Glassio is a powerful Mac inventory management software designed for eBay sellers. Import your eBay seller reports as CSV, track your full product catalog, monitor stock levels, and manage your entire listing inventory — all locally on your Mac without subscriptions or cloud accounts.
✓ eBay CSV Import✓ Stock Level Tracking✓ SKU Management✓ Offline — No Internet Needed✓ macOS Native✓ No Subscription
01 — The eBay Seller Workflow
How Glassio Works with eBay
eBay provides sellers with the ability to export their listing data as CSV files directly from Seller Hub. Glassio is built to work seamlessly with this workflow — import your eBay CSV reports into Glassio and immediately gain a clear, organized view of your entire inventory.
Export from eBay Seller Hub — Download your active listings, sold items, or inventory reports as CSV from eBay's Seller Hub or My eBay dashboard
Import into Glassio — Drag and drop or import your CSV file into Glassio in seconds
Manage centrally — Edit quantities, add notes, track costs, and organize your full eBay inventory catalog from one Mac-native workspace
Export back to eBay — When ready, export updated inventory data as CSV to bulk-upload changes back to eBay Seller Hub
No API key required. Glassio works entirely through CSV import and export — the same format eBay already supports. Your data stays on your Mac, never on a third-party server.
02 — What You Can Track
Full eBay Inventory Control on Mac
As an eBay seller, keeping accurate inventory records is critical to preventing overselling, managing restocks, and understanding your business performance. Glassio gives you the tools to stay on top of every listing:
Track stock quantities per SKU across your entire eBay catalog
Catalog items by category, condition, price, cost, and location
Monitor which items are running low and need restocking
Record purchase costs, sale prices, and margins for profitability tracking
Manage inventory across multiple storage locations or warehouses
Keep notes and custom fields per item for condition grading or provenance
Track high-value items like collectibles, antiques, or banknotes with precision
03 — Why Local-First is Better for eBay Sellers
Your Inventory Data, Your Control
Most inventory tools for eBay sellers require cloud accounts, monthly subscriptions, and give third-party platforms access to your sensitive business data. Glassio takes a different approach:
Local-first storage — All your eBay inventory data is saved on your Mac, not on external servers
No API key exposure — You don't connect Glassio directly to your eBay account, eliminating the risk of API key leaks or unauthorized access
Works offline — Manage your inventory anywhere, even without an internet connection
No subscription lock-in — Pay once (or download free), and your inventory tool is yours
Data portability — Export your full catalog at any time as CSV, giving you complete freedom to move or migrate your data
Perfect for high-volume eBay sellers, collectible resellers, and power sellers who need a reliable, private, and fast inventory management tool on their Mac.
04 — Who It's For
Built for Every Type of eBay Seller
Collectible & antique sellers — Track unique items with individual notes, grades, and valuations
Banknote & coin resellers — Catalog each note or coin with country, year, grade, and estimated value
Retail arbitrage sellers — Manage purchase cost, sale price, and ROI per SKU
Multi-platform resellers — Centralize inventory from eBay, Amazon, and Shopify in one place
High-volume power sellers — Import thousands of SKUs from CSV and manage them all on Mac
Glassio