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Iris vs Nostur: catalog facts
Iris	Nostur
Free The research shows no pricing for using the web client.	Free Available from the App Store or as a direct download, with published source.
Web	macOS, iOS
Runs in the browser with nothing to install Relay list you can edit, with discovered relays	Multiple accounts and a guest mode Posts stored on device with export
Content and reach depend on the relays you connect to Nostr has a smaller audience than mainstream networks	Apple platforms only Zaps require a Lightning wallet
Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it 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 September 24, 2026

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