Loading comparison
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.
Screpy
Covers keyword research, SERP analysis, organic keywords, competitor ads, backlinks, referring domains, and Search Console, but depth and quotas vary by plan.
Read the full reviews: Screpy and WebPageTest.
Feature directory lists Keyword Research, SERP Analysis, Organic Keywords, Competitor Ads, Backlink Checker, Referring Domains, and Search Console: https://screpy.com/features/
WebPageTest
Deep page-performance diagnosis, but no keyword, SERP, competitor, backlink, or market research workflow.
WebPageTest diagnoses DNS, TCP, TLS, loading, rendering, and Core Web Vitals for tested pages. https://www.webpagetest.org/
Keyword research quality for SEO content
Discovery
How well the tool identifies, qualifies, clusters, and prioritizes keywords specifically for SEO content creation.
Screpy
Provides ideas, intent, volume, CPC, trends, and content-brief linkage; official detail is positive but not evidence of breadth comparable to specialist databases.
Screpy says Keyword Research finds ideas, reviews intent, and connects demand with pages, articles, and campaigns: https://screpy.com/feature/keyword-research/
WebPageTest
No keyword discovery or keyword-volume workflow is documented.
The official product pages describe performance tests, Core Web Vitals, and diagnostics, but provide no keyword-research feature. https://www.webpagetest.org/
Content execution
Execution
How well the tool helps produce, optimize, or operationalize SEO content.
Screpy
Generates queued article outlines/first drafts and Markdown for review, but does not claim autonomous publishing or optimization execution.
AI Article Generator creates drafts from titles/briefs and requires review before publishing: https://screpy.com/feature/ai-article-generator/
WebPageTest
No content briefing, generation, or optimization workflow is documented.
The pricing feature list covers testing, Lighthouse, Opportunities, scripts, API, and Experiments, not content execution. https://www.webpagetest.org/signup
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.
Screpy
Uses crawled pages, Search Console data, ranking context, and project-level website data to prioritize opportunities.
Quick Wins is described as turning crawl and Search Console data into prioritized technical, content, and ranking opportunities: https://screpy.com/features/
WebPageTest
Grounded in detailed page-load, browser, network, device, and CrUX data, not business or broad SEO context.
Users configure browser, region, device, and connection for performance tests and can compare lab and field metrics. https://www.webpagetest.org/webvitals
AI-search / GEO
Visibility
How directly the tool helps teams improve visibility in AI answer engines and citation-oriented search journeys.
Screpy
Tracks AI mentions, citations, sources, prompts, and competitor share of voice across monitored AI answers.
AI Visibility feature explicitly lists mentions, citations, sources, prompts, and competitor share of voice: https://screpy.com/feature/ai-visibility/
WebPageTest
No generative-engine optimization feature is documented.
The official pages mention SEO rankings via Core Web Vitals but do not claim generative-search visibility, citation tracking, or AI-search optimization. https://www.webpagetest.org/
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.
Screpy
Has AI visibility monitoring and an SEO MCP, but official pages do not establish broad autonomous optimization for generative search.
AI Visibility monitors AI answers and SEO MCP exposes workflows to assistants: https://screpy.com/feature/ai-visibility/ and https://screpy.com/feature/seo-mcp/
WebPageTest
No GEO capability in the generative-optimization sense.
The location capabilities are for performance testing geography, not generative-engine optimization. https://www.webpagetest.org/webvitals
Technical SEO
Diagnostics
How strong the tool is for crawling, audits, indexability, metadata, status codes, and technical site health.
Screpy
Strong explicit technical suite spanning audits, crawling, status/redirects/canonicals, broken links, image SEO, Core Web Vitals, PageSpeed, uptime, and index status.
Official feature directory documents the technical modules and their functions: https://screpy.com/features/
WebPageTest
Very strong Core Web Vitals and page-performance diagnostics.
The homepage explicitly connects WebPageTest to Core Web Vitals and SEO rankings; Tips also lists CrUX, Lighthouse, in-depth metrics, waterfalls, and API/integrations. https://www.webpagetest.org/tips.php
Publishing workflow
Operations
How well the tool moves work into CMS, publishing, approvals, or automated production workflows.
Screpy
Supports reviewed Markdown draft output, but no official native CMS publishing workflow is documented.
The article feature says users review Markdown output before publishing: https://screpy.com/feature/ai-article-generator/
WebPageTest
No CMS, editorial calendar, or publishing integration is documented.
