Alternative to Freestyle app on Apple for libre2?

Hola :). I am planning on spending a few weeks on my feet soon-ish, as soon as the borders and hostels/hotels reopen in Europe (late October, probably, walking into December/January).

My Libre spits out crap numbers, lately. Depending on sensor, I am up to 20mg/dl too high or too low. Right now, despite having had a finger berry reading of 80, it's screaming at me about being at 60, trajectory falling. This is obviously not good enough.

The overall readings are pretty stable (albeit always x mg/dl too high or low), though, and I presume that, if I could calibrate it, it would get pretty accurate. When using MiaoMiao and Tomato or Spike, I get that, but MiaoMiao is not a good idea when walking 30+ km every day, it tends to fall off (experience) and is generally very uncomfortable to wear.

Under Android, I'd just have installed xDrip and be done, but this is an Apple device. Are there any alternative apps able to read libre2 sensor data and having calibration?