Ahrefs vs SiteOne Crawler

Ahrefs is a web and API platform for SEO research, including keyword research, rank tracking, site audits, backlink analysis and competitor research. It also provides content tools, AI assistants and MCP access. Content Explorer can find web mentions and link prospects, while AI Content Helper supports content improvement. The free plan provides site data and fixes with limited access to Site Explorer and Site Audit. Paid plans start with Starter at $29 a month. Lite costs $129 a month and includes five projects, 750 tracked keywords, 100,000 monthly crawl credits and one user; its Site Audit allowance has a 25,000-page project maximum. Annual payment saves up to 17%. Enterprise costs $1,499 a month and requires an annual commitment; it includes SSO, two-factor authentication, ISO27001 certification, access management, audit logs and unlimited additional users. Ahrefs says its web index contains 170 trillion pages, tracks 41.9 billion keywords and filters 28.7 billion keywords; AhrefsBot crawls 8 billion pages daily. Founded in 2010, the company is headquartered in Singapore. Multilingual support is available five days a week.

SiteOne Crawler is a free website crawler and audit tool that examines SEO, performance, accessibility, security, best practices, and content. It produces an interactive HTML report or text and JSON output, and assigns a quality score from 0.0 to 10.0 across five areas: performance, SEO, security, accessibility, and best practices. It can save a static copy of a website for offline browsing, turn a whole site into Markdown, and generate llms.txt. An optional Chromium mode renders JavaScript-driven pages before crawling. The native Rust binary runs on Windows, macOS, and Linux, with desktop and command-line variants; it has no runtime dependencies. API access and self-hosting are also listed. A CI/CD quality gate offers configurable thresholds, JUnit XML, GitHub annotations, and exit code 10 when checks fail. Reports can be shared through a free service using secure URLs with optional expiration and password protection. The default crawl uses three workers and no more than 10 requests per second combined. Plans are listed at free.