Best Log File Analysis Tools in 2025

Log file analysis is one of the most underused techniques in technical SEO. Your server logs tell you exactly which pages search engine bots crawl, how often they visit, which responses they get, and where they waste their crawl budget. This data is impossible to get from Google Search Console or any crawling tool because it shows actual bot behavior, not simulated crawls.

The challenge is that raw server logs are massive, messy, and difficult to parse without dedicated software. A single month of logs for a mid-sized site can be millions of lines. The tools in this roundup turn that raw data into actionable SEO insights: crawl frequency maps, bot behavior trends, orphan page detection, and crawl budget optimization recommendations.

Screaming Frog Log Analyzer

Screaming Frog is best known for its desktop crawler, but the Log File Analyser is a separate product that handles server log analysis. It imports log files from Apache, Nginx, IIS, and other server formats, then visualizes bot activity with charts and filterable tables. You can cross-reference log data with crawl data from the SEO Spider to find pages that bots visit but your crawl misses (and vice versa).

The tool runs locally on your machine, which means your log data never leaves your computer. The Log File Analyser is a standalone product separate from the SEO Spider, and it has its own licence. The free download caps you at 1,000 log events, and a paid licence removes that limit at £99 per year (around $139 or €129), billed per user, with bulk discounts that drop the per-seat price to £69 at 20 or more licences. Licences last one year and need renewing after that.

Pros: Works offline with local data, excellent cross-referencing with SEO Spider crawl data, handles large log files efficiently, one-time annual cost. Cons: Desktop-only (no cloud dashboards or team sharing), requires manual log file exports, no real-time monitoring, learning curve for the interface.

Botify

Botify is an enterprise-grade SEO platform where log file analysis is one module within a larger suite. Their LogAnalyzer product connects directly to your server or CDN to ingest logs automatically, eliminating the need to manually export files. It maps crawl behavior across your entire site architecture and correlates it with rankings, impressions, and revenue data.

Botify publishes no list pricing, and every contract is negotiated directly with its sales team on annual terms. Third-party estimates put mid-sized deployments in the $75,000 to $150,000 per year range, with large enterprise deals exceeding $400,000 per year, priced on URLs crawled, log volume analyzed, and the modules you enable. It is used by brands like Expedia, Crate & Barrel, and T-Mobile.

Pros: Automated log ingestion (no manual exports), correlates crawl data with business metrics, scales to billions of pages, dedicated customer success team. Cons: Enterprise pricing puts it out of reach for most small teams, complex platform with a steep learning curve, requires onboarding period.

JetOctopus

JetOctopus is a cloud-based technical SEO platform that has gained a strong reputation for log analysis at a more accessible price point than Botify. Their Logs Explorer tool processes log files quickly and provides visualizations of bot crawl patterns, status code distributions, crawl frequency by URL type, and crawl waste analysis.

Pricing is steeper than it once was. The entry plan runs €383 per month when billed annually and includes 1 million crawl pages (or 500K JavaScript crawl pages), 1 million log lines, one Google Search Console property, and one Google Analytics property. A larger tier scales up to 5 million crawl pages and 3 million log lines. There are no per-user fees, so the whole team can use one subscription, and a 7-day paid free trial gives full module access with crawling capped at 10K URLs. JetOctopus also includes a website crawler and GSC integration.

Pros: Cloud-based with sharable dashboards, fast processing of large log files, competitive pricing for the feature set, good visualizations. Cons: Requires uploading log files (no direct server connection on lower plans), the interface can feel cluttered with data, some advanced filters take time to learn.

Lumar (formerly Deepcrawl)

Lumar rebranded from Deepcrawl and expanded beyond crawling into a full technical SEO intelligence platform. Their log file analysis module integrates with their crawler to give you a unified view of how search engines interact with your site versus how a crawler sees it. Lumar focuses on enterprise clients and offers automated monitoring with alerts.

Pricing is custom with no public fixed tiers, gated behind a quote request form, and built on a usage-based URL credit model where heavier settings consume more credits (for example, storing HTML or screenshots adds 0.1 credit per URL, and enabling site speed adds 1 credit per URL). Third-party listings peg the entry point at roughly $300 per month, though real costs depend on credit volume. Lumar is used by companies like Microsoft, Adobe, and Nestle.

Pros: Unified crawl and log analysis in one platform, automated monitoring and alerting, enterprise-grade reliability, strong API for custom integrations. Cons: Expensive for smaller sites, the platform has a lot of features that can overwhelm new users, requires sales call for pricing.

Oncrawl

Oncrawl is a technical SEO platform built around data science. Their log analyzer ingests server logs and combines them with crawl data, ranking data, and even custom data sources through their data pipeline. The standout feature is their segmentation engine, which lets you analyze bot behavior by custom URL groups, page types, or any dimension you define.

