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Google Keyword Planner, Ahrefs Keyword Generator, Ahrefs Free and Semrush’s free-tool collection cover different parts of a no-subscription workflow. Use Keyword Planner for Google search and advertising estimates, Ahrefs Keyword Generator for ideas across several search engines, Ahrefs Free for data from verified websites, and Semrush when you want several standalone utilities. None is objectively best for every blog; choose according to the data, setup and limits you need.
Which free keyword tool fits your situation?
| Tool | Best fit | What it provides | Access conditions and limits |
|---|---|---|---|
| Google Keyword Planner | Google-focused topic research and advertising context | Related keywords, monthly-search estimates, average ad-cost estimates and keyword organization | Google says basic features such as “Get ideas for new keywords” require completed Google Ads setup with billing information. Figures are campaign estimates, not organic ranking forecasts. |
| Ahrefs Keyword Generator | Generating ideas beyond Google | Keyword ideas for Google, Bing, YouTube and Amazon; vendor-described filters for difficulty, CPC, SERP features and word count; parent-topic groupings | Public generator. The page does not establish that every result is complete or equally accurate. |
| Ahrefs Free | Auditing and analyzing a site you own | SEO metrics for verified websites | Ahrefs currently lists unlimited verified websites, 5,000 Site Audit crawl credits per verified project per month, and up to 1,000 backlinks and 1,000 keywords visible at once. These are vendor-published limits and can change. |
| Semrush free tools | A collection of separate keyword and rank utilities | Keyword Tool, Keyword Search Volume Checker, Keyword Rank Checker and Keyword Checker, among other listed tools | Semrush says its listed free tools do not require sign-up, while directing users who want all marketing data to a free account. Confirm current limits in each tool. |
Google Keyword Planner: search estimates with an Ads-account requirement
Google describes Keyword Planner as a way to discover keywords related to a business and view estimates of searches and costs to target them. Its listed benefits include keyword discovery, monthly search estimates, average ad cost and organization of keyword ideas. Google summarizes the product this way: “Keyword Planner can provide insights into keyword targeting, and offer traffic estimates of keyword campaigns.” Google Ads Help
For a WordPress publisher, the important qualification is that these numbers are designed for Search campaigns. They are estimates for planning paid campaigns, not a promise that a post will receive that many organic visits or rank for the term. Google notes that campaign performance also depends on bid, budget, ad quality, location targeting and customer behavior.
What you need to access idea generation
Google says basic functions such as Get ideas for new keywords require a completed Google Ads account setup, including billing information. Do not plan a workflow around unrestricted access before that setup is complete.
#1 Best Overall
When it is the right choice
- You want Google-specific search-volume and advertising-cost context.
- You are comparing related terms for one topic and need a consistent planning source.
- You can complete the account setup and understand that the output is not an organic traffic forecast.
Ahrefs Keyword Generator: ideas across multiple search engines
The public Ahrefs Keyword Generator is aimed at discovery. Ahrefs describes keyword research across Google, Bing, YouTube and Amazon, with filters for keyword difficulty, CPC, SERP features and word count. Its parent-topic groupings can help you explore related long-tail wording rather than treating every phrase as a separate subject.
These are features described by Ahrefs; the page alone does not prove that its database is complete or that its difficulty and volume signals are more accurate than another provider’s. Use the results to build and prioritize a shortlist, then inspect the actual search results and your audience’s needs before assigning a post.
Use it when your brief is still broad
- Start with a seed phrase for a product, problem or audience.
- Switch search-engine context when video, marketplace or non-Google discovery matters.
- Group variations under a parent topic so one comprehensive page does not compete with several near-duplicates.
Ahrefs Free: site analysis, not the public idea generator
Ahrefs Free is a separate product. It provides SEO data and site analysis for websites you verify; it is not simply an expanded version of the public Keyword Generator.
Published free-tier capacity
- Unlimited verified websites.
- 5,000 Site Audit crawl credits per verified project per month.
- Up to 1,000 backlinks visible at once.
