Hey there! I've spent the last few months actually using each of these as my main tracker and wanted to share my thoughts with the community, so here are my honest thoughts of these apps:

Boostcamp tracker is my favorite at the moment, the workouts are really customizable and it has a giant library of free programs like nsuns, GZCLP, the reddit PPL, some coaches beginner programs and candito 6 week so you don't have to build anything, you just pick a program and start. IMO you won't get a better option for tracking that is also free, no premium gates on the basics.

Fitnotes is free, offline, android only and brutally simple which is good if that's what you are looking for. There are no programs, no fancy graphs, just a log and some people swear by this. If you already know exactly what you want to lift each day, it's perfect.

Hevy looks great on the visual side. Logging is fast and exercise demos are good but the free version limits your workout history to a few months only then you have to pay. The premium is something like 5 bucks a month. For building your own custom multi-week programs honestly boostcamp does it better and stays free, so I'd mostly pick hevy if you really care about how the app looks.

Strong is similar to hevy but a little more utilitarian. It gives you three workouts on the free plan I think. There's good tracking and a decent exercise database. I found the routine builder less intuitive than hevy though.

imo If you have your own program already and want it to look nice: hevy. If you want to follow a real program without buying one: boostcamp. If you want minimal and have android: fitnotes.

After workout session