What is SoldinSight?
SoldinSight is a free Chrome extension designed to help anyone on eBay make informed decisions by providing instant access to sold listing history and accurate profit calculations.
Whether you're a casual seller clearing out unwanted items or a full-time reseller managing hundreds of listings — SoldinSight gives you the data you need to price confidently and sell profitably.
🎯 Our Mission: Make eBay market research accessible, fast, and privacy-focused for everyone.
Key Features
📊
Sold History
Complete sold listing data at your fingertips
💰
Profit Calculator
Accurate eBay fee calculations
⚡
Smart Caching
80%+ cache hit rate for instant results
🌍
International
6 eBay domains supported
🔒
Private
No tracking or data collection
🆓
Free Forever
No subscriptions or hidden costs
🔖
Save Items
Save up to 50 listings with full variation support
📋
Export CSV
Export your saved items to Excel/CSV anytime
🔥
Demand Score
30-day demand rating with price pattern & trend signals
⏱️
Period Filters
Filter sold history by 5d, 10d, 15d, 30d, 60d, or All time
🔍
Similar Listings
Smart eBay search using brand, model & identifiers
🛒
Google Shopping
One-click search on Google Shopping with smart query
☕
Support Developer
Optional donate button — free forever, no strings attached
🌙
Dark / Light Mode
Toggle theme in the modal header — preference saved automatically
🔗
Verify on eBay
Clickable item number links directly to eBay's purchase history page
🔍
Search Page Integration
Check Sales button on every search result card — no need to open each listing
By The Numbers
1.0
Version
6
eBay Sites
5
Currencies
80%+
Cache Hit Rate
24h
Cache Duration
0
Data Collection
Our Story
SoldinSight was born from a simple frustration: researching eBay sold prices was slow and tedious. Clicking through multiple pages, manually calculating fees, and keeping track of sold items took valuable time away from actual selling.
We built SoldinSight to solve this problem. Our goal was to create a tool that:
- Provides instant access to sold history
- Calculates profits automatically
- Works fast with smart caching
- Respects user privacy completely
- Remains free for everyone
Version History
v1.0.0 - February 15, 2026
Initial Public Release
- Sold history viewer with full date/time and raw eBay data in the table
- Profit calculator with accurate eBay fees (2026 rates, all 6 domains)
- Multi-currency support (USD, GBP, EUR, AUD, CAD)
- Multi-region support (US, UK, Germany, France, Australia, Canada)
- Private Seller mode for UK & Germany — 0% FVF, ROF waived, correct international fees
- Variation filtering for products with multiple options
- Sales velocity and statistics tracking
- Smart caching (24-hour TTL, 200-item capacity)
- Enterprise security (XSS protection, CSP)
- Manifest V3 compliant
- Privacy-first design
- 6 international eBay sites
- Save Items — save up to 50 listings with per-variation support
- Export CSV — export saved items including image URL, seller, variation, and sold data
- Period filters — 5d, 10d, 15d, 30d, 60d, All time with dynamic Total Sales label
- Similar Listings — smart query using brand, model, UPC/EAN/MPN with junk value filtering
- Google Shopping — direct link to Google Shopping tab with same smart query logic
- Demand Score — LOW / MEDIUM / HIGH / VERY HIGH with trend signals
- Donate button (☕) in modal header — optional Buy Me a Coffee support link
- Multilingual offer status support (EN, DE, FR) — declined/expired offers excluded from all counts
- Dark / Light mode toggle — 🌙/☀️ button in modal header, preference saved in chrome.storage
- Clickable eBay Item No. — links to eBay purchase history page for data verification
- Search page integration — Check Sales button on every eBay search result card; fetches sold history + listing details in parallel via background service worker
- Live Stats & lifetime sold from search — watching counts, cart counts, and total sold pulled from listing page HTML and embedded JSON
- Seller name accuracy fix — JSON-based extraction prevents brand names from being mistaken for seller names
- Bulk delete — select and delete multiple saved items at once, with Delete All option
- Demand Score — fixed 30-day demand rating (LOW / MEDIUM / HIGH / VERY HIGH) with price pattern and trend signals
Technology
SoldinSight is built with modern web technologies and best practices:
- Manifest V3: Latest Chrome extension standard
- Smart Caching: Chrome Storage API — 24-hour TTL, up to 200 items
- Security First: XSS protection, CSP, input validation
- Rate Limiting: Respects eBay's servers
- Modular Architecture: Clean, maintainable code
Privacy Commitment
🔒 Your Privacy is Our Priority
We take privacy seriously. SoldinSight:
- ✅ No data collection - We don't collect any personal information
- ✅ No tracking - No analytics, cookies, or tracking pixels
- ✅ Local storage only - All data stays on your device
- ✅ No external servers - Direct eBay access only
- ✅ Open source ready - Code can be reviewed
- ✅ HTTPS only - Secure connections always
Read our full Privacy Policy for details.
Supported Platforms
eBay Sites:
- 🇺🇸 eBay.com (United States) - USD
- 🇬🇧 eBay.co.uk (United Kingdom) - GBP
- 🇦🇺 eBay.com.au (Australia) - AUD
- 🇨🇦 eBay.ca (Canada) - CAD
- 🇩🇪 eBay.de (Germany) - EUR
- 🇫🇷 eBay.fr (France) - EUR
Browsers:
- ✅ Google Chrome (recommended)
- ✅ Microsoft Edge
- ✅ Brave Browser
- ✅ Opera
- ❌ Firefox (not compatible - different manifest format)
- ❌ Safari (not compatible - different extension API)
What's Next
We're constantly working to improve SoldinSight based on user feedback. Got an idea? Let us know!
Not Affiliated with eBay
⚠️ Independent Tool Disclaimer
SoldinSight is an independent third-party research tool and is NOT affiliated with, endorsed by, or sponsored by eBay Inc.
What this means:
- This is not an official eBay product or service
- eBay does not endorse or support SoldinSight
- We access only publicly available eBay data (same data visible to all users)
- Users must comply with eBay's Terms of Service when using this tool
- This tool is intended for eBay sellers to inform pricing and profit decisions
Data Usage: SoldinSight displays publicly accessible sold listing information from eBay - the same data any user can view by clicking "Sold listings" on an eBay item page. We simply organize this public information in a more convenient format for research and analysis.
All eBay trademarks, service marks, and company names are the property of eBay Inc. Any references to eBay are for descriptive purposes only.
Open Source
We believe in transparency. While not currently on GitHub, our code follows open source principles:
- Clean, readable code
- Comprehensive comments
- Modular architecture
- Security best practices
Interested in the code? Feel free to inspect it via Chrome DevTools or contact us.
Credits & Acknowledgments
SoldinSight was made possible by:
- Chrome Extension APIs - Google's powerful extension platform
- eBay - For providing public sold listing data
- Our Users - Thank you for your feedback and support!
Get Started
Ready to supercharge your eBay research?
- Install SoldinSight from the Chrome Web Store
- Visit any eBay listing
- Click the "Sold History" button
- Start making data-driven decisions!
Need help? Check out our Help Center or contact us.
💚 Thank you for using SoldinSight!
We're here to help you succeed on eBay.