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https://freshrss.org is self hosted and has a webui that works across anything. It also supports Google Readers API spec so any compatible app should hook into it.
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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I self host miniflux (https://miniflux.app/). It's been working well for me.
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Another vote here for Miniflux, if you can host your own (not all that difficult to do and always the best for privacy). It's designed to be minimal, has a mobile progressive web app, syncs with many desktop/CLI clients (I use Newsboat which has native support for it), and auto-detects feeds.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.