Discover Every Deal.
Effortlessly.
Stop searching. Start discovering. Mercury instantly shows you all relevant product alternatives—sorted by price—right where you shop.
Features That Delight
Every feature designed to make shopping smarter, faster, and more satisfying
Intelligent Matching
Advanced AI compares brands, models, specs, and prices to surface truly relevant alternatives.
Price-First Sorting
Always see the cheapest options first. High-confidence matches get special badges.
Lightning Fast
Results appear in seconds. No loading screens. Just instant discovery.
Multi-Retailer Coverage
Amazon, Fnac, Cdiscount, Darty, Boulanger, and more. We search where you'd search.
Smart Caching
Seen a product before? Mercury remembers, serving results instantly without re-fetching.
Privacy-First
No tracking. No selling your data. Mercury works for you, not advertisers.
How Mercury Works
Three simple steps to smarter shopping
Browse Normally
Shop on Amazon, Fnac, Cdiscount, or any supported retailer. When you land on a product page, Mercury quietly activates.
Click & Discover
One click on the Mercury icon reveals a sleek side panel showing every relevant alternative we found.
Explore & Save
Scroll through a curated list of similar products—from identical matches to exciting alternatives—all sorted by price.
Calculate Your Savings
See how much you could save with Mercury
Based on average savings of €35 per purchase
Loved by Shoppers
See what our users are saying
"Mercury saved me €80 on a phone by showing an identical model from a retailer I'd never heard of. 10/10."
"I'm obsessed. It's like having a personal shopping assistant that never sleeps. Found 15 alternatives to a jacket I wanted."
"Finally, a tool that just WORKS. No BS. No ads. Just clean results that help me shop smarter."
Supported Retailers
More retailers added regularly
Frequently Asked Questions
Is Mercury really free?
Yes. Completely free. No hidden costs, no premium tiers, no credit card required.
Will Mercury slow down my browser?
No. Mercury is lightweight and only activates when you're on a product page. Your browsing stays fast and smooth.
Does Mercury track my shopping habits?
No. We don't track, store, or sell your data. Your privacy is non-negotiable.
Which retailers does Mercury search?
Currently: Amazon, Fnac, Cdiscount, Darty, Boulanger, Zalando, La Redoute, Rakuten. We're adding more every month.
Ready to Discover Smarter Shopping?
Join 10,000+ users who never overpay again