Market positioning
These two tools exist for different reasons, and it's worth saying so plainly. HubSpot Website Grader is a lead magnet: a free, fast, well-made grader that gives any website a score out of 100 across performance, SEO, mobile, and security, and then points you toward HubSpot's ecosystem — Academy courses, CMS, and marketing tools. It is not trying to be a professional audit platform, and judged as what it is, it's excellent: instant, free, and readable by anyone. SlapMyWeb is a standalone audit SaaS. The free scan is the product's entry point too, but the product underneath is a 240+ check engine with AI-written verdicts, prioritized action plans, generated fix code, and paid tiers that extend into keyword research, rank tracking, backlinks, and agency reporting. The honest comparison is therefore not "which grader is better" but "what does your situation call for": a one-minute temperature check, or a diagnostic deep enough to drive actual remediation work. Many people will reasonably start with the Grader and move to a deeper tool when the score alone stops being useful.