LibreView is much closer than the app for me.I'd be curious to learn which figure turns out to be more accurate for people - A1c displayed in the app, or GMI in LibreView.
But the app is still useful, for the last 7 years, the app has told me I'm 8 mmol/mol below my lab result so I know what my next hba1c will be by adding 7 to 9 to the Libre app prediction.