The best alternatives to Fuse (Pre-launch) are Inspr, TsterApp, and Reky. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Fuse (Pre-launch)?
.Tech Domains — Building a tech startup? Build it on a .tech domain. On the house for Product Hunt makers
Reky is an open-source API development platform which automatically visualizes API response with outstanding graphs and help you figure data structure in it out swiftly. https://reky.org/
NapAnt's mission is to help developers achieve their full potential by visualizing key development figures and automating the work reporting process. NapAnt creates an environment where you can focus on your creative work.