For multi-platform sellers

Know your profit.
Reply faster.

MarketHelper helps multi-platform sellers respond to buyers in seconds and see real profit after fees and shipping — so you close better deals and keep more money.

Free to start · Works across Facebook, eBay, OfferUp & more
Total profit · this month
$1,240
net after cost, fees & shipping
+18%
Buyer · “Would you take $150? Can pick up today.”
“Thanks! I could do $175 for a quick pickup — does that work?”
Firm Friendly Short Copy ✓
Minimum price to accept $67.21
after 13.25% fees + $8 shipping
The problem

Selling across marketplaces creates the same headaches

Facebook Marketplace, eBay, OfferUp, and more — different apps, same friction.

Lowball offers and time-wasting messages
Guessing whether an offer is actually profitable
No clear record of what you made
Mental load from constant back-and-forth

Most tools are built for high-volume power sellers and cost $50+/month. You just need something simple that helps you move faster and stay clear on profit.

How it works

Three steps. Seconds, not minutes.

1

Paste a buyer message

Copy any message from any platform and drop it in.

2

Get a clear reply and profit check

A solid reply plus the real net profit for that deal.

3

Track what you actually made

Every sale logged, net of fees and shipping.

Key features

Everything you need. Nothing you don’t.

Smart replies

Paste any buyer message and get firm, friendly, or short reply options with one-tap copy.

Real profit tracking

Log cost, sale price, fees, and shipping so you see true net profit — not just the sale amount.

Net Profit Calculator

Set the profit you want to keep and instantly see the minimum price to accept after platform fees and shipping.

Simple seller ledger

This month, year-to-date, and all-time profit in one clean view. Useful for personal tracking and tax time.

Works across platforms

Facebook Marketplace, eBay, OfferUp, Mercari, and more. No complicated integrations required.

One paste-in box. Every platform.

Facebook eBay OfferUp Mercari & more
Who it’s for

Built for sellers, not enterprises

Side sellers, flippers, and anyone selling across multiple marketplaces who wants speed and clarity without enterprise software.

Pricing

Simple and affordable

Free for up to 3 listings
Premium from
$3–$6/month
when you need more
No enterprise pricing Cancel anytime Multi-platform
Get early access

Stop guessing.
Start knowing your profit.

Join the early access list — be first to try MarketHelper.

✓ You’re on the list — we’ll email you at .