The Keyword Tool API Insider’s Guide
Everything we know about Keyword Tool API in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Keyword Tool API
The Insider’s Guide
Keyword suggestion and search volume API across 17 search platforms
Every plan, grade, refund rule and rival among SERP and SEO data APIs, read from Keyword Tool API’s own pages.
Made by Essential Apps LLC and Key Tools Limited · checked Oct 23, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Keyword Tool API’s own pages, its app-store listings and our grades. Every fact in it is on Keyword Tool API’s page too, where it is kept up to date. Checked Oct 23, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.8
GPA, above 0 of the 38 other SERP and SEO data APIs we grade
Keyword Tool API gives programmatic access to the data in KeywordTool.io: keyword suggestions mined from the autocomplete of Google, YouTube, Amazon, TikTok, Perplexity and 12 other platforms, search volume for up to 1,000 keywords per request, cost per click and competition, and the keywords Google links to a competitor's URL. It comes with every Keyword Tool Pro plan, sharing one daily request limit with the web app and the MCP server.
To get you started, here are 8 things to know about Keyword Tool API, taken from its own pages and our grades.
No rating on record, and one daily request pool is shared with the web app and MCP.
- 1
Best for keyword volumes from Google, YouTube and Amazon
Keyword Tool API gives code access to KeywordTool.io's suggestions from 17 platforms and search volumes for up to 1,000 keywords a request.
- 2
Paid plans start at $68 a month
As its pricing page puts it: $68 per month for 50 requests a day, billed annually ($88 billed monthly).
- 3
It runs on Web
Web.
- 4
Search volume endpoint
Send 1 to 1,000 keywords per request for monthly volume, a monthly breakdown, cost per click and competition, for one location and language.
- 5
Keyword suggestions from 17 sources
Autocomplete suggestions, related keywords, questions and prepositions from Google, YouTube, Bing, Copilot, Perplexity, Amazon, TikTok, Reddit and more.
- 6
Competitor keywords
Pass one URL to get up to 2,000+ keywords Google associates with it, with volume, cost per click and low and high top-of-page bids.
- 7
A 1.8 GPA, above 0 of 38
That is against the other SERP and SEO data APIs we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
To replace Keyword Tool API you would be making search volumes for millions of keywords, gathered and kept up to date. That is not a weekend's work, with an AI app builder or without one.
Keyword Tool API at a glance
- Pricing
- Paid, from $68 per month for 50 requests a day, billed annually ($88 billed monthly)
- Free plan
- No
- Free trial
- None stated
- Runs on
- Web
- Made by
- Essential Apps LLC and Key Tools Limited
- Category
- SERP & SEO Data APIs
- Our grade
- 1.8 GPA, weak
The report card
Best for keyword volumes from Google, YouTube and Amazon
Keyword Tool API gives code access to KeywordTool.io's suggestions from 17 platforms and search volumes for up to 1,000 keywords a request. There's no trial, only Google and Bing volumes come from the ad planners, and Starter's 50 requests a day are shared with the web app and MCP.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | Starter is $68 a month on yearly billing ($88 monthly) for 50 requests a day, above this category's dearer quarter but short of its dearest tenth. The same plan also covers the web app and MCP. |
| Free plan and trial | F | Nothing free for the API: no trial, only a 30-day money-back guarantee, which isn't a trial. A free Guest MCP gives suggestions with volume on the first 5 keywords, but no API access. |
| Features | C | Search volume for up to 1,000 keywords a request, suggestions from 17 platforms, competitor keywords and a sandbox. The listing's own gap: only Google and Bing volumes come from the ad planners, and the rest are modeled estimates. |
| Ease of use | C | Judged on how fast a developer gets a first result: a sandbox base URL and a public OpenAPI 3.1 file for Postman or generated clients. No rating on record, and one daily request pool is shared with the web app and MCP. |
| Platforms and integrations | B | Web, with an API, an MCP server for Claude, ChatGPT and Cursor, and an OpenAPI file for Postman. No desktop or phone app, so B is the top. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Keyword Tool API is for
- Fits if you want Google and Bing search volumes pulled into your own tools or warehouse
- Works for long-tail research on YouTube, Amazon and TikTok as well as Google
Who it is not for
- Not for you if you want to try it first, as there's no trial, only a 30-day money-back guarantee
- Tight if you run many jobs, since Starter's 50 requests a day are shared with the web app and MCP
- Watch out: volumes for platforms other than Google and Bing are modeled estimates, not planner data
- Pricey if you pay monthly, at $88 against $68 on yearly billing
Good to know
Good for
- Pulling Google and Bing volumes into your own tools or data warehouse
- Long-tail keyword research for YouTube, Amazon and other platforms
- Giving AI assistants real keyword data instead of guessed volumes
Worth knowing
- The API needs a Keyword Tool Pro plan; there is no free trial, but every plan has a 30-day money-back guarantee.
