@Nikkinoodle84 yep, believe it is. I was using Ovia before I bought an Ava, and when I look back at that calendar I realise my partner and I were a bit out timing wise.
The first month I used Ava I didn't believe it when it said my period was due as Ovia said another date and I'd been using it for a while - but Ava was right!
This month I've been putting the temperature data from the Ava bracelet into Ovia, Fertility Friend and Kindara (i thought it was worth cross checking things).
Ovia seems to be a couple of days out from Ava.
Fertility Friend is pretty much in line. Also while this app has a more dated appearance, I like the amount of data that can be recorded and also displayed on the chart in one go.
Kindara predictions don't seem to be altered by the temps, also I don't like the limited data input.
Going by other cycle signs (ewcm, sore boobs in literal phase) I'd say that Ava is accurate.