1
Also covers open source · same kind of open-source project
Blossom specifies HTTP endpoints for storing blobs on media servers using Nostr public and private keys for identity.
Alternatives
The Best contact cloud Alternatives in 2026
24 alternatives0 free · 24 open source
Looking for something like contact cloud? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 24 are open source.
About contact cloudgithub.com/canostrical/contact_cloud
VisitContact Cloud visualizes a Nostr contact-list graph, with the project exploring proximity between public keys.
Top picks at a glance
First suggestionBlossomBlossom specifies HTTP endpoints for storing blobs on media…Another optionbraybray provides a trust-aware Nostr MCP server with…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Blossom | — | Yes | — |
| 2 | bray | — | Yes | — |
| 3 | Aegis | — | Yes | Android, iOS, Linux |
| 4 | Denostr | — | Yes | — |
| 5 | Blockcore Notes | — | Yes | Browser extension |
| 6 | Blossom Drive | — | Yes | — |
| 7 | better-auth-nostr | — | Yes | Browser extension |
| 8 | cfrelay | — | Yes | — |
| 9 | algia-web | — | Yes | — |
| 10 | amberflutter | — | Yes | — |
All contact cloud alternatives
2
Also covers open source · same kind of open-source project
bray provides a trust-aware Nostr MCP server with verification, proximity, and access controls.
3
Also covers open source · same kind of open-source project
Aegis signs Nostr events through a simple cross-platform signer, allowing clients to request signing without handling private keys directly.
4
Also covers open source · same kind of open-source project
Denostr implements a Rust-based, cloud-native Nostr relay derived from nostr-rs-relay.
5
Also covers open source · same kind of open-source project
Blockcore Notes stores public and personal notes on decentralized infrastructure using Nostr.
6
Also covers open source · same kind of open-source project
Blossom Drive was an experimental cloud drive built on Blossom servers; its project page says it is no longer active.
7
Also covers open source · same kind of open-source project
better-auth-nostr adds NIP-98 Nostr authentication to Better Auth through a plugin for login flows.
8
Also covers open source · same kind of open-source project
cfrelay runs a Nostr relay on Cloudflare Workers and supports the basic NIP-01 protocol.
9
Also covers open source · same kind of open-source project
algia-web renders Nostr pages through server-side rendering backed by the algia command line tool.
10
Also covers open source · same kind of open-source project
amberflutter wraps the Amber Nostr signer in Flutter, enabling Android apps to connect to the signing service.
11
Also covers open source · same kind of open-source project
Dart NDK provides a Dart development kit with high-level use cases for building Nostr applications.
12
Also covers open source · same kind of open-source project
arduino-nostr connects Arduino projects to the Nostr protocol, with the repository describing Nostr as an open communication protocol.
13
Also covers open source · same kind of open-source project
This repository publishes a feature matrix showing protocol capabilities supported by Nostr clients.
14
Also covers open source · same kind of open-source project
This comparison list tracks which Nostr clients support different protocol features and NIPs.
15
Also covers open source · same kind of open-source project
dart-nostr provides a Flutter library for implementing the Nostr protocol in Dart.
16
Also covers open source · same kind of open-source project
Evento provides an open-source Nostr client with a built-in self-custodial Bitcoin Lightning wallet.
17
Also covers open source · same kind of open-source project
Bitcredit event traffic is handled by bcr-relay, a specialized Nostr relay implementation written in Rust.
18
Also covers open source · same kind of open-source project
broadcastr transmits Nostr events from one relay to other relays as a stateless alternative to blastr.
19
Also covers open source · same kind of open-source project
blastr publishes Nostr events to multiple relays through a proxy relay running on Cloudflare Workers.
20
Also covers open source · same kind of open-source project
connect4 supports multiplayer Connect Four over Nostr and can be hosted by players themselves.
21
Also covers open source · same kind of open-source project
Coop provides cross-platform Nostr messaging with a client for chatting privately.
22
Also covers open source · same kind of open-source project
The cln-nip47 plugin connects Core Lightning wallets through Nostr Wallet Connect as specified in NIP-47.
23
Also covers open source · same kind of open-source project
ehagaki provides a post-only Nostr client that compresses media on the device before upload.
24
Also covers open source · same kind of open-source project
Citrine runs a Nostr relay on Android that lets compatible clients send and receive events through the device.
No alternatives match this filter.
Alternatives to similar tools
better-auth-nostr24 alternativesBlossom Drive24 alternativesBlockcore Notes24 alternativesdart NDK24 alternativesarduino-nostr24 alternativescfrelay24 alternatives
What is the best alternative to contact cloud?
Based on features, tags and platforms, the closest alternatives to contact cloud are Blossom, bray, and Aegis.
Are there open-source alternatives to contact cloud?
Yes: Blossom, bray, Aegis, and Denostr.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative