1Zpresso JX or the JX Pro. Incredibly well built and really hard to beat the price/performance ratio.
These two models are overall very similar (same burrs I think), but the pro has an easier adjustment and very fine tuned adjustment. If you can swing for the pro it's worth it. It's capable of everything from french press to pour over to espresso. The non-pro you would probably struggle with fine tuning espresso but it's certainly still a great grinder for other uses.
This is hilarious to say considering reddit:
a) has had an api to support 3rd party apps since the beginning
b) went more than a decade before making a 1st party app
c) the 1st party app is literally based on a 3rd party app they bought out