Yes, both productboard and Customer.io offer a Free Trial.
productboard is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Customer.io is designed for Large Enterprises, Medium Business and Small Business.
Pricing for productboard Starts at $20/User/Month when Billed Yearly whereas for Customer.io Starts at $100/Month.
Some top alternatives to productboard includes Aha!, Roadmunk, ProdPad, ProductPlan, Jira, Productroad, ProductFlare, Next Please, airfocus and IdeaPlan.
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.