Fenrir-s provides a Kotlin implementation of a Nostr relay, with its source code hosted on GitHub.
Open source
24 alternativesbloom
bloom combines a self-hosted media server with a Nostr relay for decentralized media sharing.
About bloom
Bloom is a self-hosted application that combines a Blossom protocol media server with a Nostr relay in one package. It stores files on the user's own desktop or phone and implements BUD-00 through BUD-10, with blob storage and retrieval, mirroring from remote servers, NIP-94 metadata, and blossom:// URI support.
It runs on Android, iOS, Linux, macOS, and Windows, with background operation through system tray presence on desktop and foreground services or background tasks on mobile. iOS builds are currently unsigned, and the macOS build may require a quarantine-removal command to open.
Key features
- Upload, download, and manage files with SHA-256 content addressing
- Pull and verify blobs from remote Blossom servers
- Built-in Nostr relay runs alongside media server
- File metadata tags for Nostr event integration (NIP-94)
- Parse and resolve native blossom:// URI scheme
- Background sync via system tray and mobile background services
Best for: People who want to keep Blossom media files on their own devices while running a personal Nostr relay.
Good for
- Implements BUD-00 through BUD-10 for Blossom compatibility
- Stores files on the user's machine without third-party hosting
- Open-source code under GPL-3.0 license
Watch out for
- iOS builds are currently unsigned and should be used at own risk
- macOS build may be flagged as damaged and require a terminal command to open
bloom at a glance
- Website
- github.com/nostrnative/bloom
- Category
- Social & Communities › Nostr
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, iOS, Linux, macOS, Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
bloom alternatives
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bloom FAQ
Which operating systems does Bloom support?
Desktop on macOS, Windows, and Linux, and mobile on Android and iOS from a single codebase.
What should I do if the macOS app will not open?
If macOS reports it as damaged or from an unidentified developer, run: sudo xattr -rd com.apple.quarantine /Applications/Bloom.app
Is the iOS build signed?
No. The source states iOS builds are currently not signed because a developer account is not yet available, and they should be used at own risk.
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