Amazon Keyword Research
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.
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.
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 …
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 …