Amazon keyword research does not require a $39/month subscription to get started. Here are five free tools that cover the whole workflow, from brainstorming to verifying your listing actually uses what you found.
Amazon's own search bar is the most underrated free tool. Autocomplete suggestions are pulled from real Amazon search data, so anything it suggests is a confirmed query, not a guess.
Sonar by Sellics does uncapped reverse ASIN lookups for free. Paste in a competitor's ASIN and it returns every keyword that product is indexed for, with volume estimates. No daily limit on the core function, which is rare for a free tool.
Helium 10's free tier gives limited access to Cerebro (reverse ASIN) and Magnet (keyword discovery). Capped at 20 results per search, but enough to build an initial keyword map.
Google Keyword Planner is not Amazon-specific, but demand patterns on Google and Amazon often overlap, and it is useful for validating whether a term has real search volume before you build a listing around it.
Amazon Listing Audit is not a keyword discovery tool, it is the verification step: it checks whether the keywords you researched actually made it into your title, bullets, and backend fields. A full comparison of ten free tools including a feature matrix is at amazonlistingaudit.com/blog/amazon-keyword-research-free-tools.
The workflow: brainstorm with autocomplete, expand with Sonar or Helium 10's free tier, validate demand with Keyword Planner, then verify the listing with an audit tool. That covers what most paid platforms do, just across more tabs.
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