Which platforms does it cover?

Google, YouTube, Amazon, Bing, App Store, Play Store, eBay and Instagram. That breadth is the main reason to choose it over cheaper Google-only keyword sources.

Where does the keyword data come from?

Autocomplete suggestions rather than a keyword database, which surfaces long-tail phrasing database tools miss. Volume metrics are layered on top and are estimates.

Is it worth it for Google-only research?

Not really. Keywords Everywhere at $10 for 100,000 lookups or DataForSEO at roughly $60 per million keywords are far better value if Google is all you need.

Keyword Tool API review

Best non-Google keyword data

Reviewed by Eugene SuslovUpdated August 2026No affiliate links

Keyword Tool builds suggestions from autocomplete rather than from a keyword database, which surfaces long-tail phrasing that database-derived tools miss entirely. Its real differentiator is platform coverage: YouTube, Amazon, App Store, Play Store, eBay and Instagram alongside Google.

For anyone doing SEO outside classic web search, that is hard to replace. Very few APIs will tell you what people type into the App Store or into Amazon.

Who Keyword Tool API is for

Teams working across marketplaces and platforms: ecommerce sellers researching Amazon, app developers doing ASO, video teams optimising for YouTube. For Google-only keyword work it is expensive relative to the alternatives.

Strengths and limits

What it does well

The best multi-platform keyword coverage here, spanning YouTube, Amazon, App Store, Play Store, eBay and Instagram.
Autocomplete-derived suggestions surface real long-tail phrasing that database tools do not hold.
App Store and Play Store data makes it one of very few practical ASO keyword APIs.
Consistent output shape across platforms, so multi-channel research needs one integration.

Where it falls short

Expensive for Google-only work at $89 a month against Keywords Everywhere's $10 credit packs.
Annual billing on the advertised prices, so monthly costs more.
Volume figures are estimates and less reliable than Google Ads-sourced data.

Keyword Tool API pricing

Plans start at $89 a month for Pro Basic, $99 for Pro Plus and $199 for Pro Business, billed annually.

The value depends entirely on whether you need the non-Google platforms. For Google keyword volume alone this is poor value against Keywords Everywhere or DataForSEO. For Amazon and App Store data it is one of very few options at any price.

Check current Keyword Tool API pricing

Verdict

Buy it for the platforms nobody else covers. If your work spans Amazon, YouTube or app stores, it earns its keep quickly. If you only need Google volume, you are paying a large premium for coverage you will never touch.

Visit Keyword Tool API

Keyword Tool API FAQ

How much does the Keyword Tool API cost?
From $89 a month for Pro Basic, $99 for Pro Plus and $199 for Pro Business, billed annually.
Which platforms does it cover?
Google, YouTube, Amazon, Bing, App Store, Play Store, eBay and Instagram. That breadth is the main reason to choose it over cheaper Google-only keyword sources.
Where does the keyword data come from?
Autocomplete suggestions rather than a keyword database, which surfaces long-tail phrasing database tools miss. Volume metrics are layered on top and are estimates.
Is it worth it for Google-only research?
Not really. Keywords Everywhere at $10 for 100,000 lookups or DataForSEO at roughly $60 per million keywords are far better value if Google is all you need.

This is an independent review. We have no affiliate relationship with Keyword Tool API, earn nothing if you sign up, and no provider pays for placement in the directory. Prices were read from the vendor's own pages in August 2026 and change without notice.