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Free tools · Open data

Free tools and open data for online stores.

Calculators, checkers and datasets we built for Shopify and WooCommerce merchants, agencies and the people who write about them. No sign-up, nothing to install, and the data is free to cite.

  • 5open datasets
  • 14free tools
  • 0sign-ups

Open data

Datasets with the method and every source published. Use them in articles, tools and research under CC BY 4.0, with a link back.

Shopify apps 716,063 stores, by app The most popular Shopify apps The apps on the home page of every Shopify store in a monthly crawl: reviews, email, chat, pay later and cookie banners by share, apps per store by size and country, and the real-user speed cost of each extra app. CSVSQL38 app pages Shopify themes 716,063 stores, by theme The most popular Shopify themes Every Shopify store in a monthly crawl of the web, counted by theme: market share, free against paid, how old the Dawn installs are, Horizon's climb, and how fast each theme is for real visitors. CSVSQLUpdated quarterly Store platforms 24,093 store moves in a year E-commerce platform migrations Where online stores go when they change platform, counted from monthly web crawls: every route, gains and losses by platform, and how often each one loses its stores. CSVSQLUpdated quarterly Shopify pricing 26 changes since 2019 Shopify pricing history Every change to Shopify's US plan prices, card rates, transaction fees and Plus pricing, each dated from Shopify's own archived pages. CSVJSONRSSChecked weekly WooCommerce plugins 88 plugins mapped WooCommerce plugin map What each popular WooCommerce plugin becomes on Shopify: a built-in feature, an app, Plus only or nothing, with the migration risk of each. CSVJSONOpenAPInpm

Look up a theme's adoption and real-user speed

Start with Dawn, Horizon, Prestige, Impulse or Debut. Each report shows versions in use, store sizes, countries and real-user speed from the September 2026 crawl and August 2026 Chrome UX Report. These are measurements of whole stores, including their apps and content.

Tools

Each one runs in your browser or reads only public pages. Nothing asks for a login, an API key or an email address.

Shopify costs Shopify fees calculator What each Shopify plan costs a month at your sales, with card rates, third-party fees, POS Pro and apps, and the sales level where the next plan pays for itself. US, UK, CA, AU Pricing Markdown calculator Your margin floor after card fees, shipping, returns and VAT, the deepest markdown that keeps it, and what every 5% step leaves per unit. In your browserVAT aware Dead stock Dead stock checker Drop your Shopify product and order exports: a dead stock score, the cash stuck at cost by days without a sale, and every variant ranked with a markdown that stays above cost. Nothing uploadedStore Diagnosis engine After Stocky Stocky alternative planner Tick what you used Stocky for: what the Shopify admin now does for free, and the cheapest app for the few jobs it does not, with prices checked in October 2026. 15 Stocky jobsPrices dated Black Friday Safe sale checklist Record the old prices, preview every change, schedule the end, put prices back and find leftover compare-at prices and discounts. Printable, ticks saved in your browser. 31 stepsShopify facts cited EU and UK sales 30-day lowest price checker Paste a price history and a sale price: the lowest price of the 30 days before the sale, the compare-at price you can show and the most you can say off. Paste or CSVSources cited Stock Holding cost calculator What slow stock costs to keep a day, a month and a year, and the day waiting costs more than a markdown gives up. In your browserSame maths as Clearance Any Shopify store Shopify store audit Type any store's address, yours or a competitor's, and see how much of its catalogue is sold out or permanently on sale, what is missing and what was left behind, scored against the most-visited Shopify stores. Public data onlyUp to 1,000 products Shopify themes Shopify theme detector Which theme any Shopify store runs, the Theme Store theme behind a renamed copy, how many releases behind it is and how fast it loads for real visitors. Any store Chrome extension Store Lens One click on any online store: the platform, the theme and its version, the services on the page, and how fast it really is for visitors. No account, nothing tracked. Any platform14 languages WooCommerce to Shopify Migration scanner Scan a WooCommerce store in about 20 seconds: catalog size, products over Shopify's option limit, plugin replacements, redirects and a price estimate. Public data only WooCommerce to Shopify Migration cost calculator The one-off and monthly costs of running the same store on WooCommerce and on Shopify, side by side. In the cost guide SEO Redirect CSV generator Turn your WooCommerce URLs into a file Shopify's redirect importer accepts, following the URL map for products, categories, tags, posts and pages. In the redirects guide Products Variant option calculator Check whether a WooCommerce product fits Shopify's 3 options and 2,048 variants, and see how to restructure it when it does not. In the variations guide

Writing about e-commerce?

Every number on these pages links to its source, and the datasets can be downloaded and quoted. If you need a cut we have not published, or spot something that looks wrong, write to hello@mufatech.com.