Sonar and KeywordTool.io surface search terms at no cost; they stop at suggestions.
Paid research suites
Helium 10 (Cerebro/Magnet) and Jungle Scout (Keyword Scout) add search volume and competitiveness data.
From keywords to listing
Keywords only help once placed in a compliant title/bullets/backend. ListingGood writes and compliance-checks that placement.
Backend search terms
The backend 'search terms' field still matters; stuffing it with repeats triggers warnings — keep it clean and compliant.
Free check: Paste your ASIN or listing text for a free preliminary compliance check — we flag risky claims and category issues in seconds, no login required.