King Checkout Validation vs Kpostcode Korea Address Lookup
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026.
The short answer
- King Checkout Validation and Kpostcode Korea Address Lookup are detected on the same number of Shopify stores (1) as of Nov 9, 2026.
- On the Shopify App Store: King Checkout Validation 5.0 from 20 reviews and Kpostcode Korea Address Lookup 3.0 from 1 reviews.
- Only King Checkout Validation lists a free plan. Paid plans start at $4.99/month for King Checkout Validation and $10/month for Kpostcode Korea Address Lookup.
- King Checkout Validation lists 13 features Kpostcode Korea Address Lookup’s listing doesn’t mention, including Cart-based, Checkout alerts, Collection-specific.
Head to head
- Australia
- South Korea
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · Create and test validation rules
- · Free for development stores
Basic
- · Block PO box addresses
- · Live chat and email support
- · Require VAT numbers
- · Require house, apartment or suite number
Premium
- · All Basic features
- · Build regular expression rules
- · Combine cart and customer conditions
- · Detect non-Latin characters
- · Match keywords in checkout fields
- · Set checkout field length limits
Standard
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureUse checkout validation to check shipping and billing address fields before orders are placed. Block PO boxes, require house or apartment numbers, and check postcode/ZIP, email and VAT/tax ID formats. Match phone country codes to address countries. Set order limits by cart amount, quantity or weight, with conditions for products, customer tags and countries. Use keyword, regex and field-length checks.
Shopify에서 Checkout Extension UI 사용을 제한하고 있어, 이 앱은 아쉽게도 “Shopify PLUS 고객만”이용할 수 있습니다. Leveraging the Korean government’s address lookup API, this tool simplifies checkout for South Korea. It enables accurate address and postcode lookup, reducing cart abandonment and improving customer satisfaction. Essential for the Korean market, it ensures fast, reliable address entry.
- Verifies presence of house/apartment number in addresses
- Validates completion of customer's VAT number (Tax exemption)
- Filters out Post Office (PO) Box addresses
- Field Length Validation, Custom Keyword and Regular Expression Validation
- Korean address and postcode lookup for accurate checkout process
- Integration with the official Korean government’s address database API
- Fully compatible with Checkout Extensibility
- Customisable widget to match your brand
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 |  King Checkout Validation |  Kpostcode Korea Address Lookup |
|---|---|---|
| Detected stores | 1 | 1 |
| 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 | Home & Garden | Furniture |
| Top store countries | Australia | South Korea |
Reviews
| Measure | King Checkout Validation | Kpostcode Korea Address Lookup |
|---|---|---|
| App Store rating | 5.0 ★(ahead) | 3.0 ★ |
| App Store reviews | 20(ahead) | 1 |
| New reviews, 28 days | 0 | 0(ahead) |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | King Checkout Validation | Kpostcode Korea Address Lookup |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $4.99/month(ahead) | $10/month |
| Longest free trial | 7 days | 14 days |
| Plans listed | 3 | 1 |
Listing
| Measure | King Checkout Validation | Kpostcode Korea Address Lookup |
|---|---|---|
| Shopify category rank | #24 | #29 |
| Shopify App Charts | Not on this week’s charts | #1 in Internationalization - Other |
| Built for Shopify | Yes | No |
| Launched | Mar 15, 2024 | Aug 13, 2024 |
| Languages | 1 | 1 |
| Developer | Lightcone | Seoul Commerce |
FAQ
King Checkout Validation and Kpostcode Korea Address Lookup: common questions
- Which is more popular, King Checkout Validation or Kpostcode Korea Address Lookup?
- King Checkout Validation and Kpostcode Korea Address Lookup are detected on the same number of Shopify stores (1) as of Nov 9, 2026.
- Is King Checkout Validation or Kpostcode Korea Address Lookup cheaper?
- Only King Checkout Validation lists a free plan. Paid plans start at $4.99/month for King Checkout Validation and $10/month for Kpostcode Korea Address Lookup. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, King Checkout Validation or Kpostcode Korea Address Lookup?
- On the Shopify App Store: King Checkout Validation 5.0 from 20 reviews and Kpostcode Korea Address Lookup 3.0 from 1 reviews.
- What features does each app list that the other doesn’t?
- King Checkout Validation lists 13 the others don’t mention, such as Cart-based, Checkout alerts, Collection-specific, Custom messages. 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 Nov 9, 2026; 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 Nov 9, 2026. 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.