Blog

Guides on bulk URL checking, SEO link audits, and keeping documentation healthy

Comparison

Sitebulb vs ContentKing vs Bulk URL Checker (2026)

May 29, 202611 min read

Audit, monitor, or both? Honest 2026 comparison of three popular tools for broken-link detection and SEO change monitoring, plus the pairings that make sense.

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Engineering

Why Your Python URL Checker Stops Working at 5,000 URLs

May 28, 202610 min read

The five reasons your httpx + asyncio URL checker stops scaling, with code, profiling, and the fixes (or the managed alternative).

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Engineering

The Hidden $500/mo Cost of Rolling Your Own Bulk URL Checker

May 28, 20269 min read

Honest math on what it actually costs to build and maintain a Python URL checker at scale: engineer time, proxy bills, monitoring, on-call.

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Engineering

Soft 404 Detection: When HTTP 200 Actually Means Broken

May 28, 20268 min read

A page returns 200 OK but says "Not Found". Why this matters for link auditing, how to detect it reliably, and the gotchas.

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Engineering

How We Built Per-Domain Rate Limiting for 75K-URL Jobs

May 28, 202611 min read

The Redis-backed scheduler that keeps a 75,000-URL job politely throttled across thousands of domains without starving any of them.

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Tutorial

Bulk URL Checking in 10 Lines of Python (Without Writing the Crawler)

May 28, 20266 min read

Install the SDK, get a key, check 50,000 URLs in your terminal. Plus patterns for CSV input, sitemap monitoring, and CI/CD.

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Tutorial

How to Check for 404 Errors on Your Website (SEO Guide)

April 11, 202610 min read

Find and fix 404 errors hurting your SEO. Step-by-step guide using Google Search Console, crawlers, and bulk URL checkers.

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Comparison

Free vs Paid Broken Link Checkers: Which Do You Need?

April 11, 20269 min read

Compare free and paid broken link checkers. When free tools are enough, when you need to upgrade, and what to look for.

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Educational

What Are HTTP Status Codes? Complete Guide for SEO

April 10, 202612 min read

Complete guide to HTTP status codes. Learn what 200, 301, 302, 404, 410, 500, and 503 mean and how they affect your search rankings.

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Tutorial

How to Find Broken Links on Any Website (2026 Guide)

April 10, 20269 min read

Free methods, browser tools, Google Search Console, and bulk checking to find and fix broken links on any website.

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Comparison

Best Bulk URL Checkers in 2026 (Free & Paid)

April 10, 202611 min read

Compare the best bulk URL checkers in 2026. Free and paid tools for checking thousands of URLs for broken links, redirects, and status codes.

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Use Case

Check Broken Links Before Website Migration: Complete Checklist

April 10, 202610 min read

Prevent SEO traffic loss during website migration. Step-by-step URL validation checklist for before, during, and after migration.

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Developer Guide

How to Validate URLs from a CSV File (3 Methods)

April 10, 20268 min read

Validate thousands of URLs from a CSV file using Python scripts, Google Sheets, or a cloud-based bulk checker. Step-by-step guide with code examples.

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Developer Guide

How to Check URLs in Bulk: Guide for Developers

April 6, 202610 min read

Python scripts, cloud-based tools, and CI/CD integration for checking thousands of URLs in documentation sites, knowledge bases, and content databases.

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Comparison

Screaming Frog Alternative: Cloud-Based URL Checker

April 6, 20268 min read

Head-to-head comparison of Screaming Frog vs Bulk URL Checker. Cloud processing, rate limit handling, and pricing differences for SEO teams.

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Use Case

Documentation Link Checker: Keep Your Docs Healthy

April 6, 202612 min read

How to find and fix broken links across API docs, Confluence, Notion, GitBook, and large knowledge bases with 10,000+ URLs.

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