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i have a Crux my daughter got me. No app for it. But i did download the annova and joule apps for cooking suggestions. It works well for me. Inkbird is a sponsor here and lots of the guys use their SV. And You can occasionally find a discount code for them.
Jim
I have an Anova Precision, which I use most of the time, and an Anova Pro that I use if I want to use a large cooler for my water bath.
I use the Doug Baldwin instructions and tables as well as the Anova site instead of an app. Once I found my sweet spot for certain things, I just recorded that info into a SV journal.
If you want to try it fairly inexpensively to see if its some thing you want to do, the Monoprice Strata can be had for $50 with free shipping. With that thought in mind I bought one 6 yrs ago just to see if I liked it. Shortly after, Anova closed out their 900 watt line and I picked one of those up for $28 on clearance. I was going to switch over to it but decided to use the Strata until the wheels fell off which I thought would happen in a year or two. A couple weeks ago it finally gave up the ghost in the middle of a cook and I made the switch to the Anova. I was surprised and impressed that it lasted that long as much as it was used. No bells and whistles but it works.
Bigtank
based on wanting the app Id go with this one https://amzn.to/3TpqB9D but that being said I also have the Inkbird one and do not use the app but it works great.