The best Amazon keyword research tool overall is Helium 10 (Cerebro reverse-ASIN + Magnet) for depth, or Jungle Scout’s Keyword Scout for beginners. For best value, SellerSprite; for keyword search-volume and CPC trends over 12 months on a free plan, Ecominsights; and Amazon’s own Brand Analytics is the best free first-party source if you have Brand Registry. Below, all eight are ranked with prices and honest pros and cons.

The 8 best Amazon keyword research tools

1. Helium 10 (Cerebro & Magnet) ; best overall

Cerebro (reverse-ASIN) and Magnet are the deepest Amazon keyword tools available, tied into Helium 10’s listing and PPC suite.

• Best for: sellers who want maximum keyword depth and to act on it.
• Pricing: $129/mo ($99 annually); limited free plan.
• Pros: unmatched depth; reverse-ASIN quality. Cons: priciest; more than a beginner needs.

2. Jungle Scout (Keyword Scout) ; best for beginners

Keyword Scout offers reverse-ASIN and search-volume data in a beginner-friendly workflow.

• Best for: new sellers building their first listings.
• Pricing: $49/mo ($29 annually); no free trial.
• Pros: easy; integrated with product research. Cons: less deep than Cerebro.

3. SellerSprite ; best value reverse-ASIN

SellerSprite delivers reverse-ASIN keyword research at a lower price, with a free tier.

• Best for: budget-conscious keyword research.
• Pricing: free plan; Standard from $79/mo.
• Pros: value; free tier. Cons: UI/brand less polished.

4. SellerApp ; best for keyword + PPC

SellerApp combines keyword research with PPC/advertising tools.

• Best for: sellers optimizing listings and ads together.
• Pricing: free Freemium; paid from ~$39/mo.
• Pros: PPC integration; free tier. Cons: smaller database than the leaders.

5. Ecominsights ; best for keyword trend history (free)

Ecominsights shows how an Amazon keyword’s search volume and CPC have trended over the past 12 months ; across 5M keywords, on a free ($0/mo) plan. (Disclosure: Ecominsights is our tool; ranked by its genuine strength ; historical trends, not listing-time harvesting.)

• Best for: spotting rising or declining keyword demand over time.
• Pricing: Free $0/mo; Basic $39/mo; Pro $119/mo.
• Pros: 12-month search-volume + CPC trends, free. Cons: not a listing/reverse-ASIN harvesting tool; launched 2026 (12 months of history, not years).

6. Amazon Brand Analytics ; best free first-party data

Amazon’s own Brand Analytics (Search Query Performance, Search Frequency Rank) is the only source of actual Amazon search data ; free, but requires Brand Registry.

• Best for: brand-registered sellers wanting first-party search data.
• Pricing: free with Brand Registry.
• Pros: real Amazon data, free. Cons: requires a registered brand; less workflow tooling than third-party suites.

7. Data Dive ; best for advanced sellers & agencies

Data Dive is a power-user keyword and listing-optimization tool popular with agencies. 

• Best for: advanced keyword clustering and listing optimization.
• Pros: deep analysis. Cons: steeper learning curve; pricing not verified here.

8. MerchantWords ; best search-volume database

MerchantWords maintains a large Amazon search-term database across marketplaces. 

• Best for: broad keyword discovery and international volume.
• Pros: large database. Cons: volume accuracy debated; pricing not verified here.

How to choose

• Deepest reverse-ASIN research? → Helium 10 (Cerebro).
• Beginner-friendly? → Jungle Scout (Keyword Scout).
• Best value / free tier? → SellerSprite or SellerApp.
• Keyword demand trends over time? → Ecominsights (free).
• Actual Amazon search data? → Amazon Brand Analytics (if brand-registered).

FAQ

What is the best free Amazon keyword tool? Amazon Brand Analytics is the best free source of real Amazon search data (needs Brand Registry). Among third-party tools, Ecominsights (keyword trends, free plan), SellerApp (Freemium), and SellerSprite (free tier) are the strongest free options.