When comparing rendora vs SEO4Ajax, the Slant community recommends rendora for most people. In the question“What are the best services for making JavaScript SPA SEO friendly?” rendora is ranked 1st while SEO4Ajax is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Made in Golang
Pro Prometheus metrics
Pro Self hosted
Pro No change needed in both backend and frontend
Pro FOSS
it's free and open source
Pro Based on Chrome
If your site is compatible with Chrome, SEO4Ajax can handle it. No need to test your site with PhantomJS.
Pro SEO reports
The SEO reports allow identifying technical SEO issues such as broken links, duplicate contents/titles and pages with low word count.
Pro Embedded dashboard
The dashboard gives some insight about bot activity on the site.
Pro Embedded rewrite rule engine
The rewrite rule engine helps to transform URLs (e.g. removing query parameters) or return custom HTTP code (e.g. 301, 302, 404 etc.) when needed.
Pro Embedded crawler
The crawler helps discover all the contents on the site without providing a sitemap.
Pro Free plan for sites with 1000 unique URLs
Pro Full JSON API
Pro Easy to use
Provides an intuitive and complete interface.