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Cauldron vs Readwise Reader: catalog facts
Cauldron	Readwise Reader
Free Free and open source under the Apache-2.0 licence; requires an Instapaper account.	Paid Paid subscription.
Linux	Windows, macOS, Android, iOS, Web, Browser extension
Native GTK interface for GNOME Reads saved Instapaper articles outside the browser	Handles many content types in one inbox, not just web articles Deep highlighting and search tools for power readers
Only works with Instapaper Linux only	Paid subscription required Most valuable when paired with the separate Readwise highlights product
Downloadable app	Downloadable app, Web application, Browser extension
Open source	Closed source
License: Apache-2.0	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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