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Fake Sale Detector Extension
Build a consumer shopping assistant that verifies whether a discount is legitimate using historical price tracking shown directly on retailer pages. The strongest pull is immediate money protection at the moment of purchase, with clear evidence that users already value this more than generic coupon tools.
Why this matters
You are shopping online, see a dramatic markdown, and still feel unsure whether the deal is real. Existing tools pile on coupon codes or price-drop badges but rarely tell you if the current offer is actually better than the normal selling price. So you either buy with doubt or open multiple tabs to compare manually. That creates friction on everyday purchases and makes people vulnerable to urgency tactics. A simple, inline price-truth layer solves a highly repeated consumer problem because it works at the exact moment when purchase decisions are made.
- · Built for Frequent online shoppers who buy on large marketplaces and retail sites several times per month and want to avoid fake discounts without doing manual research..
- · Most likely monetization: freemium.
The Pain · Narrative
You are shopping online, see a dramatic markdown, and still feel unsure whether the deal is real. Existing tools pile on coupon codes or price-drop badges but rarely tell you if the current offer is actually better than the normal selling price. So you either buy with doubt or open multiple tabs to compare manually. That creates friction on everyday purchases and makes people vulnerable to urgency tactics. A simple, inline price-truth layer solves a highly repeated consumer problem because it works at the exact moment when purchase decisions are made.
Score Breakdown
Market Signal
Go-to-Market
Desktop-first online shoppers who make at least 5 discretionary retail purchases per month on major marketplaces.
a few hundred thousand reachable early through browser-extension and deal-seeking audiences
SEO long-tail
$4.99/month
100 weekly active users who save at least one product and 20 convert to paid alerts within 30 days
MVP Scope · 1–2 weeks
- Build Chrome extension that detects supported retailer product pages
- Create product-page parser for title, current price, seller, and SKU-like fields
- Set up database schema for daily price snapshots by product URL
- Design simple inline widget showing current price versus historical median
- Launch landing page with email capture and install flow
- Add fake-discount logic using rolling 90-day baseline and threshold rules
- Implement saved-product watchlist with email alerts
- Connect a second retailer to validate multi-site parsing
- Instrument analytics for installs, widget views, and alert signups
- Run a small beta with 20 shoppers and collect accuracy feedback
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Retailers may change page structure often, making maintenance expensive for a small team.
- 2Consumers may like the feature but still expect it to be free because savings tools are often ad- or affiliate-funded.
- 3If the detector mislabels normal promotions as fake, users will stop trusting the product quickly.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
The discussion shows repeated enthusiasm for historical price visibility, with roughly ten comments emphasizing fake sales as a frequent problem. Several participants said price history changed buying decisions or would be valuable on its own, while others requested alerts and inline browsing support. This indicates a clear consumer wedge around price-truth verification rather than generic discount discovery.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
Ready-to-paste copy based on real Reddit community language — no editing required
Headline
Fake Sale Detector Extension
Sub-headline
Build a consumer shopping assistant that verifies whether a discount is legitimate using historical price tracking shown directly on retailer pages. The strongest pull is immediate money protection at the moment of purchase, with clear evidence that users already value this more than generic coupon tools.
Who It's For
For Frequent online shoppers who buy on large marketplaces and retail sites several times per month and want to avoid fake discounts without doing manual research.
Feature List
✓ Inline 90-day or 180-day price history on product pages ✓ Fake-discount flag based on historical baseline and current seller context ✓ Verified price alerts for saved products across retailers
Where to Validate
Share your landing page in r/Product Hunt · e-commerce — that's exactly where these pain points were discovered.
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