summaryfeed runs in your browser, so there is nothing to download from an app store. Install it once and saving a link becomes a single tap from any app. Native iOS and Android apps are on the roadmap — but this works today.
On iPhone or iPad, add summaryfeed to your Home Screen in Safari, then create a Shortcut so it appears in the Share sheet. On Android, install it from your browser and it shows up in the native Share menu automatically. On any device, append a page URL to https://summaryfeed.app/#add?url= to save it instantly.