King Checkout Validation vs Lynk

Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for King Checkout Validation, Oct 14, 2026 for Lynk.

The short answer

  • Only King Checkout Validation lists a free plan.
  • King Checkout Validation lists 13 features Lynk’s listing doesn’t mention, including Cart-based, Checkout alerts, Collection-specific.

Head to head

Detected stores

King Checkout Validation: 1
Lynk: —

App Store reviews

King Checkout Validation: 20
Lynk: —
Open this comparison in ShoplistFree account. Every feature, store and change, side by side.
Pitch
—
—
Categories
  • Order limits
  • Checkout - Other
  • Orders - Other
Languages
  • English
  • English
  • Greek
Launched
Mar 15, 2024
May 28, 2026
Built for Shopify
Built for Shopify
Not badged
Reviews per month
1 last full month
—
Detected stores
1active installs
  • Tilemall
0active installs
Most common store size
5,001-10,000 products100%
—
Top countries
  • Australia100%
—

Momentum

New reviews each month

Review pace is the clearest public read on how fast an app is winning new merchants.

035MarJunSepJanMayJulAugKing Checkout Validation: 1 reviews in March 2025King Checkout Validation: 1 reviews in May 2025King Checkout Validation: 1 reviews in June 2025King Checkout Validation: 1 reviews in July 2025King Checkout Validation: 1 reviews in September 2025King Checkout Validation: 2 reviews in November 2025King Checkout Validation: 1 reviews in January 2026King Checkout Validation: 1 reviews in April 2026King Checkout Validation: 3 reviews in May 2026King Checkout Validation: 3 reviews in June 2026King Checkout Validation: 1 reviews in July 2026King Checkout Validation: 1 reviews in August 2026
King Checkout ValidationLynkCompleted months only
Free options
Free planFree trial
Free planFree trial
Monthly range
From $0 to $9.99/month
—
Plans
FreeFree
  • · Create and test validation rules
  • · Free for development stores
Basic$4.99/month
7-day free trial
  • · Block PO box addresses
  • · Live chat and email support
  • · Require VAT numbers
  • · Require house, apartment or suite number
Premium$9.99/month
7-day free trial
  • · 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
Annual$29.90/year
7-day free trial
Coverage
13 of 13 features100%
0 of 13 features0%
Unique strengths
  • Cart-based
  • Checkout alerts
  • Collection-specific
  • Custom messages
  • +9 more
—
Order limits
100%13/13
0%0/13
Limit rules
100%10/10
0%0/10
Notification settings
100%3/3
0%0/3
1300onlybothonly
King Checkout ValidationLynk13 features listed across both App Store listings

Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.

See every feature
Works with also listed by another
  • Checkout
—
How it sells itself

Use 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.

Greek stores often need a customer's VAT number and company name to issue an invoice. The standard checkout does not collect these details, and custom checkout fields are only available on the Plus tier. Lynk adds an optional VAT section to your cart, available to every store. Customers who need an invoice enter their Greek or EU VAT number and company name.

Key points
  • 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
  • Add optional VAT and company-name fields to the cart
  • Validate Greek VAT numbers with the AADE tax authority
  • Validate EU VAT numbers with the VIES verification service
  • Save the official company name and details on each order
Screenshots
Customized Combination Validation Rules
Customize validation rules through keywords and regular expressMissing House Number / Apartment / VAT number CheckerMaximum Field Length Checker
lynk app home page on admin
cart page eu vat capturecart page showing greek vat details captureorder page eu vat details

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.

Showing only the rows where the apps differ.

Adoption

MeasureKing Checkout ValidationLynk
Detected stores1as of Nov 9, 2026Not published
Net store change, 28 days0estimated0estimated
Stores added, 28 daysNot enough dataNot enough data
Big-brand shareNot enough dataNot enough data
Top store categoriesHome & GardenNot published
Top store countriesAustraliaNot published

Reviews

MeasureKing Checkout ValidationLynk
App Store rating5.0 ★Not published
App Store reviews20Not published
New reviews, 28 days0Not enough data
Reviewers a year or more inNot enough dataNot enough data

Pricing

MeasureKing Checkout ValidationLynk
Free planYesNot listed
Lowest paid monthly plan$4.99/monthNo monthly plan listed
Longest free trial7 days7 days
Plans listed31

Listing

MeasureKing Checkout ValidationLynk
Shopify category rank#24in Checkout - Other#334in Orders - Other
Shopify App ChartsNot on this week’s chartsNot on this week’s charts
Built for ShopifyYesNo
LaunchedMar 15, 2024May 28, 2026
Languages1English2English, Greek
DeveloperLightconeLynk.gr

FAQ

King Checkout Validation and Lynk: common questions

Is King Checkout Validation or Lynk cheaper?
Only King Checkout Validation lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
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 for King Checkout Validation, Oct 14, 2026 for Lynk; 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 for King Checkout Validation, Oct 14, 2026 for Lynk. 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.