The verdict
For a small B2B team with a website to improve, I'd pick Convert Experiences. It does not assume you sell products, the plans are public and you can start a trial without a card.
If you run an online shop and want to build a testing habit without paying at first, I'd pick Omniconvert. The Explore product has a free tier up to a set number of tested users each month, and the surveys and overlays are useful for quick wins.
If your testing is mostly server-side in a software product, check what the SDKs cover in either tool before you buy.