IdeaCheck.io is described as 'Test your startup-idea within your target group. Scientifically validated and monitored'. There are four alternatives to IdeaCheck.io, not only websites but also apps for . The best alternative is ValidBee, which is free. Other great sites and apps similar to IdeaCheck.io are UsersThink (Paid), GetFeedback by Draftss (Freemium) and upNable (Paid).