Selling online — pricing, fee, email and consumer-law rules
Total-price rules, junk-fee bans, unit prices, auto-renewal signups, bulk-sender email rules, duties and marketplace margins. Each check works on your own price, page or message.
19 tools
GPSR Listing Lint
VS Code extension
Audits a product feed row by row against Article 19 of the EU General Product Safety Regulation
Junk-Fee Total Price Check 2026
Browser extension · Chrome, Edge, Firefox
Rebuild a US hotel or live-event offer the way 16 CFR 464 requires: Total Price up front, excluded charges itemized, penalty ceiling shown.
EU Parcel Duty Calculator 2026 — €3 Rule
Browser extension · Chrome, Edge, Firefox
€3 per 4-digit tariff heading, not €3 per parcel — the duty that replaced the €150 relief on 1 July 2026
Immobilienanzeige GEG 87 Lint
VS Code extension
13 rules over German property-ad HTML: the five mandatory Section 87 GModG fields, the ten-year certificate limit, and the Anlage 10 class band that has to match the kWh…
Swiss Parcel VAT Threshold Check 2026
Browser extension · Chrome, Edge, Firefox
The small-consignment ceiling is CHF 5 divided by the rate - not the CHF 65 figure the tables still print
Hospital Price Transparency MRF Lint
VS Code extension
15 offline rules read your standard charges JSON the way 45 CFR Part 180 and the CMS template do - the dirty sample returns 17 findings, 15 errors
GPSR EU Listing Risk Calculator 2026
Browser extension · Chrome, Edge, Firefox
What your EU marketplace listings lose when a GPSR takedown lands - and what an EU Responsible Person costs instead
US Landed Cost Checker 2026 (de minimis suspended)
Browser extension · Chrome, Edge, Firefox
Duty, MPF and true landed cost on every US-bound order now that the $800 free pass is gone
German Price Display Check (PAngV): Grundpreis and the 30-Day Low
Browser extension · Chrome, Edge, Firefox
One product line in, the base price and the largest legal discount out - before a German trade association reads the page.
Auto-Renewal Signup Lint (California ARL)
VS Code extension
Sixteen statutory checks on the signup page AB 2863 rewrote, in your editor and in the browser
Email Footer Law Lint
VS Code extension
Fourteen checks on an HTML email footer: CAN-SPAM postal address and 10-business-day opt-out, CASL's 60-day window, and German 5 DDG, the statute that replaced 5 TMG on…
Bulk Sender Lint - the Gmail, Yahoo and Outlook.com rules, checked in your mailer code
VS Code extension
21 dated checks over SPF, DKIM, DMARC, RFC 8058 one-click unsubscribe and TLS, in VS Code and in the browser
Currency Minor Unit Lint
VS Code extension
Finds the money lines that send the wrong amount to a payment API: the x100 that charges 100x in JPY, the toFixed(2) that truncates KWD, and the currency codes that…
Outlook Email HTML Lint - Classic vs New
VS Code extension
Classic Outlook renders with the Word engine, the new Outlook with WebView2. Lint one email file against both at once, line by line, before you send.
Fashion Boutique Shopify Theme — 4 Storefront Setups (Boutique, Wholesale, Furniture, Apparel), 10 Sections
Shopify theme
You get 10 sections with 53 theme-editor settings you change from Online Store ▸ Themes, without opening a .liquid file.
Beauty Salon Theme for Shopify — 3 Storefront Setups (Salon, Fashion Store, Jewelry Store), 10 Sections
Shopify theme
You get 10 sections with 54 theme-editor settings you change from Online Store ▸ Themes, without opening a .liquid file.
Furniture Shopify Theme — Made-to-Order Lead Times, Freight Delivery & Room Collections
Shopify theme
A Shopify theme built for furniture shops that sell made-to-order pieces and ship by two-person freight: 10 sections and 67 settings you edit in the theme editor,…
Shopify Restaurant Theme — Weekly Menu, Kitchen Hours & Allergen Key (US 9 / EU 14)
Shopify theme
You edit all 63 settings yourself — kitchen hours, last order, allergen key, this week's dishes.
FBA Profit & Break-Even Calculator for Amazon Private-Label Sourcing — Chrome Extension + Web Tool
Browser extension · Chrome, Edge, Firefox
Amazon's referral fee is 15% in most categories with a $0.30 per-item minimum (Amazon Seller Central published US fee schedule): quote a supplier without it and every…
Questions
Do my files leave my computer?
No. The extensions and command-line checks run on your machine and your files are not uploaded. The browser calculators run in the page.
What does it cost?
Every tool is free for the file or case in front of you. The paid part is a one-time licence key; each tool page shows its price and what the key adds. A team key ($149 once) opens every ReadyStack linter for five seats and CI.
More collections
US payroll, tax and filing deadlines — 2026 checksUK tax, payroll and HMRC rules — 2026/27 checksEU rules with a 2026 date — deadline and fine checksE-invoicing rules — format and deadline checksPrivacy and data protection — rule checksAccessibility — WCAG and EAA checksSecurity and supply chain — linters for the rules that bind softwareDeveloper deadlines — deprecations, removed APIs and build breaksAI rules and agent configuration — lintersSubmission gates — pass the store or registry review the first timeHealth and medical software — regulatory checksTemplates and design assetsDeutschland 2026 – Fristen, Lohn, Steuer und Pflichten2026年の申告・インボイス・社会保険 チェッカーとテンプレート All tools