Compare software

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

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