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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 Relixir.
Google documents keyword ideas, search frequency, trend, and campaign-forecast data for Google Ads. https://ads.google.com/home/tools/keyword-planner/
Relixir
Strong research capability for high-intent GEO opportunities, but the page does not expose methodology or deliverables in detail.
The page explicitly lists a deep research engine, competitor and keyword gap analysis, social-media insight mining, and large-scale web research: https://www.relixir.ai/rex
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/
Relixir
Rex researches GEO topics and opportunities, but the official page does not establish a conventional keyword volume and difficulty database.
The official Rex page describes autonomous GEO research and execution: https://www.relixir.ai/rex
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/
Relixir
End-to-end automated content generation, publishing, and recurring refreshes are explicitly described.
The page describes GEO content generation, autonomous publishing, JSON-LD/semantic structure, citations, and 30–60 day CMS refresh cycles: https://www.relixir.ai/rex
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/
Relixir
The product claims broad competitor, keyword, social, web, marketing-stack, and LLM context gathering.
The page lists competitor and keyword gaps, social insights, large-scale web research, stack connections, and LLM response extraction: https://www.relixir.ai/rex
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/
Relixir
AI-search/GEO is the core product positioning across major LLMs and Google AI Overviews.
Rex is positioned to improve recommendations and citations across Google AI Overviews, ChatGPT, Perplexity, and Claude: https://www.relixir.ai/rex
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/
Relixir
High GEO readiness through monitoring, citation optimization, structured content, and authority workflows.
The page lists citation optimization, AI retrieval structures, citation tracking, domain-authority scoring, and strategic link building: https://www.relixir.ai/rex
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/
Relixir
Technical SEO is supported through audits and site-health actions, though implementation depth is unspecified.
Rex is said to crawl sites, fix broken links, optimize meta tags, improve Core Web Vitals, and monitor site health: https://www.relixir.ai/rex
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/
Relixir
Autonomous publishing and CMS refresh workflows are explicitly part of deployment.
The page says Rex publishes GEO-optimized content 24/7 and refreshes CMS content on 30–60 day cycles: https://www.relixir.ai/rex
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/
Relixir
Rich AI-search measurement is described, including visibility, citations, competitors, traffic, and leads; exact attribution setup is not stated.
The AI Search Analytics Dashboard lists mention rate, citation rate, competitor share of voice, AI traffic, and AI-sourced leads: https://www.relixir.ai/rex
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/
Relixir
Weak evidence only: Slack is listed as an integration and Relixir provides ongoing support; collaborative workflows are not detailed.
The page lists Slack among one-click integrations and dedicated onboarding/ongoing support, but no roles, comments, or approval workflow: https://www.relixir.ai/rex
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/
Relixir
A managed custom deployment may suit funded B2B teams, but public affordability cannot be assessed.
The only published plan is Custom Pricing with a demo CTA; no public lower-cost tier is shown: https://www.relixir.ai/rex
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/
Relixir
No free plan, free tool, or free trial is documented on the supplied product page.
The pricing section shows only Custom Pricing and Book a Demo, with no free access offer: https://www.relixir.ai/rex
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/
Relixir
The page provides a meaningful but self-reported adoption signal; no independently verifiable customer total is supplied.
Relixir states Rex is trusted by 400+ fastest-growing B2B teams and references 1,200 production GEO workflows: https://www.relixir.ai/rex
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/
Relixir
Rex is explicitly marketed as an autonomous employee running expert GEO workflows 24/7.
The page says Rex runs autonomously, works 24/7, optimizes experimentation, learns from publishing/ranking signals, and refines evaluation criteria: https://www.relixir.ai/rex
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/
Relixir
The onboarding promise is unusually low-friction: connect the stack, define goals, and let Rex run without configuration.
The page says no setup steps or configuration are needed and describes connect, define goals, and autonomous execution: https://www.relixir.ai/rex