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Tool comparison
Both tools graded on the same fifteen criteria. The verdict lists the criteria where one tool leads the other by two points or more.
Verdict
Verdict
Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
Google Ads Keyword Planner
Useful search-demand and idea research inside an advertising workflow, without broader SEO research coverage.
Read the full reviews: Google Ads Keyword Planner and Semrush.
Google documents keyword ideas, search frequency, trend, and campaign-forecast data for Google Ads. https://ads.google.com/home/tools/keyword-planner/
Semrush
Deep keyword, competitor, backlink, and domain research workflows are explicitly documented.
SEO Toolkit lists competitor research, Keyword Gap, Keyword Overview, Keyword Magic Tool, backlinks, and related reports: https://www.semrush.com/kb/806-seo-toolkit
Keyword research quality for SEO content
Discovery
How well the tool identifies, qualifies, clusters, and prioritizes keywords specifically for SEO content creation.
Google Ads Keyword Planner
Provides real keyword ideas and demand data, but prioritizes paid-search campaigns rather than SEO content planning.
The official page frames its ideas, forecasts, suggested bids, and budgets around creating Search campaigns. https://ads.google.com/home/tools/keyword-planner/
Semrush
Keyword research is a core workflow with a large proprietary database and multiple dedicated tools.
Semrush cites its keyword database and lists Keyword Overview, Keyword Magic Tool, and Keyword Strategy Builder: https://www.semrush.com/kb/806-seo-toolkit
Content execution
Execution
How well the tool helps produce, optimize, or operationalize SEO content.
Google Ads Keyword Planner
No content writing, optimization, briefing, or publishing feature is described.
The official feature description is about advertiser keyword lists, bids, plans, and campaigns; it does not describe content execution. https://ads.google.com/home/tools/keyword-planner/
Semrush
Content optimization is included in Pro+ and the platform documents briefs and draft scoring, but publishing is not core SEO-plan execution.
Pro+ includes content optimization; Semrush describes briefs and draft scoring: https://www.semrush.com/pricing/seo-ai-search/; https://www.semrush.com/kb/995-what-is-semrush
Context gathering
Grounding
How well the tool gathers the business, competitor, SEO, internal, third-party, and custom API context needed for differentiated recommendations and content.
Google Ads Keyword Planner
Accepts product/service terms or a website as discovery inputs, but has no evidence of internal business-context ingestion.
The page says users can enter keywords related to products or services or enter a website to search for related content. https://ads.google.com/home/tools/keyword-planner/
Semrush
Competitor domains, traffic sources, top pages, keyword gaps, and backlink context are supported.
The official feature list describes domain strategy, traffic sources, top pages, keyword gaps, and backlinks: https://www.semrush.com/kb/995-what-is-semrush
AI-search / GEO
Visibility
How directly the tool helps teams improve visibility in AI answer engines and citation-oriented search journeys.
Google Ads Keyword Planner
No AI-search or generative-engine optimization capability is described.
The official page describes Google Ads keyword research and forecasts and contains no AI-search, generative-answer, or GEO workflow claim. https://ads.google.com/home/tools/keyword-planner/
Semrush
Current plans track AI prompts, AI brand performance, sentiment, and visibility across major AI systems.
Pricing lists AI-search tracking and AI Visibility limits; the product page names ChatGPT, Gemini, and Perplexity: https://www.semrush.com/pricing/seo-ai-search/; https://www.semrush.com/kb/995-what-is-semrush
GEO readiness
Visibility
How ready the tool is for generative engine optimization: answer-engine visibility, citation likelihood, AI-search prompt surfaces, and content structures that AI systems can use.
Google Ads Keyword Planner
No generative-engine optimization readiness or visibility measurement is described.
The page's outputs are keyword ideas, trends, bids, plans, and ad forecasts, not generative-search visibility. https://ads.google.com/home/tools/keyword-planner/
Semrush
Multi-location and device tracking is explicitly available in Pro+.
Pro+ includes multi-location/device tracking: https://www.semrush.com/pricing/seo-ai-search/
Technical SEO
Diagnostics
How strong the tool is for crawling, audits, indexability, metadata, status codes, and technical site health.
Google Ads Keyword Planner
No crawling, indexing, page-health, schema, or technical SEO auditing feature is described.
The official page focuses on search-campaign keywords and advertising plans and does not describe technical SEO analysis. https://ads.google.com/home/tools/keyword-planner/
Semrush
Site Audit and on-page/technical SEO workflows are core SEO Toolkit capabilities.
The Toolkit lists Site Audit, On Page SEO Checker, and technical SEO auditing: https://www.semrush.com/kb/806-seo-toolkit
Publishing workflow
Operations
How well the tool moves work into CMS, publishing, approvals, or automated production workflows.
Google Ads Keyword Planner
It does not publish or approve SEO content.
