ShipPeek
Know your margin before you publish.
ShipPeek sits inside your eBay and Poshmark listing flow and shows your true net margin live — after fees, shipping, and the costs sellers forget — then warns you before you publish a money-loser.
Read-only. Your listing data never leaves your device.
ShipPeek
−$14.35
Margin−95.7%
Net loss of $14.35 (biggest cost: shipping $16.20)
Fees as of 2025-02-14
True net, not gross
Final-value fees (category-aware on eBay), payment + per-order fees, promoted-listing %, shipping with dimensional weight, free-shipping loss, and a returns buffer you control.
In your flow
No separate calculator to tab into. The badge reads the listing you're already creating and updates as you type.
Private by design
Everything is computed locally in your browser. No analytics, no tracking, no data leaves your device.
How it works
- Open a listing on eBay or Poshmark — a small badge appears in the corner.
- It shows your net dollars and margin %, and turns red when a listing is underwater, naming the biggest cost so you know what to fix.
- Adjust the detected category or your defaults; everything recalculates instantly.
Pricing
Free
$0
- Live net margin on eBay
- Category-aware fees + shipping estimate
Pro
Subscription
- Pre-publish money-loser warning
- Poshmark support
- Secure payments via ExtensionPay / Stripe