Yes, both WordPress and Customer.io offer a Free Trial.
WordPress is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Customer.io is designed for Large Enterprises, Medium Business and Small Business.
Pricing for WordPress Starts at $4/Month when Billed Yearly whereas for Customer.io Starts at $100/Month.
Some top alternatives to WordPress includes Unbounce, VWO Deploy, SITE123, Wix, Squarespace, Webflow, Builder, WebsiteBuilder, Format, WeWeb, Shopify, Drupal, Concrete5, WebBoss and Web.com.
Some top alternatives to Customer.io includes Outgrow, ActiveCampaign, CleverTap, Moosend, Omnisend, ActiveTrail, Iterable, Hubspot Marketing Hub, Klaviyo, SendGrid, MailChimp, StreamSend, Adobe Marketo Engage and Contactspot.