Blockcore Notes stores public and personal notes on decentralized infrastructure using Nostr.
Open source
24 alternativesCoolr
Join ephemeral group chats on Nostr with Coolr, an open-source service that organizes public channels by hashtag.
About Coolr
Coolr is an ephemeral group chat built on Nostr. Users can join or create public channels organized by hashtags, including Bitchat geohash channels, and connect with a Nostr browser extension or anonymously.
All messages are temporary and visible only while connected. Logging in with a Nostr key requires a browser extension such as Alby or Nos2x, and a /help command lists available commands.
Key features
- Join or create public channels using hashtags
- Connect with a Nostr extension or anonymously
- Messages are temporary and visible only while connected
- Supports Bitchat geohash channels without bc_ prefix
- Use /help to list available commands
Best for: People who want temporary, hashtag-based public group chats on Nostr.
Good for
- Offers anonymous access alongside Nostr extension login
- Organizes public channels by hashtag
- Supports Bitchat geohash channels
Watch out for
- Messages are temporary and only visible while connected
- Nostr key login requires installing an extension such as Alby or Nos2x
Coolr at a glance
- Website
- coolr.chat
- Category
- Social & Communities › Nostr
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Browser extension, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Coolr FAQ
How do I join or create channels?
Join or create public channels using hashtags, for example #21m.
Are messages saved?
No. All messages are ephemeral and you only see messages if you are connected.
What do I need to log in with my Nostr key?
Install a Nostr browser extension like Alby or Nos2x.
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