Fixed-price · Fast delivery · Built by developers

We build the tools that make sellers more profitable

A tiny studio specializing in fee calculators, pricing tools and AI automations for ecommerce sellers. You get a working product at a fixed price — no bloated agency, no open-ended invoices.

✓ Delivered in days, not months
✓ Fixed price, agreed upfront
✓ Pure written communication
✓ You own the final product
Fixed-price packages

Calculator

One platform · one fee calculator
$249 fixed
  • A branded fee/profit calculator page
  • One marketplace's current fee rules
  • Mobile-first, ready to embed
  • 2 rounds of revisions
  • Delivered in ~4 days
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Profit Tool

Multi-platform comparison · most popular
$599 fixed
  • Compare fees & profit across 3–5 platforms
  • Suggested price for a target margin
  • Clean dashboard + downloadable result
  • 3 rounds of revisions
  • Delivered in ~7 days
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AI Automation

Custom build for your workflow
$999+ scoped quote
  • Automate a repetitive seller task
  • Connect the tools you already use
  • AI-assisted, built to your process
  • Handover + short guide
Describe it
Work you can see
SellerMath

100+ free, independently verified fee calculators for online sellers.

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Multi-Marketplace Copilot

Enter a product once, see pricing and profit on five platforms.

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Open-source fee engine

A tested, zero-dependency library of marketplace fee logic.

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How it works
Send the briefTell us the platform, inputs and what you want the result to be — in writing.
Get a fixed quoteWe confirm scope, price and delivery date before anything starts.
We build itYou get a working link, test it, and request your revisions.
It's yoursFinal files handed over and ready to put on your site.
Start a project
Your name Email What do you need? Describe it in a few lines
Thanks — your brief is in. We'll reply in writing with a fixed price and delivery date.