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Cauldron vs Instapaper: catalog facts
Cauldron	Instapaper
Free Free and open source under the Apache-2.0 licence; requires an Instapaper account.	Freemium Free to start; check the site for current paid options.
Linux	Android, iOS, Web, Browser extension
Native GTK interface for GNOME Reads saved Instapaper articles outside the browser	Saves articles to read later instead of keeping tabs open Reading on iOS, Android, computer and eReaders
Only works with Instapaper Linux only	Hosted service, so your reading list lives on its servers Does not follow RSS feeds on its own
Downloadable app	Downloadable app, Web application, Hosted service, 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 23, 2026

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