Sucuri SiteCheck is a free remote scanner that checks for malware, blacklist status, and known vulnerabilities on demand. StoreVitals is a continuous ecommerce health platform — it includes blacklist and security header checks, but treats them as part of an ongoing weekly audit rather than a one-shot scan.
These tools complement each other rather than compete. Sucuri SiteCheck is the right answer for 'is my store actively infected with malware?' — it has the deepest signature database in the industry. StoreVitals answers 'is my store healthy across all dimensions, week after week?' — it includes blacklist and header checks but doesn't do deep malware analysis. Most ecommerce stores should use both: Sucuri (or the full Sucuri platform with WAF) for active malware defense, StoreVitals for weekly health monitoring. If you're choosing one and you've never been hacked, start with StoreVitals; if you've been hacked or run on outdated WordPress, start with Sucuri.