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Omnivore vs Cauldron: catalog facts
Omnivore	Cauldron
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the Apache-2.0 licence; requires an Instapaper account.
Web, Self-hosted, Browser extension	Linux
Highlights, notes and labels on saved articles Newsletters by email, PDFs and RSS feeds in one place	Native GTK interface for GNOME Reads saved Instapaper articles outside the browser
Hosted service closed, so you must run your own server Maintained by the community after the company stepped back	Only works with Instapaper Linux only
Self-hosted	Downloadable app
Open source	Open source
License: AGPL-3.0	License: Apache-2.0
Not stated if an account is needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.