Shopperwords vs Keyword Tool: a keywordtool.io alternative

Keyword Tool

A keyword website at keywordtool.io. One account covers 16 platforms, Amazon among them, along with Google and Bing. It runs in any browser, with nothing to install. Pro plans add an API that covers Amazon, so scripts can use it too. Its MCP server, for AI agents, covers only Google and Bing so far.

Shopperwords

A Chrome extension for Amazon only. When you type in Amazon’s search box, it shows its own dropdown in place of Amazon’s: Amazon’s suggestions, then the words buyers type before yours and after it. It works on 22 Amazon sites, with no account.

Both use Amazon’s autocomplete, the suggestions shoppers see as they type. The difference is where you do the work.

Keyword Tool

• Type a seed keyword on keywordtool.io and pick an Amazon market. It adds letters and numbers to your seed and collects Amazon’s suggestions.
• The free version lists keywords. Pro lists more, and adds estimated search volume and trends.
• Pro also takes your own list of up to 1,000 keywords and returns their volume, and exports to CSV or Excel.
• For Amazon, its volume numbers are modeled estimates based on clickstream signals, in its own words.

Shopperwords

• Type a keyword in Amazon’s own search box. Shopperwords asks Amazon’s autocomplete for your keyword plus each letter, and with words in front of it.
• Keywords appear in columns as you type: Amazon’s list, then words before and after yours. For “yoga mat” that’s 259 keywords, or 582 with Deep Expand.
• Free includes departments, exclude words, saved keywords and CSV export.
• Pro adds estimated monthly searches with a 12-month trend, and a builder that fills your backend Search Terms from your keywords.

Keyword Tool plan facts are from its Pro page. Facts as of 18 October 2026.

Keyword Tool

• Free: keywords without search volume.
• Starter: $88 a month, or $68 a month billed yearly. 50 requests a day.
• Growth: $188 a month, or $148 billed yearly.
• Scale: $388 a month, or $308 billed yearly.
• Agency: $788 a month, or $628 billed yearly.

Every plan covers all 16 platforms. There is no free trial; you can get a full refund within 30 days.

Shopperwords

• Free: no account and no time limit.
• Pro: $6.99 a month, or $49.99 a year. It starts with a 7-day free trial, and you can ask for a refund within 30 days of any charge.

A year of Keyword Tool Starter billed yearly costs $816. A year of Shopperwords Pro costs $49.99, for Amazon only.

• You research more than Amazon. One plan covers Google, Bing and 13 more platforms.
• You can’t install extensions, or work on a phone or tablet. Keyword Tool is a website.
• You automate. Pro includes an API with Amazon data. Its MCP server covers only Google and Bing.
• You already have a keyword list and need volume for all of it at once: Pro takes 1,000 keywords a request.
• You want more history: up to 48 months on the bigger plans.

• Amazon is the only place you sell, and you want to stay on Amazon while you research.
• You want keywords before and after yours, in separate columns, as you type.
• You want to export keywords without paying: CSV export is free.
• You want Amazon search volume for $49.99 a year.

1. Add Shopperwords to Chrome. It’s free.
2. Open any of the 22 Amazon sites it supports and type a keyword in the search box. Amazon’s suggestions come first, then the words buyers type before and after yours.
3. Click Deep Expand for twice as many keywords, then export them to CSV. You don’t need an account.
4. For search volume, start Pro’s 7-day free trial from pricing. You need a card, and you can cancel in the extension’s settings.

Keyword Tool and the other product names here are trademarks of their owners. Shopperwords isn’t affiliated with them.