

I recommend you to try and ignore looking at your weight on the scale or how your belly circumference changes or the like for the first month or so. Your weight also is a rather broad metric. A kilo of muscles is not the same as a kilo of fat.
Just focus on doing your exercises well and feeling how they will get easier/you can do more reps week by week.
Another quick thing you will notice is your pulse going down. After a stamina exercise right when you stop, take your pulse on your neck. take it for 10 seconds and multiply by six to get your hearts bpm. Then after two minutes of rest take it again.
Do this every week and you will see a difference right away as your body adjust into moving.
Also i know most people want to build up big muscles and go with high weights. For getting fit i recommend looking for muscular endurance training first. This will help burn fat as you do many reps. It will improve your general endurance and it will help build muscles in a way that protects against injuries. Think of this like warming up your muscles before you enter into training to increase your max power. Alternate these two types of training over time.
I dont think that poor UI programming for dedicated programs is an argument for browser based solutions.
I have issues with poorly programmed UIs in browser based tools all the time.