LSI keyword generator: the related terms and entities a thorough page covers.

Enter a keyword. The tool lists related terms, subtopics and entities that belong in a complete treatment of the topic. Use the list to check your page for gaps, not as words to insert.

By · Updated September 25, 2026

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Related terms generator

Runs on our server. Your text is sent to Anthropic's Claude to write the result. We count runs and never save what you enter; an identical request may be answered from memory for up to five minutes.

What you can do with it

  • Check a draft for subtopics a complete answer would include
  • Find the entities, such as tools, standards or people, a topic usually mentions
  • Plan headings for a new page so it covers the topic fully
  • Compare your page's vocabulary with the language of the subject

How it works, step by step

  1. 1

    Start with the question the page answers

    Write one sentence saying what the searcher wants to know. Related terms only help if you know which ones serve that question and which belong on a different page.

  2. 2

    List the related terms and entities

    Use the tool, your own knowledge and the headings of the current top results to list what a complete answer mentions: subtopics, steps, tools, standards, common problems.

  3. 3

    Check your draft against the list

    Mark each term your page already covers. For each one it does not, decide whether the reader needs it. If they do, add a sentence or a section that explains it, not just the word.

  4. 4

    Leave out what does not belong

    Some related terms are separate topics with their own search intent. Link to a page about them, or leave them for another article, rather than widening this one.

  5. 5

    Read it back as a reader

    The finished page should read naturally with no term forced in. If a sentence exists only to contain a keyword, cut it.

“LSI keywords” is a misnomer

Latent semantic indexing is an information-retrieval technique developed in the 1980s to find documents that share meaning even when they do not share exact words. At some point SEO advice borrowed the name and turned it into “LSI keywords”, a list of words you supposedly need to sprinkle into a page to rank.

There is no evidence Google uses LSI, and Google’s John Mueller has said there is no such thing as LSI keywords. Modern search systems understand language in far more sophisticated ways than a decades-old indexing method.

We kept the name in the title because it is what people search for. What the tool actually does is list related terms and entities.

What is real: topical coverage

Behind the misnomer is a useful idea. A thorough page on a topic naturally mentions the concepts that go with it. An article on sourdough starters that never mentions flour, hydration, feeding or temperature is probably incomplete, and a reader will notice before any search engine does.

So related terms are a coverage check. They help you spot what a complete answer usually includes and your draft skipped. They are not a list to stuff in. Adding a word without explaining the idea behind it makes the page worse, not better.

How to do it by hand

You can build a good related-terms list without any tool:

  • Read the top results. Look at their headings. The subtopics several of them share are probably ones readers expect.
  • Check People also ask and related searches at the bottom of Google’s results page.
  • Name the entities. List the tools, standards, organizations and people the topic involves.
  • Ask someone who does the work. Practitioners mention the steps and problems that outsiders miss.

Then compare your draft against the list, one term at a time, and ask whether the reader needs it.

Use it with density and demand checks

After you add missing subtopics, run the page through the keyword density analyzer to make sure no single phrase is repeated to the point of sounding forced. And because related is not the same as searched, check the terms you are considering as separate pages with keyword research before you write them.

AltoRank plans content from a site’s own data and drafts each piece against a brief that covers the topic, and a person approves every piece before it publishes.

Frequently asked questions

What are LSI keywords?

The name comes from latent semantic indexing, an information-retrieval technique from the 1980s. It was never shown to be part of how Google ranks pages, and Google's John Mueller has said there is no such thing as LSI keywords. In practice people use the phrase to mean related terms, and that is what this tool gives you.

So is this tool useless?

No. The idea behind the phrase is sound: a thorough page on a topic mentions the concepts, entities and subtopics that go with it, because a complete answer needs them. The tool lists those so you can check your coverage. What does not work is inserting the words to please an algorithm.

How many related terms should I use?

There is no target. Use the ones your reader needs to understand the topic, and explain them properly. A count of related terms on a page is not a ranking factor you can optimize.

Where do the terms come from?

From a language model reasoning about the topic, not from a search database. That makes them good for coverage and weak on demand: a term being related does not mean anyone searches it. For search volumes, use the keyword research tool.

What happens to the keyword I enter?

It goes to our server and on to Anthropic's Claude, a fast model, which lists the related terms. We count how many times the tool runs and never save what you enter; an identical request may be answered from memory for up to five minutes. There is a daily usage limit so the tool can stay free without a signup.

More free tools

Free Keyword Density Checker: A Diagnostic, Not a Target See which words and phrases a page repeats, with counts. Plus why an ideal density figure does not exist. Free Keyword Research Tool: Volume, Difficulty, CPC Enter a seed keyword and a country to get estimated search volume, keyword difficulty, cost per click and related keyword ideas. Free, no signup. Free SEO Content Brief Template and Generator Fill in eleven fields and copy a Markdown content brief a writer will follow. Free, in your browser, with the reasoning behind each field. Free Keyword Clustering Tool: Group Keywords by Topic Paste a keyword list and get topic groups with a page type for each. Free, in your browser, plus the method for confirming groups against the SERP.
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