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Not FOSS but free - ReadEra, it’s working extremely well. No ads or anything, the only feature the paid version has is cloud sync of your library, and sync reading progress across devices.
Been using it for 8 years or so, bought it at some point just because it works without a hitch since basically forever.
Just sign up for their API and use chatboxai.app (free software), use the GPT4 API code, and you’ll use the model through an alternative front-end for pennies on the dollar.
I’m using it extensively and rarely spend more than 1,20 - 1,50 a month.