Free Ecommerce Tools That Run in Your Browser
Calculators and checkers we built for our own work and published as-is. No signup, no data collected, every rate and rule visible and editable. Use them, then read the guide behind each one.
Pick a Tool, Get a Number
Amazon FBA Fee Calculator
Size tier from packaged dimensions, 2026 fulfillment fee by price band, referral fee, storage, ad spend, returns, and net margin per unit. Every rate editable.
AI Crawler Checker
Enter a URL and see whether GPTBot, ClaudeBot, PerplexityBot, Googlebot and 14 more are allowed, blocked in robots.txt, or blocked by a firewall, plus llms.txt presence.
llms.txt Generator
Build a valid llms.txt from your brand summary and key pages, copy or download it, then follow the WordPress or Shopify install steps.
Amazon Listing Character Counter
Live counts against the 75-character title limit, 125-character Item Highlights, bullets, 250-byte search terms and description, with flags for promotional words and banned symbols.
Updated automatically
Every Tool, Newest First
Free Tools
Amazon Agency Cost Calculator: 4 Models vs a Hire
Free Amazon agency cost calculator: compare percent of sales, percent of ad spend, a flat retainer, our published PPC fee and an in-house hire.
Amazon PPC
ACoS, TACoS and Break-Even ACoS Calculator
Free Amazon ACoS calculator: ACoS, TACoS, ROAS, break-even ACoS, target ACoS for your margin and profit per ad-driven unit, with every formula shown.
Amazon Creative
Amazon Content Budget Calculator: Cost per SKU
Free calculator: enter your SKU count and pick photo, video, design, copy or bundles to see your Amazon listing content total and cost per SKU at our prices.
Free Tools
Amazon Listing Quality Scorecard: Score Out of 100
Free 18-point Amazon listing scorecard: rate title, bullets, images, video, A+, reviews and price for a live score out of 100 and the three fixes to make first.
Free Tools
TikTok Shop Profit Calculator: Net Per Order After Fees
Free TikTok Shop profit calculator: net per order after TikTok's 6% fee, creator commission and ads, plus margin, break-even commission and monthly profit.
Email Marketing
Email Flow Revenue Calculator: What Flows Should Make
Free email flow revenue calculator: expected monthly flow revenue, its share of store revenue, and the gap against a labeled, editable 2026 benchmark.
Guide
Amazon Listing Character Counter: Title, Bullets, Keywords
Live counter for Amazon listings: the 75-character title limit (July 27, 2026), 125-character Item Highlights, bullets, 250-byte search terms and description.
Guide
llms.txt Generator: Build and Install Yours in 5 Minutes
Free llms.txt generator in the llmstxt.org format. Enter your brand summary and key pages, copy or download the file, then install it on WordPress or Shopify.
Guide
Amazon FBA Fee Calculator 2026: Fees, Size Tier & Net Margin
Free 2026 FBA fee calculator: size tier from dimensions, fulfillment fee by price band, referral, storage, ads and returns. See real net margin per unit.
Guide
AI Crawler Checker: Which AI Bots Can Read Your Site
Free tool: enter a URL and see whether GPTBot, ClaudeBot, PerplexityBot, Googlebot and 14 more are allowed, blocked in robots.txt or blocked by your firewall.
Three Rules for Every Tool Here
Nothing leaves your browser
Inputs are processed in JavaScript on the page. No account, no email gate, nothing stored. If a tool ever needs to fetch something (a crawler checker reading another site's robots.txt), the page says exactly what is sent.
Every rate and rule is visible and dated
Fee cards and platform limits change. Each tool shows the date its data was verified, links the source, and lets you edit the numbers to match what you see in your own seller account.
Each tool has a guide behind it
A calculator gives a number; the guide explains what to do with it. Every tool links to the long-form article it was built from, and the guides link back.
Want Us to Run the Numbers With You?
Book a free call and bring a product. We will work through fees, margin, and what to fix first, live.