With thanks to @glasgow for noticing these were out (and raising a bug report because you can’t see them in the app), Monzo and Starling are now part of the regular customer satisfaction survey run by the major banks:
https://www.ipsos.com/ipsos-mori/en-uk/personal-banking-service-quality-great-britain-august-2020
Some really interesting data to delve into, but:
- Monzo top overall, with Starling second. First Direct rounds out the top three.
- Monzo best app, with Starling second
- Starling best overdraft (unsurprisingly) with Monzo fourth (a bit higher than I thought they might be, actually).