Relevanssi Premium is the solution for search, which will make your users say "Wow"! Why do you need it? Here is why:
With good search, your website will become better and more professional. Your users will be happier. Happy users spend more time on your website. The information you provide will be used often. The ads that you show, will score more hits. View full list of Relevanssi features. Relevanssi payment is processed by FastSpring system. Payment details are protected by FastSpring, a company-participant of the system PCI. For all operations FastSpring employs Verisign SSL certificates that meet the highest standards of Internet security transactions.
Requirements and compatibility:
In General, Relevanssi works, if you are running WordPress. View query log requires MySQL version 5. Some themes may not support the functionality Relevanssi 100%. Some plugins can conflict with Relevanssi. To use some features of Relevanssi requires knowledge of PHP and WordPress templates.
Warning: Relevanssi was not designed and is not optimized for large WP sites. If your website has 50,000-100,000 posts for indexing, Relevanssi is likely to run slowly and will give you errors and blank pages. Relevanssi created for small sites.