Squarespace offers Free Trial, but Respond.io does not.
Squarespace is designed for Medium Business and Small Business.
Respond.io is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Squarespace Starts at $12/Month when Billed Yearly whereas for Respond.io Starts at $29/Month.
Some top alternatives to Squarespace includes Unbounce, VWO Deploy, WordPress, SITE123, Wix, Webflow, Envato Sites, WebsiteBuilder, Bookmark Website Builder, Format, Website.com, SiteBuilder.com, Square Ecommerce, GoDaddy Website Builder and Web.com.
Some top alternatives to Respond.io includes ZoomInfo Chat, Intalk.io, Respond Flow, LiveAgent, UseResponse, LiveChat, Tidio Chat, HelpOnClick, Zoho SalesIQ, Smartchat and Channel.io.