The documented integrations are performance-testing/CI workflows rather than publishing workflows. https://www.webpagetest.org/tips.php
Measurement & tracking
Measurement
How well the tool monitors rankings, content performance, visibility, or ongoing SEO progress.
Screpy
Offers rank, map, AI visibility, Core Web Vitals, PageSpeed, uptime, Search Console, analytics, and reports over time.
Monitoring and reporting modules are listed with trend/monitoring functions: https://screpy.com/features/
WebPageTest
Strong measurement, history, comparisons, and monitoring options.
Starter includes 60 days of history and Professional 13 months, while Professional adds scheduled tests, alerts, dashboards, and monitoring-oriented features. https://www.webpagetest.org/signup
Team collaboration
Operations
How well the tool fits multi-person workflows, agencies, approvals, handoffs, and repeatable processes.
Screpy
Project workspace, team seats, client/white-label reports, and scheduled delivery support team workflows; no detailed review/approval system is claimed.
Pricing lists team-member quotas and Reports included; Project Workspace and White-label SEO Reports are official features: https://screpy.com/pricing/ and https://screpy.com/features/
WebPageTest
Team seats, Slack results, and pull-request comments support engineering handoffs, without a broad SEO approval workflow.
WebPageTest documents Pro team members, Slack result sharing, and GitHub pull-request comments. https://www.webpagetest.org/tips.php
Value accessibility
Buying
How easy it is for a team to reach value relative to pricing, setup complexity, and required expertise.
Screpy
Transparent low displayed entry price, free trial, and three clear tiers make access relatively straightforward, though key modules are gated.
Pricing shows Pro $6/month, Max $15/month, Ultra $30/month and a 7-day trial: https://screpy.com/pricing/
WebPageTest
The core speed test is free and can run without an account.
The web-vitals page says users can run a free website speed test with no account, and Starter is listed at $0. https://www.webpagetest.org/webvitals
Free tools
Buying
How useful the tool is before payment through free tools, free plans, trials, or public utilities.
Screpy
The official site provides several free standalone SEO tools, but they are separate tools and do not imply full platform access.
Screpy lists Website Analyzer, Google Rank Checker, SEO Report Generator, SERP Competitor Research, and Robots.txt Tester under Free SEO Tools: https://screpy.com/
WebPageTest
Free tier includes substantial analysis rather than only a teaser.
Starter includes 150 monthly runs, Lighthouse, Opportunities, Filmstrip and Video, custom scripts, 30 locations, and Carbon Control. https://www.webpagetest.org/signup
Estimated customer scale
Market proof
Estimated customer or user scale based on public claims, with source claims stored separately for auditability.
Screpy
Official site displays ten named trust logos, but provides no customer count or independently verifiable scale metric.
The homepage trust section names Uber, Philips, FedEx Express, Bosch, Champion, Iconfinder, T-Mobile, Carrefour, Stanley, and Skoda: https://screpy.com/
WebPageTest
No numeric first-party customer count was found.
The homepage says it is trusted by top brands and shows logos, but does not state a numeric customer count. https://www.webpagetest.org/
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.
Screpy
SEO MCP, REST API, AI-assistant integrations, and n8n provide meaningful agent connectivity, but the official material does not demonstrate broad end-to-end agent autonomy.
Screpy documents SEO MCP/API and integrations with ChatGPT, Claude, Perplexity, Gemini, Cursor, GitHub Copilot, and n8n: https://screpy.com/feature/seo-mcp/ and https://screpy.com/integrations/
WebPageTest
APIs, scripting, custom metrics, and CI automation make tests programmable, but no dedicated autonomous SEO agent is documented.
WebPageTest documents API-controlled tests, scripting, GitHub automation, and a Node wrapper. https://www.webpagetest.org/tips.php
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.
Screpy
Quick Wins and AI-assisted workflows prioritize and draft work, while review and publishing control remain with users.
Quick Wins prioritizes next actions and the article generator requires review, editing, fact-checking, and publishing control: https://screpy.com/features/ and https://screpy.com/feature/ai-article-generator/
WebPageTest
Professional supports scheduled/automated testing and alerts, but not autonomous SEO decision-making.
Professional includes scheduled tests, customizable alerts, API access, and Experiments; the API material describes automation in CI/CD. https://www.webpagetest.org/signup