Google Keyword Planner vs Keyword Tool API (2026): which should you pick?

Pick Google Keyword Planner if

• Fits if you're planning Google search ads and need a budget
• Works for getting volumes for a list of keywords without paying, if you have an Ads account

Look elsewhere if

• Skip it if you want SEO difficulty or a rival's rankings, as it shows neither
• Not for you if you'd rather not enter billing details just to research keywords
• Tight if your niche is tiny or in health or finance, as those keywords may return nothing
• Watch out: volumes are rounded 12-month averages, and each keyword is capped at 80 characters and 10 words
• Watch out: the Ads account must be in Expert Mode, and the screens are made for ad campaigns

Pick Keyword Tool API if

• 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

Look elsewhere if

• 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

Google Keyword Planner

• Needs a Google Ads account with billing details entered and setup complete, and accounts in Smart Mode must switch to Expert Mode.
• Built for ad planning: it shows bid estimates and ad forecasts, not organic difficulty scores or competitor rankings.
• Keywords with very low volume or in sensitive areas such as health or finance may return no results.
• Each keyword is limited to 80 characters and 10 words.

Keyword Tool API

• 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.

Google Keyword Planner

Keyword ideas from words or a site

Enter phrases about a product or service, or any website, and get a list of related keyword ideas to filter, group by theme and save to a plan.

Average monthly searches

Shows how often a keyword and its close variants are searched, averaged over 12 months by default, by location and network. Volumes are rounded and exact-match only.

Top-of-page bid ranges

Low and high bid estimates, roughly the 20th and 80th percentile of what advertisers paid for a top-of-page ad over the last 30 days.

Forecasts by budget

A saved plan forecasts clicks, impressions, cost and conversions for a chosen budget and bid strategy, refreshed daily from the last 7 to 10 days of data.

Volumes for your own list

Paste or upload a CSV of keywords to get search volumes and forecasts for them, then turn the plan into a Search campaign.

Google Ads API access

Developers can request keyword ideas, historical metrics and forecasts through KeywordPlanIdeaService in the Google Ads API.

Keyword Tool API

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.

Google Keyword Planner

• Free$0

  Keyword ideas, monthly search volumes, top-of-page bid ranges and forecasts, for anyone with a Google Ads account.

Keyword Tool API

• 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 & CustomCustom

  Higher daily request and keyword limits, custom API and MCP usage, procurement paperwork and bank-transfer payment, after a demo.

Google Keyword Planner

No public discounts listed.

Keyword Tool API

• 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.