- One daily request pool, from 50 on Starter to 400 on Agency, is shared by the web app, the API and MCP, and resets every 24 hours.
- Only Google and Bing volumes come from the ad planners; the other platforms' volumes are modeled estimates from clickstream data.
- A free Guest MCP gives Google and Bing suggestions with volume on the first 5 keywords, but no API access.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$68
A month to start
Keyword Tool API is a paid product, starting at $68 per month for 50 requests a day, billed annually ($88 billed monthly).
The same plan also covers the web app and MCP.
Starter
$68
per month for 50 requests a day, billed annually ($88 monthly)
Search volume for up to 50,000 keywords a day, 12 months of history, all 17 platforms, web app, API and MCP.
Growth
$148
per month for 100 requests a day, billed annually ($188 monthly)
Search volume for up to 100,000 keywords a day and 24 months of history.
Scale
$308
per month for 200 requests a day, billed annually ($388 monthly)
Search volume for up to 200,000 keywords a day and 48 months of history.
Agency
$628
per month for 400 requests a day, billed annually ($788 monthly)
Search volume for up to 400,000 keywords a day and 48 months of history.
Enterprise & Custom
Custom
Higher daily request and keyword limits, custom API and MCP usage, procurement paperwork and bank-transfer payment, after a demo.
Read from keywordtool.io on Oct 23, 2026.
Ways to pay less
Annual discount
Save over 20% with annual billing
Keyword Tool's pricing lists annual billing at over 20% less: Starter is $68 a month billed annually instead of $88 billed monthly.
Stated on keywordtool.io
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Keyword suggestion and search volume API across 17 search platforms. Here is what it does, as its own site describes it, and what it covers: public API, AI features, keyword research.
The listing's own gap: only Google and Bing volumes come from the ad planners, and the rest are modeled estimates.
- Search volume endpoint
- Send 1 to 1,000 keywords per request for monthly volume, a monthly breakdown, cost per click and competition, for one location and language.
- Keyword suggestions from 17 sources
- Autocomplete suggestions, related keywords, questions and prepositions from Google, YouTube, Bing, Copilot, Perplexity, Amazon, TikTok, Reddit and more.
- Competitor keywords
- Pass one URL to get up to 2,000+ keywords Google associates with it, with volume, cost per click and low and high top-of-page bids.
- Deep localization
- Google data for 190+ countries, 68,000+ locations and 50+ languages; Bing planner data for 6 countries, or device data for 32.
- Sandbox and OpenAPI spec
- A sandbox base URL for testing without using quota, and a public OpenAPI 3.1 file for Postman collections or generated clients.
- MCP server
- Connect Claude, Cursor or ChatGPT to the same data through MCP, drawing on the plan's shared daily request pool.
Where it runs
- Web
What it works with
- Claude
- ChatGPT
- Cursor
- Postman
Keyword Tool API is made by Essential Apps LLC and Key Tools Limited.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
0/38
Other SERP and SEO data APIs it is graded above
Keyword Tool API's GPA of 1.8 is higher than 0 of the 38 other SERP and SEO data APIs we grade.
It stands best on platforms and integrations (B, above 9 of 38) and worst on free plan and trial (F, above 0).
Its paid plans start at $68 a month, against a middle price of $29.49 for the category: 21 of the 25 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4. 8 tools score higher and cost less.
Each grade against the category
Every bar is all 39 SERP and SEO data APIs we grade, cut by the letter each got. Keyword Tool API’s own letter is outlined.
- CValue for moneyAbove 1 of 38
- FFree plan and trialAbove 0 of 38
- CFeaturesAbove 1 of 38
- CEase of useAbove 0 of 38
- BPlatforms and integrationsAbove 9 of 38
Price against what you get
Each dot is one of 26 SERP and SEO data APIs. Further left costs less; higher up scores better on features, ease of use and platforms. Keyword Tool API is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace Keyword Tool API you would be making search volumes for millions of keywords, gathered and kept up to date. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 38 of the 38 other SERP and SEO data APIs grade higher. It costs $816 a year.
What you could not
- Search volumes for millions of keywords, gathered and kept up to date.
- It plugs into other products, Claude, ChatGPT and Cursor among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
What this rests on. Keyword Tool API’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
DataForSEO, KeywordTool.io, Keywords Everywhere, Semrush and Google Keyword Planner
The 5 tools Keyword Tool API is most often weighed against, with where each one differs from it.
