Summaries are done for a single article. I think it's better this way — a summary is a clear reflection of an underlying article, where all statements can be easily tracked to a single original source. That makes LLM hallucinations extremely rare.

No plans for an iOS app, but my site is a PWA so can be installed and look like an app both on Android and iOS.

I kinda like the approach of Boring Report, where it does combine multiple sources into one summary. Still, I like your https://newsletter.newsminimalist.com/archive page. What about using other models instead of GPT-4o mini, like Claude 3 Haiku, Llama 3.1, or Mixtral (which now started a partnership with AFP https://news.ycombinator.com/item?id=42732960).