Sell on Amazon and Shopify with fewer expensive mistakes.
Tool comparisons, agency-selection guides and app-review lessons from someone who runs Amazon ads and builds Shopify apps, with every affiliate link disclosed.
A field guide for Amazon and Shopify sellers
Ecom Field Guide covers the decisions that cost sellers real money: which tools and agencies are worth paying for, how Amazon advertising and Shopify app review actually work, and where the common mistakes are. It is written by an operator rather than an affiliate marketer, and every page shows when it was last checked.
The directory lists tools, agencies and apps we could verify, with the date we checked and the reason each is listed. Some links are affiliate links, and we also own some of the products we mention, so we say so on the page where it matters and in one place that explains everything.
Start here: Directory · How we review · Our Shopify apps · Disclosure · About the author
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Latest guides
- Amazon Brand Analytics: Search Query Performance Explained
What Amazon's Search Query Performance report shows, how Brand and ASIN views differ, and how to compare it with your ad data to find where to buy more share.
Updated Oct 2026 - Amazon Title Rules 2026: 75 Characters, Highlights, Suppression
Amazon's 2026 title rules: the 75-character limit from July 27, the new 125-character Item Highlights field, banned characters, and how to rewrite titles in bulk.
Updated Oct 2026 - Amazon Negative Keywords: How to Find and Apply Them
Amazon negative keywords method: pull the search term report, set a spend threshold from your own margin, choose exact or phrase, and avoid over-negating.
Updated Oct 2026 - Amazon PPC Metrics That Matter: And the Ones That Mislead
ACoS, ROAS, TACoS, CTR, CVR, CPC and impression share: what each metric answers, when it misleads, and how agencies should report them without hiding losses.
Updated Oct 2026 - Amazon Tools for Agencies: A Category Guide to What Agencies Use
Amazon agencies need account access, bid automation and reporting. A category guide to tool types, with published prices as of October 2026 and conflicts disclosed.
Updated Oct 2026 - Amazon Sponsored Products Structure: Auto, Manual, Match Types
How to structure Amazon Sponsored Products campaigns: auto vs manual targeting, broad, phrase and exact match, bids by match type, and when to split campaigns.
Updated Oct 2026 - Amazon PPC Software Compared: What Each Type Does
Rules-based, AI-bidding and agency PPC software compared by type, with published prices as of October 2026 and the author's AdSpark conflict disclosed. No ranking.
Updated Oct 2026 - How to Choose a Shopify Agency Without Getting Burned
A decision guide to hiring a Shopify agency: scope first, fixed vs hourly, questions to ask, red flags, and why every agency list (including ours) is biased.
Updated Oct 2026 - Klaviyo vs Mailchimp for Shopify Stores: Pricing and Features
Klaviyo and Mailchimp compared for Shopify on published free plans, paid tiers, flows and store sync as of October 2026. The author uses Klaviyo.
Updated Oct 2026
Free planning tools
All tools →- FreeACoS Break-Even Calculator
Work out unit profit, break-even ACoS, target ACoS, break-even ROAS and a TACoS plan for an Amazon product.
- FreeAmazon PPC Bid and Budget Planner
Turn price, conversion rate and target ACoS into a max break-even CPC, a starting bid and a daily budget.
- FreeAmazon Negative Keyword Finder
Paste a Sponsored Products search term report and get negative keyword candidates by your own click and spend thresholds. Runs in your browser; nothing is uploaded.
- FreeAmazon Title Length Checker
Count title characters against a configurable limit, flag risky characters, repeated and all-caps words, and check backend search term bytes and Item Highlights.
- FreeShopify App Review Pre-Submission Checklist
Interactive, printable checklist of the manual checks that catch common Shopify App Store rejections, with requirement IDs and progress.
- FreeShopify Subscription App Fee Calculator
Compare the monthly cost of Shopify subscription apps at your order volume and average order value, with editable fees and break-even points.
How we make these guides
Official sources first
Fees, hours and rules come from operators and official pages where we can find them, with the source noted in our research.
Honest about gaps
When we cannot verify a number we say so and give a range, instead of printing false precision.
Dated and kept current
Every guide shows when it was last updated, and we re-check prices and schedules on a regular cycle.
Free tools, no sign-up
Budget calculators, maps and checklists that run in your browser. Nothing is stored or sold.