Review Analysis
Understand What Your Buyers Really Think
For Amazon, Shopify and DTC sellers
Working on an app? App Review Intelligence →
Stop Guessing Why Your 3-Star Reviews Happen.
Upload your Amazon or Shopify reviews and get an AI report in 20 seconds — a prioritized fix list where every finding cites the exact customer review.
Beta period: free. No credit card required. ~20 seconds per report.
What you get: a 3-page report where every issue links to the reviews that prove it.
Theme clustering
Complaints grouped into themes you can act on, ranked by share.
Sentiment alerts
Urgent negative shifts flagged before they hit your rating.
Cited evidence
Every action item links to the exact reviews that prove it.
This is a real sample built from synthetic demo data — open the full interactive report →
App Review Intelligence
Turn 1,000 App Reviews Into a Prioritized Fix List
For indie devs and mobile teams
Selling online? Review Analysis →
Returns Attribution
Find Out Why Buyers Return Your Products
Free Tools
Quick, free, no-login tools to understand your customer feedback better.
Review CSV Analyzer
Upload your review CSV and instantly see review count, average rating, star distribution, monthly trends, top keywords, and a quick rule-based insight.
Need the full story? AI review analysis →Star Rating Meaning
Enter any star rating and category to see what buyers really think — with industry benchmarks and actionable seller advice.
Find out why — full AI analysis →Review Summarizer
Paste up to 10 reviews and get an instant sentiment breakdown, top themes, and common complaints — rule-based, no AI required.
Have hundreds of reviews? Analyze them all →NPS Calculator
Paste your survey scores (Excel / Google Sheets friendly) and instantly calculate your Net Promoter Score with a Promoter / Passive / Detractor breakdown — free, in your browser.
Read the comments behind the score →Survey Response Analyzer
How to export Google Forms responses as CSV and export SurveyMonkey results, then paste up to 50 open-ended answers for an instant AI mini summary — a free survey response analyzer for open-ended questions, no spreadsheets wrangling required.
Analyze product reviews at scale →App Review Exporter
Step-by-step guides to export app store reviews: download Google Play reviews CSV from Play Console and export App Store reviews with a free script. Then paste up to 50 reviews for an instant mini summary — a free app review analysis tool.
Turn 1,000 reviews into a fix list →Amazon Review Exporter
How to export Amazon reviews the compliant way: request your own review history as data files from Amazon, download the seller Feedback report from Seller Central, then analyze any review CSV with AI for free — no scraping tools.
Analyze your review CSV with AI →Judge.me Reviews Analyzer
How to export Judge.me reviews to CSV from your Shopify admin in a few clicks, then paste up to 50 reviews for an instant AI mini summary — a free judge.me review analysis tool, no scraping required.
Analyze all your Shopify reviews →Amazon Review Summarizer
Paste any Amazon ASIN or product URL and get an instant AI summary of the top negative review themes — shipping, quality, sizing — free, no sign-up, 3 summaries per day.
Analyze all your reviews with AI →Fake Review Checker
Paste a review page URL and the reviews to get a transparent checklist of fake-review signals — 5-star bursts, generic praise, repeated wording — every check shows its math. Free, runs in your browser.
Turn review intelligence into your edge →Return Reason Classifier
Upload your Amazon Returns Report CSV and instantly see return reason codes grouped into six categories — size & fit, not as described, quality, shipping, buyer intent — with top ASINs and monthly trends. Free, runs in your browser.
Cross-validate returns against reviews →倒班日历 Shift Calendar
免费倒班日历：四班三倒、两班倒、做几休几，输入锚定日一键生成全年班表，导入手机日历或分享给家人同事。免安装免登录。
More free seller tools →劳动法计算器（加班费·补偿·年假）
免费劳动法计算器：加班费（1.5/2/3倍）、被辞退经济补偿 N+1 与 2N 赔偿金、未休年假折算，逐项附《劳动法》《劳动合同法》法条引用，结果可导出保存。仅供参考，不构成法律意见。
分析职场评价与避坑参考 →信用证日期计算器（交单期·效期顺延）
免费信用证（L/C）日期计算器：输入最迟装船日与效期，一键推算最迟交单日，UCP600 第29条节假日顺延自动算（中国大陆/香港/新加坡假日表），效期冲突提前预警，结果可复制存档。仅供参考，交单前请与银行复核。
查看更多免费工具 →All tools are free, no signup required.
How It Works
Upload your data
Drop in a review or survey CSV from Amazon, Shopify, Play Console, or Google Forms. No account linking, no scraping.
Get an AI report
Themes, sentiment shifts, urgent alerts and competitive insights. A developer-grade report in about 20 seconds.
Ship the fix list
A prioritized to-do list ranked by user impact, each item citing real reviews as evidence.
Get notified when we launch
KnowVault is in private beta. Leave your email and we'll tell you the moment it opens — no spam.
Frequently Asked Questions
What does KnowVault do?
KnowVault analyzes your customer feedback with AI: product reviews from Amazon or Shopify, app store reviews, and survey responses. Every report turns that raw feedback into a prioritized, evidence-cited action list.
Are the free tools really free?
Yes. All 11 tools run entirely in your browser. No login, no upload to servers, no credit card required.
How much does a full AI analysis cost?
Two tracks: a one-time deep report for $19 (pay once, no subscription), or a monthly plan at $19/mo for continuous monitoring. Beta-period reports are free.
Is my data safe?
The free tools never send your data anywhere: all calculations run in your browser. For a full AI analysis, your CSV is the only input. No store account access, no authorization, no scraping.