Free tools
Calculators and scorers for people who sell online
Ten tools, no sign-up, no card. Each one is built from the same data as the 82 reviews on this site, and each tells you which paid tool to look at only if the result says you need one.
Amazon sellers
4 toolsFBA Profit Calculator
Price, landed cost, category and dimensions in. Referral fee, FBA fulfilment fee with the 2026 surcharge, storage, PPC and returns out, with net margin, ROI and the break-even price and ACoS.
- In
- Price, cost, size, category
- Out
- Profit per unit and margin
- Takes
- 2 min
Star Rating Calculator
Current rating, number of ratings and the target you want. See how many new reviews it takes at a realistic mix, what one 1-star review costs you, and how long it takes at your review rate.
- In
- Rating and count
- Out
- Reviews needed
- Takes
- 30 sec
ACoS and TACoS Calculator
Ad spend, ad sales and total sales in, ACoS, TACoS and ROAS out. Add your price, cost of goods and fees to get a break-even ACoS that accounts for Amazon's cut.
- In
- PPC figures
- Out
- Break-even and target ACoS
- Takes
- 1 min
Search Term Harvester
Upload an Amazon search term report. Get negatives to add, winners to promote to exact match, ASINs to target and duplicate terms across ad groups, with a bulk sheet export. Runs in your browser; nothing is uploaded.
- In
- Search term report CSV
- Out
- Negatives, winners, bulk sheet
- Takes
- 2 min
Shopify sellers
1 toolAny platform
5 toolsAI Stack Quiz
Eight questions about your platform, revenue, biggest time sinks and budget. Returns one tool per job, with the monthly cost at list price and with reader deals.
- In
- 8 answers
- Out
- A tool stack with prices
- Takes
- 2 min
Product Listing Scorer
Paste a title, bullets and description. Scored against Amazon or Shopify limits and conventions, with the weakest section called out and a fix for each.
- In
- Listing copy
- Out
- Score out of 100 and fixes
- Takes
- 1 min
Seller Software Price Index
Every reviewed tool's entry price, annual discount and reader deal in one filterable table, with medians by category and what changed this month. The data behind the monthly Price Index report.
- In
- Filters
- Out
- Prices, medians, changes
- Takes
- 1 min
AI Tool Comparison
Any two or three of the reviewed tools side by side: price with reader deal, scores, platforms, pros and cons and the verdict. The link updates as you pick, so you can share it.
- In
- Pick 2 or 3 tools
- Out
- Side-by-side ledger
- Takes
- 30 sec
Blog GEO Scorer
Paste an article and see how likely it is to be cited by ChatGPT, Perplexity and Google AI Overviews: answer-first structure, statistics, sources, author signals and schema.
- In
- Article text or HTML
- Out
- Score out of 100 and PDF
- Takes
- 1 min
Where do the numbers come from?
Tool prices and deals are read from the review database and checked monthly. Amazon fee defaults follow the current fee schedule. Every calculator shows its formula, and anything that is a rule of thumb rather than a fact is labelled as one. See how we test.
Is anything stored?
No. Every tool runs in your browser. The search term harvester never uploads your report, and the scorers never send your copy anywhere. If you choose to email yourself a result, only that result and your address are sent.
Missing a calculator you use every week?
Tell me what it is and what you paste into it. The next one gets built from reader requests. Send a note.