Seller Intelligence
Know what to sell by studying what buyers still complain about.
We turn real user frustrations into clear market signals. Each report maps the pain points buyers cannot stop complaining about — so you can build, source, or position a product that actually solves something.
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可折叠多用途手推车（户外/沙滩/带娃拖车）
宠物外出双肩背包(猫咪/小型犬)
滑雪巴拉克拉法帽 / 滑雪面罩
无线橱柜灯（充电式无线橱下灯）
狗狗拔河玩具
天然水晶原石
户外折叠椅
足球回弹训练网（Soccer Rebounder Net）
汽车遮阳板延伸挡片（偏光防眩 · 日夜两用）
狗狗电动磨甲器
可折叠硅胶手机支架（挂屏边/桌面款）
便携家用投影仪
硅胶婚戒
瑜伽垫
How this works
User research at scale
We collect thousands of real user voices from online communities — capturing frustrations, comparisons, and unmet needs in their own words.
Pain point mapping
Signals filtered for genuine dissatisfaction: recurring complaints, abandoned products, features buyers keep asking for.
Seller verdict
Insights translated into direct market entry guidance: what to build, what to avoid, what positioning wins.
Frequently Asked Questions
What is WhatToSell?
WhatToSell is a product research tool for e-commerce sellers. We synthesize real user pain points into actionable market entry guidance — opportunity scores, complaint breakdowns, and seller verdicts.
How is this different from product reviews?
Review sites write for buyers. We write for sellers. We don't tell you which product is best to buy — we identify where buyer frustration is highest and whether there's a real opportunity to enter that market.
How do you gather the insights?
We collect posts from topic-specific online communities where buyers describe real frustrations in detail — things they wish existed, products they've given up on, and complaints that repeat across thousands of conversations.
What does the Opportunity Score mean?
The Opportunity Score (1–10) reflects how strong the market gap is. It weighs complaint frequency, how actively buyers seek a better solution, and how feasible it is to build one. A score of 8+ means persistent, addressable demand.
Who is this for?
Amazon FBA sellers, Shopify store owners, product designers, and anyone sourcing goods who wants to understand what buyers actually need — not just what already exists.
Is this free?
Yes, all reports are free to read. We publish new product analyses regularly.