CrawlGenius Log Analyzer vs Spider-Lens

CrawlGenius Log Analyzer analyzes server logs to show how search engines and AI crawlers interact with a website. Its SEO analysis identifies crawl budget waste, HTTP errors, orphan pages, redirect and canonical issues, and fake bots. AI and LLM crawlers are tracked separately from Googlebot, with comparisons between AI and SEO crawling. Dashboards cover crawl coverage, freshness, time to first visit, new URLs, and URLs crawled but never clicked.

Logs can be supplied through a WordPress plugin, server agent, file upload, Amazon S3, or FTP/sFTP deposit; FTP/sFTP is unavailable on the Free plan. Paid plans include a REST API and MCP server. The pricing page says AI crawlers are checked against more than 3,500 official IP ranges and spoofed hits rejected at ingestion. The company says data is hosted in the EU, processed under GDPR, and visitor IPs are truncated before storage; it does not currently hold SOC 2 or ISO 27001 certification. The web-based product is aimed at SEO professionals. The Free plan is free and covers 10,000 log lines monthly, one project, and a seven-day visible window. Starter is €49 a month and Agency is €149 a month, excluding VAT. A guided 30-day trial uses real customer logs and requires no credit card or commitment.

Spider-Lens is a free, open-source application for analyzing Apache and Nginx server logs. It monitors traffic, HTTP errors, crawler bots and server performance through a dashboard covering requests, human visits, error rates, HTTP status trends, bot distribution and 12-week patterns. Crawler monitoring detects 16 or more bots and shows crawl budget and crawler volume. Performance reports include Time to First Byte by URL, configurable slow thresholds and CSV or Excel export. A sitemap crawler follows internal links and records titles, H1 headings, word counts, canonicals, robots directives and crawl depth. SMTP alerts and webhooks can report 404 spikes, server errors, missing Googlebot and weekly summaries. The project documents Discord, Slack and an MCP server integration. It runs as a Node.js application or native WordPress plugin, with no Node.js required for the plugin. Node deployment requires Node.js 18+, npm 9+ and log access. The interface lists 16 languages and automatic browser-language detection. Nova uses Gemini when configured.