Six free keyword research tools and how to combine them

Executive overview

Free keyword research tools lack search metrics, depth, and intent signals. Used together, they cover the basics and cost nothing.

The tools are most useful when layered: use one to generate ideas, another to validate volume, and a third to check trend direction. Free tools break down when you need to understand click rates, SERP volatility, or ranking difficulty.

Free tools are a starting point, not a complete research stack.

The six tools

1. Google Correlate — finds queries with similar search patterns to a seed term; surfaces subtopics and unexpected related terms. No metrics; results are often noisy.
2. Keyword Shitter — mines Google autocomplete at scale; generates thousands of long-tail keywords. No metrics; slow to produce actionable results.
3. Keywords Everywhere — Chrome extension that overlays search volume and CPC data on Google, YouTube, Amazon, and other sites. Sources data from Google Keyword Planner, which buckets keywords into rounded averages — so volumes for close variants (singular vs. plural) can look identical when they are not.
4. Search engine autocomplete — non-Google engines (Amazon, Etsy, Pinterest, YouTube) surface intent-specific keyword ideas. Particularly useful for niche markets where Google's autocomplete conflates multiple meanings.
5. Google Trends — shows relative popularity over time. Good for spotting seasonal patterns and declining niches. Provides no absolute search volume.
6. Answer the Public — generates questions, prepositions, and comparisons from a seed keyword. With Keywords Everywhere installed, shows rough volume. Limited to ~170 results per query.

Sample workflow: homemade cards niche

• Search the seed keyword in Google with Keywords Everywhere active; check the "people also searched for" panel for higher-volume variants.
• Confirm the dominant search intent from the top 10 results (e.g. ideas lists vs. tutorials vs. product pages).
• Run the keyword in Google Trends over 5 years to catch seasonality or decline.
• Run the keyword in Answer the Public to find sub-angles (e.g. "for boyfriend", "for teachers", "for birthday") that could become sections in a single post.

What free tools cannot tell you

• Whether Google's intent signal for a keyword is stable or volatile (SERP churn).
• Actual click-through rates split between paid and organic results.
• Whether competing pages can realistically be outranked.
• Accurate per-variant search volumes (due to Keyword Planner bucketing).

When to move to a paid tool

• When you need to know what it will take to rank, not just whether a keyword exists.
• When volume decisions hinge on close keyword variants.
• When you need to filter thousands of keyword ideas by difficulty and clicks simultaneously.
• As a site grows, the cost of targeting the wrong keywords outweighs the cost of a subscription.