Nostter

Damus is iOS-native and Iris is a feature-rich web client; Nostter sits in between as a clean PWA optimized for desktop power users. Nostter's UI is more compact and information-dense, it has better keyboard navigation, and it surfaces advanced Nostr concepts (NIP support, relay routing, event kinds) more explicitly. Damus wins on iOS polish; Iris wins on feature breadth (chats, communities, video); Nostter wins on minimal UX and desktop ergonomics. Heavy Nostr users often run multiple clients in parallel and switch based on context.

Yes — Nostter is open-source under MIT and free to use, with no paid tier. The Nostr protocol itself is free and uses public relay infrastructure (free or paid relays your client connects to). Some relays charge small subscription fees for paid tiers (typically $1-$5/month) to combat spam, but you can post freely to many free public relays. Zapping (sending Lightning tips) requires a Lightning wallet but no Nostr-specific subscription.

Both are decentralized social protocols, but the architectures differ. Bluesky uses AT Protocol with personal data servers (PDSes) and a centralized indexing layer (the AppView). Nostr uses cryptographic keys and a network of relays — no global indexer, weaker discovery, but stronger censorship resistance. Bluesky's UX is more polished and approachable; Nostr's network is more resilient and ideologically pure. Crypto-aligned users prefer Nostr; mainstream users prefer Bluesky. Nostter is the client; the network underneath is the protocol-level difference.

Nostter is installable as a PWA and caches the app shell for fast loading. Reading previously-loaded notes works offline; posting, fetching new notes, or zapping requires a live connection to at least one Nostr relay. The protocol design assumes connectivity to multiple relays simultaneously; offline-first usage is not a core scenario. For long offline periods, the protocol-level eventual consistency works: when you reconnect, your client publishes queued events to all configured relays.

Nostter's audience overlaps with the Bitcoin and cypherpunk communities, journalists in censored regions, and tech-aligned Mastodon users who also keep a Nostr identity. Public figures including Jack Dorsey and Edward Snowden have posted on Nostr (using various clients including Damus, Iris, and Nostter). Total Nostr active users sit in the low hundreds of thousands as of 2026, with Nostter representing a small but loyal slice optimized for desktop power users.