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Why Cruxfinder
Built for AI-native ecommerce operators.
AI Tooling
New AI tools for sellers, tested and ranked weekly. Skip the demos, ship the workflow.
Agent Workflows
Copy-paste agent and prompt stacks running inside 8 and 9-figure ecommerce brands.
Model Benchmarks
GPT, Claude, Gemini, and open models scored on listing copy, ads, ops, and support.
Ecommerce Signal
What's moving on Amazon, Shopify, TikTok Shop, and Walmart, distilled in one read.
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Deals you cannot get elsewhere
Negotiated only for CruxFinder readers, off the public pricing page.
Only tools sellers actually use
PPC, repricing, accounting, freight, AI listings, and review management.
AI Snapshot
What's moving this week in AI for ecommerce.
AI-Driven Category Lifts
- AI Shopping Assistants+62%
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- AI Listing Generators+41%
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- AI Creative Suites+33%
Fastest-Growing AI Search Terms
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About Cruxfinder
Amazon seller news and ecommerce AI tools, in one Monday email.
100k
subscribers
Monday
every week
5 min
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Free
always
Cruxfinder is a free intelligence brief for people who sell online for a living. Each Monday we read the marketplace announcements, seller forums, ad platform release notes, and earnings calls, then publish the handful of items that change how you price, launch, advertise, or forecast this week. No recycled press releases, no filler. Every issue includes prompts, agents, and workflows you can copy into your own operation the same day, along with the numbers behind them.
What we cover
Amazon FBASeller CentralShopifyWalmart MarketplaceTikTok ShopRetail media and PPCAI tooling
Beyond the newsletter
Blog
Daily analysis on the stories that move seller margins.
Newsletter archive
Every past issue, searchable by topic and edition.
Software directory
Vetted ecommerce and AI tools with honest comparisons.
Free seller tools
FBA fees, PPC break-even, keyword density, listing quality, review sentiment, TikTok Shop validation.
Around 100k subscribers read Cruxfinder: brand owners, agency operators, PPC and listing specialists, aggregators, and the software teams building for them. They also get Crux Pass, a free bundle of negotiated deals and extended trials on the software sellers already pay for. Reading Cruxfinder costs nothing and takes about five minutes a week.
FAQ
Frequently asked questions
What is Cruxfinder?
Cruxfinder is a free newsletter and intelligence site for ecommerce sellers. Every Monday we send the week's most important Amazon, Shopify, TikTok Shop, and Walmart news, plus the AI tools, prompts, and workflows sellers are actually using to run their businesses.
How much does the Cruxfinder newsletter cost?
Nothing. The newsletter is free, and so is every back issue in the newsletter archive, the blog, the software directory, and all of the free seller tools.
Who reads Cruxfinder?
Around 100k subscribers: Amazon and multichannel brand owners, agency operators, PPC and listing specialists, aggregators, and software teams selling into the ecommerce market.
What free tools does Cruxfinder offer?
Six browser-based calculators and analysers with no sign-up: an Amazon FBA fee calculator, a PPC break-even calculator, a keyword density checker, a listing score grader, a review sentiment analyser, and a TikTok Shop product validator.
What is Crux Pass?
Crux Pass is a free perk for subscribers. It bundles negotiated deals, extended trials, and credits on the PPC, repricing, accounting, freight, AI listing, and review tools that sellers already pay for.
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