Your website is live. So why is nobody finding it?

Lighthouse is built into the Chrome browser on a computer. It scores one web page for speed, search engine basics and more, then explains how to fix each problem it finds. Its links are under Sources.

Licence: Apache 2.0. You may use it in a business without paying, under the licence's conditions.

The catch: a good score does not promise a high place in search results. Lighthouse itself says there are many other factors it does not score that may affect your search ranking.

It watches web pages you choose, such as a competitor's price page, and alerts you when they change. Its links are under Sources.

Licence: Apache 2.0. You may use it in a business without paying, under the licence's conditions.

The catch: if you run your own copy, it has no password until you set one, so set one before you use it. Keep it updated, because its security page lists past flaws, including a way round the login rated Critical and fixed in version 0.54.8. Its own disclaimer says you are responsible for following the terms of every site you watch and the law.

It is a collection of written instruction files that give an AI assistant a method for marketing jobs, such as writing ads. Its links are under Sources.

Licence: MIT. You may use it in a business without paying, as long as you keep its copyright and permission notice in any copies.

The catch: its instructions come from outside authors, so read its files before you add it. Its owner opened a request on 3 Nov 2026 to add an automatic check for hidden content in new files, and it was still open on 12 Nov 2026. It also holds optional helper programs that connect to your marketing accounts. Anthropic, maker of the AI assistant Claude, advises using instruction files only from yourself or Anthropic, and checking every file in any others.

Website: a set of web pages under one address that people open in a web browser, on a phone or a computer.

Web page and web address: one page of a website. Each page has its own address, also called a URL, such as the address of your contact page. Lighthouse checks one page at a time, by its address.

Search engine: a service such as Google Search that finds pages on the web and lists them when someone searches. Google says it uses programs called crawlers that explore the web to find pages.

Search results: the list of pages a search engine shows after someone types a search.

Ranking: the position of a page in the search results. The search engine decides the order. Google says that no one can guarantee a first-place ranking on Google.

SEO (search engine optimisation): work that helps search engines understand your pages, and helps people decide from the search results whether to visit your site. This is how Google's own starter guide describes it.

Open source: software whose code anyone may use and change, under its licence. All three tools in the video are open source.

Licence: the written terms that the makers of the code set for using, changing and sharing it. Read the licence before you change or share the code.

Apache licence (Apache 2.0): the licence used by Lighthouse and changedetection.io. It allows use in a business without a fee. If you share copies, you must include the licence, mark the files you changed and keep the original notices. The code comes "as is", with no promise that it works.

MIT licence: the licence used by Marketing Skills. It allows use in a business without a fee, as long as you keep its copyright and permission notice in any copies. It also comes "as is", with no promise that it works.

GitHub: a website where many open-source projects publish their code, licence and notes. The links for all three tools in this guide point to GitHub or to the makers' own pages.

Lighthouse: an open-source, automated tool that helps improve the quality of web pages. It checks speed, search engine basics and more, and its report explains how to fix each problem.

Chrome browser: Google's web browser. Lighthouse's own instructions start with Chrome for Desktop, which is why the video says "on a computer".

DevTools: short for developer tools, a set of tools built into the Chrome browser for looking inside a web page. Lighthouse sits in DevTools as its own tab.

Performance or speed score: Lighthouse's score for how quickly the page loads. A low score points to a slow page, and the report shows what to improve.

SEO score in Lighthouse: Lighthouse's check that a page follows the search engine advice it tests. Lighthouse says many other factors that it does not score may still affect your search ranking.

Competitor: another business that sells something similar to the same customers. In the video, this is your "neighbour".

Price page: the page on a website that lists prices. If a competitor changes theirs, you may want to know.

Change detection: watching a web page and sending you an alert when its content changes. changedetection.io can send alerts by email, Slack, Telegram, Discord and other routes.

Self-hosting: running your own copy of a tool on your own computer or server, instead of paying someone to run it for you.

Password and login: a password is a secret word, and a login is the screen that asks for it, so that only you can open the tool. A self-hosted copy of changedetection.io has no password until you set one.

Security update: a new version of software that fixes a known flaw. Projects list past flaws in public notices called security advisories.

AI assistant: a computer program you ask in plain words to write, answer or help with a task, such as Claude, made by Anthropic.

Instructions file or skills file: a file of written instructions, sometimes with helper programs, that an AI assistant loads for one kind of job. Marketing Skills is a collection of these files.

Outside authors and hidden content: outside authors are people who add work to a project they do not run. Hidden content is text in a file that a reader can easily miss, such as notes hidden from view.

Advert: a paid message that promotes your business, for example on Google, Facebook or Instagram. Marketing Skills has a file for writing advert headlines and text.