There is a severe distinction between true meditation and app-based guided “meditation”.
If you are wanting to practice true meditation then you require only your breath and time.
If you are seeking more of a mental motivation type experience, then the app stuff will fill that niche.
A couple of years ago I did a lot of reading about brain function etc. and naturally caught a whiff of mediation and its studied effects. I started using Insight just for the timing bells, but found it to be too social media-ish (e.g. rewards, friends, etc.) so I dropped it.
I was doing 3x10min mediation intervals/day but had read it takes the brain ~20min to really adapt to new stimulus so I thought I would start doing 3x20min intervals. Then, because I’m me, I decided to do a 10x experiment. For 30 days I meditated for 300min/day – 3x90min intervals (I know, that’s only 270min but close enough!). No fluffy guided stuff or anything, just sitting and focusing on the breath. Weird sh!t happened. Think Fear & Loathing in Las Vegas but w/o all the drugs.
Week 1 was rough! Your mind does not want to meditate! Week 2 things started to click. Weeks 3-4 were, and I use the term embarrassingly, enlightening. A very marked increase in calmness and focus.
I no longer mediate that much, mostly because I’m spending too much time on the trainer trying to kill myself. The habits and “skills” are still ingrained and I can utilize them somewhat in daily life but I have a hard time pulling them into intense workouts; although focus on the breath and counting are effective.
Good luck which ever direction you choose.