The short answer: if you only want your own address rules enforced (PO Boxes, blocked countries, missing house numbers), Free does that for nothing — blocking at checkout or warning the buyer right after purchase, your call per rule. If you want every address confirmed deliverable against carrier and postal data — which catches wrong ZIPs, missing apartment numbers, and typos as a side effect — that’s Pro at $0.04 per order.
What Free includes
Free runs the rule engine on both surfaces. Every rule you set to Block at checkout is enforced before the order exists: PO Box detection, missing house numbers, malformed ZIPs, unusual characters, military addresses, Packstation, plus your country and ZIP blocklists. Each rule shows your own message at the address field.
Rules you set to Warn after purchase run on the thank-you page and Order Status page instead: the sale completes, and the buyer gets a card asking them to check the address, with an edit form to fix it on the spot. Flagged orders are tagged address-unverified (address-corrected once fixed) so they surface in your admin, and the dashboard counts every check.
What Free doesn’t do is verify. A rule can tell that “PO Box 92” is a PO Box. It cannot tell that “215 Clayton Stret, 94118” should be “215 Clayton St, 94117”, because that takes a lookup against carrier data, and Free makes no lookups. That’s also why the warn card on Free never suggests a corrected address — there is none to suggest — and why Free can cost nothing: there is no per-order work to charge for.
What Pro adds
Everything in Free, plus the verification layer:
- Every shipping address verified deliverable against carrier and postal data, down to the delivery point.
- The corrected address ready to apply: the buyer prompt carries the verified fix, one tap to accept. Here’s what buyers see.
- Missing apartment and unit numbers caught — the most expensive typo there is.
- Pure formatting differences applied automatically, in the carrier-verified format.
Pro is $0.04 per order with no base fee. A 500-order month costs $20. A slow month costs almost nothing, which is the point of usage pricing. What counts as a charged order spells out the edge cases.
How to decide
Most stores lose more money to undeliverable addresses than to policy violations. An address that looks right but isn’t — a wrong ZIP, a missing apartment number, a unit that was never there — gets the parcel returned, and carriers charge $25+ to correct an address mid-route. If failed deliveries are the problem you installed an app for, you want Pro.
Free fits when your problem is narrow and known: you ship UPS-only and need PO Boxes stopped, or you need a hard country blocklist, and you’d rather pay nothing than per order.
You can switch between plans any time, and your first 100 orders verify free regardless, so the cheapest way to decide is to let the trial show you what it catches.