Is there a trial for Conjointly software?

Yes, you are welcome to sign up for free. You can run small studies with fewer than 20 responses without charge. If you want to launch your study without paying for licence, you can untick the payment boxes:

Conjointly software trial

Generally, experiments with 20 respondents or fewer are useful for testing the tool, but typically cannot provide reliable results. If you want to test with ~50 survey testers, you can use the Quick Feedback functionality without licence. Larger studies attract fees.