I love Feedbin and it's open source. Been using it for a while now and as a big RSS user I think it does a great job.
>When Google got out of the RSS game, those of us who remained realized that yes, we can survive without them. Five years later, RSS is still the best, most unfiltered way to get content you want. There’s a greater diversity of choices and no one company dominates everything. So let’s stop hoping Facebook or Twitter or someone else will do our job for us. Let’s stop waiting for someone to tell us what we want to read. Let’s stop publishing what they want us to publish. We can do better without them.
Personally I use Feedbin :)
https://feedbin.com/blog/2018/01/11/feedbin-is-the-best-way-to-read-twitter/
I'm happy with what Feedbin does. I've also used RSS Bridge with Tiny Tiny RSS.
This is that thing.
Many of the good RSS apps on Android are tied to a service. Feedly, Inoreader, etc. Many of the apps that could be used with independent services just die on Android.
If you want to not pay (which is a legitimate thing... no hate here) you can self-host an RSS service, but even then, you need an app, or a service with a web interface that won't break your phone.
I use Feedbin. I don't mind paying. I'd rather not mess around, and I want to use RSS on multiple devices and operating systems. It's simple UI and powerful filters get it done for me, even when I'm on Android.
https://feedbin.com/apps?filter=android
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iOS tends to be a bigger UI playground.
I think feedbin had a public discussion about their implementation of an image proxy... and I believe source code is available. Maybe a review of the specifics would indicate their expectation.
I'm not aware of any services that poll as fast as 1min.
However if the WebSub works for instant updates there are a number available. I run FeedMail which is email-based. You should be able to enable email notifications for these messages on iOS if desired. I also know that Feedbin and BazQux Reader support WebSub but I don't know about their iOS apps.
I don't know about Discord, but RSS Bridge works for me. It's self-hosted, but I used the implementation on ttrss.info with TinyTinyRSS.
I also am a Feedbin subscriber, and I find their Twitter Integration to be great:
https://feedbin.com/blog/2018/01/11/feedbin-is-the-best-way-to-read-twitter/
I found links in your comment that were not hyperlinked:
I did the honors for you.
^delete ^| ^information ^| ^<3
BazQux Reader and Feedbin both have no limit on unread articles age. But both have limits on total articles per feed (500 in BazQux Reader and at least 500 in Feedbin)
I fumbled with this as well. I use Feedbin.com for my feeds, and eventually discovered their mobile website is the perfect interface! It's fast, light, and customizeable. I can't believe it took me so long to think of trying it...
but some feeders are already implemented a while ago
https://feedbin.com/blog/2016/02/03/subscribe-to-email-newsletters-in-feedbin/
http://blog.newsblur.com/post/146752875548/newsletters-in-your-newsblur
That whole push-notification browser tab system you're describing? That's basically RSS feeds and I still use them to follow a bunch of sites: https://en.wikipedia.org/wiki/RSS
It's a shame the best free RSS syndication site Google Reader shut down but there are still a few free/cheap options on the market.
A great (paid) service I now use for this is https://feedbin.com/ - highly recommend it!
Personally, after Google Reader left everyone flailing to find a comparable service, I opted for Fever running on a server of mine. For me, this has two advantages over other hosted service:
Running a server is not for everyone, so its understandable why my route is the exception rather than the rule. I did use Feedbin for a short bit during the transition and it worked just fine.
I've tried them all and feedbin works best for me. It's just like google reader if google had continued to put engineering resources into it. It costs a couple bucks a month but Google taught me to be skeptical of free software.