Pricing starts at €49 per month for the Explorer plan, which covers crawling up to 100,000 URLs per month across one project with unlimited users and unlimited exports. The Business plan at €199 per month raises that to 500,000 URLs per month across two projects, and an Infinite and Beyond tier handles enterprise crawl volumes with JavaScript crawling, custom data sources, and VIP support on a custom quote. Oncrawl was acquired by Botify in 2022 but continues to operate as a separate product.

Pros: Powerful data segmentation, combines multiple data sources into unified analysis, good for data-driven SEO teams, flexible API. Cons: The data science approach has a learning curve, now owned by Botify which raises questions about long-term product independence, can be slow processing very large datasets.

SEOlyzer

SEOlyzer takes a different approach from the others. Instead of importing log files after the fact, it works as a real-time log analysis tool. You install a small script on your server (or configure your CDN to forward logs), and SEOlyzer processes bot visits as they happen. You get a live dashboard showing which bots are crawling which pages right now.

The tool offers a genuinely free tier covering one site with the crawler, logs, and up to 5,000 URLs analyzed per month. Paid plans start at €39 per month for Lite, which lifts the limit to 100,000 URLs on one site with the crawler (plus JavaScript), logs, cross analysis, and one GSC connection. Advanced is €69 per month for three sites and up to 200,000 URLs, and Premium is €249 per month for five sites and up to 1,000,000 URLs, with a custom Enterprise tier above that. Setup uses connectors for PHP, Apache, Nginx, and Varnish, or log forwarding from Cloudflare, Amazon S3, Akamai, OVH, or secure FTP. SEOlyzer is popular among technical SEOs who want real-time crawl monitoring without the enterprise price tag.

Pros: Real-time bot monitoring, easy setup with server script, affordable pricing, free tier available, intuitive dashboard. Cons: Requires server-side installation (not everyone has access), fewer analysis features than enterprise tools, smaller company with less support infrastructure, limited cross-referencing capabilities.

Comparison Table

By the Numbers (2026)

Current pricing and limits, pulled from each vendor and checked on 2026-05-29. Currency conversions are approximate and the foreign-exchange rate moves, so treat the non-native figures as a guide.

• Screaming Frog Log File Analyser: Free up to 1,000 log events. Paid licence £99 per year (about $139 or €129), per user, one-year term. Bulk pricing falls to £89 (5 to 9 seats), £79 (10 to 19), and £69 (20 or more). Source
• JetOctopus: Entry plan €383 per month billed annually, covering 1 million crawl pages (or 500K JavaScript pages), 1 million log lines, one GSC property, and one GA property. No per-user fees. A higher tier reaches 5 million crawl pages and 3 million log lines. 7-day paid trial with crawling capped at 10K URLs. Source
• Oncrawl: Explorer €49 per month (100,000 URLs per month, one project), Business €199 per month (500,000 URLs per month, two projects), and a custom Infinite and Beyond tier. Unlimited users and exports on the paid plans. Source
• SEOlyzer: Free for one site and 5,000 URLs per month. Lite €39 per month (100,000 URLs, one site, crawler plus JavaScript, logs, cross analysis, one GSC connect), Advanced €69 per month (three sites, 200,000 URLs), Premium €249 per month (five sites, 1,000,000 URLs), plus custom Enterprise. Source
• Botify: No public list pricing. Third-party estimates place mid-sized annual deployments at roughly $75,000 to $150,000 per year, with large enterprise contracts above $400,000 per year, all custom quotes. Check current pricing with their sales team. Source
• Lumar (formerly Deepcrawl): Custom quote only, with no fixed public tiers, on a usage-based URL credit model. Third-party listings estimate an entry point near $300 per month. Check current pricing via their quote form. Source

Verdict

Best for solo practitioners: Screaming Frog Log Analyzer if you already have the SEO Spider license. You get log analysis bundled in and your data stays local.

Best value for teams: JetOctopus strikes the best balance between price and features. The cloud-based dashboards make it easy to share findings with developers and stakeholders.

Best for real-time monitoring: SEOlyzer is the clear winner if you want to watch bot behavior as it happens without enterprise pricing.

Best for enterprise: Botify or Lumar depending on your existing tech stack. Both handle massive sites with automated ingestion and enterprise support.

Best for data teams: Oncrawl's segmentation engine and data pipeline make it the strongest choice if your SEO team thinks in terms of custom dimensions and data analysis.

Start with understanding what you actually need. If you have never done log file analysis before, Screaming Frog or SEOlyzer's free tier will teach you the fundamentals. Graduate to JetOctopus or Oncrawl when you need cloud collaboration. Move to Botify or Lumar when your site outgrows everything else.

Sources

All pricing and limits below were checked on 2026-05-29.

• Screaming Frog Log File Analyser pricing
• JetOctopus subscriptions and pricing
• Oncrawl pricing tiers (OMR Reviews)
• Oncrawl official site
• SEOlyzer log analysis and pricing
• SEOlyzer pricing breakdown (Craig Campbell SEO)
• Botify pricing estimates (That Marketing Buddy)
• Lumar pricing