Alternatives to PaperSpan

Matter

Matter suits readers who want to collect different kinds of content in one searchable library and read offline.

Instapaper

Instapaper suits readers who want to save web content for offline reading and organize it across devices.

Cubox

Cubox suits readers who want to save, search, annotate, and revisit material across devices and browsers.

Gistory suits knowledge workers, researchers, students, and curious readers who want to save articles and review summaries instead of reading every item in full.

Omnivore suits readers who want to collect and organize articles and documents, then read them across devices.

Burn 451

It is aimed at people who prefer to triage unread links rather than keep a permanent bookmark archive.

Couch

Couch suits Apple-device users who want to save, organize, search, and read content offline.

It suits readers who want offline access to saved web content across desktop and mobile platforms.

Readspace suits people who want news, analysis, and writing from chosen publications, blogs, and writers in one place.

It suits people who save links and ideas and want them resurfaced at a chosen time.

Freezetab suits people who want to save and search links, articles, feeds, and quotes across a local extension or connected devices.

Burkmak suits self-hosters, Kobo readers, and note-takers who want saved articles and highlights available in Obsidian.

Linkpack suits people collecting links across browser extensions, iOS, and Dropbox.