Alternatives to Hypothesis

Highlights and annotates any web page or PDF, privately or in a group. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Hypothesis.

  • Liner

    Browser extension for highlighting, bookmarking and AI-summarizing webpages.

    FreemiumProprietaryBrowser extension

    Liner combines highlighting with bookmarking and AI summaries across pages, PDFs and videos, but is closed source, freemium and lacks group annotation layers.

  • WebScrapBook

    Captures web pages into an organised, annotatable local archive.

    FreeOpen sourceBrowser extension

    WebScrapBook stores highlights and annotations locally with captured pages instead of on a hosted service, but full features need a companion backend server.

Also worth comparing

These listings name Hypothesis as their own alternative, so the relationship runs both ways.

  • Diigo

    A web annotation and bookmarking service with a browser extension for highlighting, tagging and saving pages.

    FreemiumProprietaryWebBrowser extension

    Hypothesis is open source under BSD-2-Clause and free, with private, group and public annotation layers, but it offers no tagged bookmark library or outliner.

  • Glasp

    A browser extension and mobile app for highlighting text on web pages and PDFs and collecting notes.

    FreeProprietaryAndroidiOSBrowser extension

    Hypothesis is open source under BSD-2-Clause, anchors annotations to text on pages and PDFs, and supports private and group layers, but has no mobile apps listed.

Similar software

Related functionality, not a direct replacement.