two for a large recipient list's scan data to populate, but individual scans register with no delay as they happen.