- 2.8GPA
DataForSEO
Free trial · from $50
Pay-as-you-go APIs for SERP, keyword, backlink and AI mention data.
- DataForSEO also covers site audit, backlink analysis, AI search visibility and sERP API.
- 2.4GPA
KeywordTool.io
Free plan · from $68/mo
Autocomplete keyword ideas from Google and 16 other search platforms.
- KeywordTool.io has a free plan. Keyword Tool API does not.
- KeywordTool.io also covers app store optimization and youTube SEO.
- 2.8GPA
Keywords Everywhere
Free plan · from $7/mo
Browser extension that shows search volume on the sites you browse.
- Keywords Everywhere has a free plan. Keyword Tool API does not.
- Only Keyword Tool API lists a web app.
- Only Keywords Everywhere lists a browser extension.
- 2.2GPA
Semrush
Free plan · from $117.33/mo
SEO suite for keyword research, rank tracking and AI search visibility.
- Semrush has a free plan. Keyword Tool API does not.
- Semrush also covers reports, rank tracking, site audit and backlink analysis.
- 2.8GPA
Google Keyword Planner
Free
Free keyword ideas, search volumes and bid estimates inside Google Ads.
- Google Keyword Planner has a free plan. Keyword Tool API does not.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Keyword Tool API free?
No. Keyword Tool API is a paid product, starting at $68 per month for 50 requests a day, billed annually ($88 billed monthly).
How much does Keyword Tool API cost?
Keyword Tool API lists 5 plans. Starter: $68 per month for 50 requests a day, billed annually ($88 monthly).
What platforms does Keyword Tool API work on?
Keyword Tool API is available on Web.
Does Keyword Tool API offer any discounts?
Keyword Tool API publicly lists the following: Save over 20% with annual billing.
Does Keyword Tool API have an Android app?
No Android app was listed when its pages were read on Oct 23, 2026. Keyword Tool API is listed for Web.
Does Keyword Tool API have an iPhone app?
No iPhone app was listed when its pages were read on Oct 23, 2026. Keyword Tool API is listed for Web.
Is Keyword Tool API open source?
Keyword Tool API is not described as open source on its own site, as read on Oct 23, 2026.
Does Keyword Tool API have an API?
Yes. Keyword Tool API offers a public API, according to its own site.
What does Keyword Tool API integrate with?
Keyword Tool API's listing names Claude, ChatGPT, Cursor and Postman. A listing names up to eight integrations, so it may connect to more.
Who makes Keyword Tool API?
Keyword Tool API is made by Essential Apps LLC and Key Tools Limited.
What are the alternatives to Keyword Tool API?
The closest alternatives to Keyword Tool API in our directory are DataForSEO, KeywordTool.io, Keywords Everywhere, Semrush and Google Keyword Planner.
How does Keyword Tool API compare with other SERP and SEO data APIs?
Keyword Tool API's GPA of 1.8 is higher than 0 of the 38 other SERP and SEO data APIs we grade.
Is Keyword Tool API good value for money?
ToolGPA grades Keyword Tool API C for value for money. Its paid plans start at $68 a month, against a middle price of $29.49 for the category: 21 of the 25 others that charge start lower.
Could I make my own version of Keyword Tool API?
To replace Keyword Tool API you would be making search volumes for millions of keywords, gathered and kept up to date.
Where this guide comes from
The prices, plans, platforms and features were read from Keyword Tool API’s own pages on Oct 23, 2026, and the grades were given on Oct 23, 2026. Graded from this listing, whose facts were read from Keyword Tool's own pages on 23 October 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Essential Apps LLC and Key Tools Limited. Prices change, so check keywordtool.io before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Keyword Tool API, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/keyword-tool-api
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Keyword Tool API: The Insider's Guide", checked Oct 23, 2026. https://toolgpa.com/tools/keyword-tool-api
Know someone choosing between SERP and SEO data APIs?
Send them this guide: toolgpa.com/tools/keyword-tool-api/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded SERP and SEO data APIs after Keyword Tool API, each with an Insider's Guide of its own.
- SERP & SEO Data APIs Insider's GuideEvery one of the 39 SERP and SEO data APIs we grade, compared
- Apify Insider's GuideScraping platform with a store of ready-made Actors, Google included2.8 GPA
- DataForSEO Insider's GuidePay-as-you-go APIs for SERP, keyword, backlink and AI mention data2.8 GPA
- Decodo SERP Scraping API Insider's GuideSERP scraping for Google, Bing and more, inside a web data API2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Keyword Tool API’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Keyword Tool API is a trademark of its owner, and this guide is not made, paid for or approved by Essential Apps LLC and Key Tools Limited. Prices and plans change: check keywordtool.io before you buy.