Start a project

Free tools

Tools we built for ourselves, open to everyone

Seven small, fast utilities for web developers and marketers: see every tag a page loads, confirm a GTM container is live, validate structured data, identify a site's platform, preview a Google snippet, geolocate an IP and check a layout against the golden ratio.

  1. 01

    Tag Explorer

    See every tag a page loads

    Scan any URL and get a plain-English list of its GTM containers, analytics, pixels and conversion tags, each linked to its guide.

    Open the tool
  2. 02

    GTM Checker

    Find the containers on a site

    Confirms which Google Tag Manager containers a page actually loads, so you know the right one is live before you touch it.

    Open the tool
  3. 03

    Schema Tester

    Read a page's structured data

    Pulls the JSON-LD and microdata off any page and shows what Google will see, with the errors a rich result would trip on.

    Open the tool
  4. 04

    What CMS Is This

    Identify the platform behind a site

    Tells you whether a site runs WordPress, Shopify, Wix, Squarespace, Webflow or something else, and the clues it used to decide.

    Open the tool
  5. 05

    SERP Preview

    Preview a Google result before you publish

    Type a title and description and watch the Google snippet update live, with pixel-width limits for desktop and mobile.

    Open the tool
  6. 06

    IP Lookup

    Geolocate any IP address

    Shows the country, city, network and hosting provider behind an IP, and plots it on a map. Handy for form spam forensics.

    Open the tool
  7. 07

    Golden Ratio Calculator

    Check an image against phi

    Drop in an image or two numbers and see how close the proportions sit to 1.618, with a live overlay for designers.

    Open the tool

Questions about the tools

Are these tools really free?

Yes. No signup, no ads, no credit card. We built them for our own audits and client work and keep them open because they are useful. A soft rate limit stops scripts hammering them.

Do you store the URLs I check?

Results are cached briefly so repeat checks are fast (three minutes for Tag Explorer, an hour for the CMS detector) and then dropped. We do not build a history of what you look up.

Can I use them from a script or an AI agent?

Tag Explorer has a documented JSON and plain-text endpoint at /api/tools/tag-explorer. The other fetch-based tools answer JSON at /api/tools/<tool>?url=. Keep to the 40 requests per 10 minutes limit or ask us for a key.

Why did a tool say a site blocked it?

Our scanner fetches from a server, and some sites answer servers with a bot challenge instead of their page. The tools report the HTTP status they saw rather than guessing. Check the site in your own browser for the rest.