Amazon Keyword Research
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Amazon Seller Tools
Helium 10 CPR Explained: What the Cerebro Product Rank Number Assumes
What Helium 10 CPR actually estimates, the assumptions baked into the Cerebro Product Rank number, and the conditions where it stops being useful.
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Amazon Seller Tools
Helium 10 Free Plan (2026): Exactly What the Free Tier Lets You Do
The Helium 10 free plan still exists on 2026-08-19. Here are the per-tool limits, where Cerebro stops, and which jobs the free tier cannot finish.
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Amazon Seller Tools
Sonar Keyword Tool Review (2026): It's Retired — What to Use Instead
Sonar, the free Amazon keyword tool from Perpetua, is retired: its page now says the feature is gone. Evidence checked 2026-08-06, plus working …
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Amazon Seller Tools
MerchantWords Alternatives (2026): 6 Keyword Tools Ranked by Why Sellers Leave
The best MerchantWords alternative depends on why you're leaving: the $149 global tier, no free trial, or volume with no sales data. 6 tools priced …
Amazon Seller Tools
MerchantWords Review (2026): Is This Amazon Keyword Tool Worth It?
MerchantWords review for 2026: real pricing from $35/mo, what the keyword tool does well, the seller complaints that matter, and whether it beats …