The official workflow creates keyword plans and advertising campaigns; it does not document CMS publishing or SEO-content approval. https://ads.google.com/home/tools/keyword-planner/
Semrush
Official pages support content optimization and describe content workflows, but do not establish a full native publishing workflow for the core product.
The core pricing page only explicitly lists content optimization at Pro+; the official product description discusses content workflows without establishing core CMS publishing: https://www.semrush.com/pricing/seo-ai-search/; https://www.semrush.com/kb/995-what-is-semrush
Measurement & tracking
Measurement
How well the tool monitors rankings, content performance, visibility, or ongoing SEO progress.
Google Ads Keyword Planner
Forecasts campaign keyword performance but does not monitor organic rankings or content outcomes.
Google presents forecasted conversions, clicks, and impressions for advertising plans, not ongoing organic SEO measurement. https://ads.google.com/home/tools/keyword-planner/
Semrush
Daily keyword rank tracking, AI visibility reporting, sentiment monitoring, and SEO Share of Voice are supported.
SEO, Pro+, and Advanced plan features include Position Tracking, AI reports, sentiment, and Share of Voice: https://www.semrush.com/pricing/seo-ai-search/
Team collaboration
Operations
How well the tool fits multi-person workflows, agencies, approvals, handoffs, and repeatable processes.
Google Ads Keyword Planner
Supports sharing a keyword plan, with no broader editorial collaboration evidence.
The official page explicitly says users can save their plan or share it with others. https://ads.google.com/home/tools/keyword-planner/
Semrush
Team/agency positioning and additional-user support exist, but advanced collaboration is primarily enterprise-oriented.
Semrush describes plans for teams/agencies and additional-user pricing, while enterprise adds team governance: https://www.semrush.com/kb/1011-subscriptions
Value accessibility
Buying
How easy it is for a team to reach value relative to pricing, setup complexity, and required expertise.
Google Ads Keyword Planner
The core resource is free, though setup and account-mode prerequisites add friction.
The page calls Keyword Planner free and says access follows Google Ads account setup and campaign creation; Smart Mode requires Expert Mode. https://ads.google.com/home/tools/keyword-planner/
Semrush
A free tier and trials make evaluation accessible, but paid plans start at a high monthly price.
Free is $0 and seven-day trials are documented; SEO is $139 monthly: https://www.semrush.com/pricing/seo-ai-search/; https://www.semrush.com/kb/1011-subscriptions
Free tools
Buying
How useful the tool is before payment through free tools, free plans, trials, or public utilities.
Google Ads Keyword Planner
The product itself is explicitly presented as a free resource.
The FAQ on the official page states that Google Keyword Planner is a free resource for advertisers. https://ads.google.com/home/tools/keyword-planner/
Semrush
A limited free account exists with one demo project and daily report limits.
The official pricing page states the Free plan limits: https://www.semrush.com/pricing/seo-ai-search/
Estimated customer scale
Market proof
Estimated customer or user scale based on public claims, with source claims stored separately for auditability.
Google Ads Keyword Planner
No customer or user count is published on the supplied page.
The official page provides product features and access instructions but no numeric customer or user claim. https://ads.google.com/home/tools/keyword-planner/
Semrush
Official company materials provide meaningful adoption figures, though the clearest paying-customer figure is from 2023.
Company timeline reports 100,000 paying customers and 1,000,000 free registered active users in 2023: https://www.semrush.com/company/
Agent readiness level
Automation
How ready the product is to operate as or inside an AI agent workflow, based on tracked subcriteria for autonomy, controls, integrations, memory, and evaluation.
Google Ads Keyword Planner
No autonomous agent, API-based agent, or agent orchestration capability is described.
The official page presents guided UI actions such as Discover new keywords, saving/sharing a plan, and creating a campaign, without an agent-readiness claim. https://ads.google.com/home/tools/keyword-planner/
Semrush
MCP access and API data integration provide machine-access paths, but the evidence does not establish a broadly autonomous SEO agent.
Starter includes MCP access and Advanced includes API data integration: https://www.semrush.com/pricing/seo-ai-search/
Ease of use and autonomous level
Automation
How easy it is for a team to reach useful outcomes, and how much work the product can perform autonomously after setup.
Google Ads Keyword Planner
Guided workflows exist, but the user must operate the tool and finalize campaign actions.
The page instructs users to open Keyword Planner, search or upload keywords, add them to a plan, and implement the plan as a campaign; it does not claim autonomous execution. https://ads.google.com/home/tools/keyword-planner/
Semrush
AI-powered recommendations and AI visibility features assist workflows, but human execution remains necessary.
Semrush describes AI-powered recommendations and AI visibility features, while the SEO Toolkit presents actionable insights rather than autonomous execution: https://www.semrush.com/kb/1011-subscriptions; https://www.semrush.com/kb/806-seo-toolkit