- Up to 1,000 keywords visible at once.
Ahrefs publishes those figures on its current product page. They are product limits rather than independent evidence that the service is the most accurate, and free-tier details may change.
Rank #3
- How search engines work: Because knowing your enemy is half the battle.
- SEO Basics: Like how to start a website and submit it to Google.
- Keyword Research: Find the most promising keywords for your business.
- SEO Content: Create content that even search engines want to binge-read.
- On-Page SEO: The most effective way to explain your pages to search engines.
Best use for an established blog
Verify the site you control, use the available keyword and backlink views to identify pages and queries worth improving, and reserve the public generator for finding new ideas. Keep the two products distinct when documenting your process or explaining access to contributors.
Semrush’s free tools: several utilities, separate access rules
Semrush’s free-tools directory lists a Keyword Tool, Keyword Search Volume Checker, Keyword Rank Checker and Keyword Checker, along with other SEO utilities. Semrush says the listed free tools are available without sign-up, but the same page points readers who want all marketing data toward a free Semrush account.
Rank #4
That wording does not establish unlimited searches or identical access for every feature. Open the specific tool you intend to use and check its current allowance before designing a recurring publishing process. Semrush is useful when you prefer a menu of focused utilities rather than one account that covers every research task.
A practical no-subscription workflow
- Start with evidence from your own site. If the blog already receives search impressions, identify queries and pages that show a plausible opportunity. This keeps new ideas connected to subjects your site has already begun to address.
- Expand the shortlist with an idea generator. Use Ahrefs Keyword Generator for multi-engine discovery, or use Keyword Planner when Google estimates and advertising-cost context are central.
- Record the source and qualification for every number. Label Keyword Planner figures as Google Ads estimates, and record the date, location and settings used. Do not present them as guaranteed organic traffic.
- Separate site analysis from idea discovery. Use Ahrefs Free only after verifying the relevant website; use the public Ahrefs generator when you need fresh keyword suggestions.
- Use Semrush for a specific check. Choose the listed volume, rank or keyword utility that matches the question, then verify its current access limit rather than assuming the directory implies unlimited use.
- Turn phrases into an editorial brief. Choose one primary query, list close variants and the reader’s task, and decide whether one page can satisfy them without creating overlapping posts.
- Review the live results before publishing. Keyword metrics are signals. Confirm that the results page contains the kind of content your article can improve on and that the topic fits your readers.
How to choose between the tools
Need new topics without a verified site?
Begin with Ahrefs Keyword Generator. It is the clearest fit for idea discovery and offers vendor-described coverage of Google, Bing, YouTube and Amazon. Add Keyword Planner if Google search estimates or ad-cost context will change your prioritization.
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Use Ahrefs Free after verification. Its published crawl, backlink and keyword-visibility caps define how much of a large site you can inspect in the free tier.
Want a set of standalone checks?
Browse Semrush’s free tools and select the utility that answers the immediate question. Check the live tool for current limits and whether that particular action asks for an account.
Need one “best” tool?
No neutral comparative study in the available evidence establishes a universal winner. Compare the job (ideas or owned-site analysis), search-engine coverage, metric type, account or verification requirement and current free cap.
Common mistakes to avoid
- Calling ad estimates organic forecasts: Keyword Planner is built for Search-campaign planning.
- Confusing Ahrefs products: the public generator and Ahrefs Free have different purposes and access models.
- Assuming “free” means unlimited: Ahrefs publishes explicit caps, and Semrush’s directory statement does not promise unlimited use.
- Ranking topics by a single number: volume, CPC, difficulty or a rank check cannot replace search-result inspection and audience fit.
- Reporting vendor limits as permanent: free features and quotas can change; verify the live product page before publication or a major workflow change.
Sources and access notes
The current product descriptions and limits come from the vendors’ linked pages: Google Ads Help, Ahrefs Keyword Generator, Ahrefs Free and Semrush free tools. Re-check those pages before relying on a quota, sign-up rule or feature label, because free offerings are subject to change.
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