SEO Intelligence,
Without the Noise.
Analyze websites, technical SEO, keywords, backlinks and SERPs with a fast, developer-focused toolkit. Zero cookies, zero subscriptions.
Run Instant Technical Website Audit
DevFlow fetches your public URL in real time to inspect DOM headers, canonical tags, and indexability rules.
SEO Diagnostic Modules
Select a developer tool module to inspect HTML DOM structure, verify sitemap indexability, trace redirect chains, or measure search rankings.
Keyword Research Tool
Generate keyword suggestions with search volume, CPC, difficulty, and trends.
Keyword Density Checker
Analyze webpage content or raw text to measure keyword frequency, density, and readability.
Top Search Queries
Find high-traffic search queries and keywords by topic or competitor domain.
Meta Tag Checker
Extract, analyze, and preview meta tags, Open Graph tags, and Twitter Cards from any URL.
Sitemap Checker
Locate and validate XML sitemaps and view robots.txt files for any website.
Index Checker
Perform bulk checks to see if URLs are indexed in Google and Bing search engines.
Crawlability Checker
Test if search engine spiders can access, crawl, and render a webpage.
SEO Links Checker & Link Analyzer
Free SEO links checker to scan web pages, check quality of backlinks, inspect internal/external link equity, and verify HTTP status codes.
Domain Authority Checker
Calculate DevFlow Authority Score, spam scores, and referring domains for multiple domains.
Page Authority Checker
Verify page-level authority scores, title tags, and meta tag status for URLs.
External Backlink Checker
Free external backlink checker to analyze backlinks, check quality of backlinks, inspect anchor text, dofollow/nofollow equity, and replace legacy PHP backlink checker scripts.
Top Referrers Checker
Identify top referral traffic sources and domains backlinking to a site.
Competitor SEO Checker
Audit a competitor's website for keywords, backlinks, page speed, and index coverage.
Google SERP Checker & SERP Tester
Free Google SERP checker and live SEO SERP tester. Analyze top 100 search engine rankings, domain positions, and organic SERP features instantly.
Bing SERP Checker
Analyze search rankings for keyword queries in simulated Bing Search Results.
Redirect Chain Tracer
Trace redirect paths (301/302) to verify final canonical URL statuses.
WHOIS & DNS Inspector
Retrieve domain WHOIS registrar info and check DNS server records (NS, MX, TXT, A).
CSS Selector Scraper
Parse a webpage's HTML structure and extract content using custom CSS selectors.
Website SEO Audit
Run a comprehensive automated SEO audit to get actionable improvement suggestions.
Schema Markup Generator
Generate structured JSON-LD schema markup for Google Rich Snippets.
XML Sitemap Builder
Crawl domains up to 30 pages to dynamically generate optimized sitemap files.
Robots.txt Checker & Builder
Create standard robots.txt files and validate crawler directives against URLs.
Keyword Gap Analyzer
Compare two domains side-by-side to identify missing keyword opportunities.
HOW IT WORKS
Simple 3-step technical SEO inspection workflow.
ENTER URL
Provide any target website URL or keyword string into the console.
RUN ANALYSIS
DevFlow crawlers inspect live HTML tags, robots rules, canonical headers, and response latency.
FIX ISSUES
Review prioritized critical issues and export structured CSV/PDF reports.
DEVFLOW CLI
Trigger diagnostic scans directly inside local terminal sessions or automated CI/CD build scripts.
BEFORE VS AFTER OPTIMIZATION
Inspect how resolving technical SEO errors directly improves indexing health.
❌ 12 Critical HTML Tag Errors
⚠️ 18 Warning Directives
Missing Canonical Tags & Broken Sitemap
✓ 2 Remaining Minor Notices
✓ Valid Canonical & Sitemap XML
Fully Indexed & Crawlable Status
FREQUENTLY ASKED QUESTIONS
Clear technical documentation on DevFlow diagnostics.
What is DevFlow SEO Tool?+
DevFlow is a developer-first search engine diagnostics suite featuring a free Google SERP checker, external backlink checker, and SEO links checker to audit HTML tags, test crawlability, and check quality of backlinks in real time.
How do I test search engine rankings with the Google SERP Checker?+
Our free Google SERP checker and SEO SERP tester allows you to analyze domain positions, keyword difficulty, and organic search snippets across top SERP results instantly.
Can DevFlow replace a legacy PHP backlink checker script?+
Yes! DevFlow's external backlink checker replaces self-hosted PHP backlink checker scripts by performing real-time HTTP link parsing to check SEO links, evaluate dofollow/nofollow attributes, and check quality of backlinks automatically.
Is DevFlow SEO Tool 100% free?+
Yes. All 23 diagnostic tools (including SERP checker, SEO links checker, and backlink quality tools), CLI utilities, and API endpoints are 100% free with zero subscription fees or required logins.
How does DevFlow analyze webpage authority?+
DevFlow calculates a transparent 'DevFlow Authority Score' based on live HTTP ping latency, SSL validation, DNS records, and domain link structure.