Cordn App / Cordn App is on Nostr

Private messaging you own. MLS-encrypted, Nostr-native, open source.
Get the app: https://zapstore.dev/apps/org.cordn.app

Last Notes

2026-08-29 14:19:34 UTC

The coordinator is in the phone!
What if the server hosting your private group chats was just… your phone? We just made it possible. Install the Cordn Coordinator app, press Start, and even an old Android phone lying on your desk becomes the heart of your groups. No VPS, no 20-step tutorial, just an APK.
This is sovereignty no other messaging service offers. With Cordn, the entire delivery coordinator runs on a device you own: no company that can shut you down, no server you don't control. If you rely on someone else's infrastructure, you are not sovereign.
It's the same open-source Rust coordinator (cordn-rs), packaged as an Android app:
🔌 One button. It runs as a foreground service in its own process. Close the app, ignore the phone, your groups keep being served.
https://blossom.jumble.social/55ee73de332b5226e185ecda87b6cc2559239f23d541b11c4a65bf4e2b059296.png
🔐 Infra you own. The Nostr identity is generated on-device, its private key sealed in the Android Keystore, the data in app-private storage.
🔗 Easy to share. Show the QR or the cordn.net link, and your friends' Cordn clients add your coordinator in one scan.
♻ An old phone is perfect hardware: screen, battery, wifi. Give it a second life as the most private comms server in your house.
Free and open source (MIT):
📲 Zapstore: https://zapstore.dev/apps/org.cordn.coordinator
💻 GitHub: https://github.com/Cordn-msg/cordn-rs (signed APKs on Releases)
Set it up in under a minute and host your own corner of Cordn.
Like the project? Contribute any way you can: report a bug, share feedback, send some sats. We're building this together in the open 💛

2026-08-18 17:55:39 UTC

🎤🔥 New Cordn update: voice notes 🔥🎤
Sometimes you'd rather talk than type. Now you can: hold the mic button to record a voice note, release to send. Drag up to record hands-free, drag left to cancel. Voice notes play right in the conversation with a seekable waveform and timer, and like everything in Cordn, they're end-to-end encrypted and private.
Already available in Zapstore and obtanium.
That's the headline of 0.3.0, but there's more:
🎨 A full UI/UX refresh across the whole chat app: a calmer chat home with clear tiles for starting a chat, checking notifications, and settings, a simple most-recent-first sidebar, and plain words throughout (Config is now Settings, welcomes are invitations). Pull-to-refresh on the chat list, too.
🔗 Portable group links: the new cordn1 format packs the coordinator and relay hints right into the link, so an invite opens correctly no matter which Cordn client or setup receives it, and pasting one into a chat opens the group in-app.
⚡ Creating a group with several people is much faster: everyone is added in a single batch instead of one invite round per person.
📷 On native Android: take photos and record videos straight from the composer, a back button that behaves like you'd expect, edge-to-edge screens, a keyboard that never covers the composer, and fixes for the crash after a phone restart and when saving backups.
🐛 Under the hood: messages from a linked device no longer fail to decrypt, chat connections recover steadier and quieter, zombie key packages are gone from your settings, and other bug fixes.
🎁 The free @cordn.net names are still going out. Want one? Ask in the comments and we'll point it at your pubkey.
The full release notes live at https://cordn.net/chat/news
Aren't you using Cordn yet? Just start chatting at https://cordn.net/
If you like the project and want to see it grow, please consider contributing in any way you can. Every bit counts, report a bug, contribute with your expertise, send some sats. We are building this together in the open 💛

2026-08-15 18:02:42 UTC

New cordn release around the cordner! Stay tunned 💪

2026-07-27 17:12:56 UTC

- reply

Yes, no need to do anything else

2026-07-27 16:42:16 UTC

🦀 The Cordn coordinator, now native in Rust.
It's here: `cordn-rs`, the `cordn` MLS delivery coordinator you know, ported to Rust. Same protocol, same behavior, but dramatically faster and lighter.
The numbers say it all (measured head-to-head with the TypeScript original):
- 💤 ~35× less memory at idle — and still ~5× less under a full load.
- ⚡ Snappier responses, no spikes when it gets busy.
- 📦 One ~10 MB binary. Just drop it in.
The best part? It's a real drop-in. Your existing database opens and runs as-is. Swap the binary, keep your data, keep your clients.
Same version, same soul. `cordn-rs` moves in lockstep with `cordn`, same release, same number, no second versioning scheme to learn.
Try it in seconds:
```bash
curl -fsSL https://github.com/Cordn-msg/cordn-rs/raw/refs/heads/master/scripts/install.sh | sh
```
...or pull the Docker image:
```bash
docker run ghcr.io/cordn-msg/cordn-rs/cordn-server:latest
```
→ Repo, docs & benchmarks: https://github.com/Cordn-msg/cordn-rs
The same coordinator, lighter than ever. 🛰 This is our commitment with the project we are building, real production grade products that are easy to run anywhere.
Aren't you using Cordn yet? Just start chatting at cordn.net
If you like the project and want to see it grow, please consider contributing in any way you can. Every bit counts, report a bug, contribute with your expertise, send some sats. We are building this together in the open 💛

2026-07-26 12:41:04 UTC

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You have it https://cordn.net/p/skater , you could also use it as nip05 skater@cordn.net

2026-07-26 12:40:51 UTC

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You have it https://cordn.net/p/bitcoin_sikho , you could also use it as nip05 bitcoin_sikho@cordn.net

2026-07-24 19:11:00 UTC

This is a free giveaway. If you want a cool Cordn name 😎 just comment on this post so we can add you to our NIP-05 registry. Don’t miss the opportunity, this won’t last. #cordn #privacy #mld #building #foss
#nevent1q…040f

2026-07-24 17:33:18 UTC

- reply

Do you want one? :)

2026-07-24 17:17:53 UTC

Get it on @npub10r8…t2p8
#nevent1q…k73v

2026-07-24 17:17:27 UTC

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cc @npub1vjk…d33q didn't tagged you well, sorry

2026-07-24 17:15:37 UTC

🔥 New Cordn update: Cordn names and friendly links 🔥
Every Cordn profile page now has a human-readable address. Instead of a long npub, you can open a profile with a NIP-05 handle, any NIP-05, from any provider, right alongside hex, npub, and nprofile as before.
For cordn.net addresses specifically, the domain is optional: so NIP-05s like besao@cordn.net , your profile link would be simply http://cordn.net/p/besao . A clean handle you can put in a bio or drop in a DM.
🎁 Side note: if you'd like a @cordn.net name of your own, we're handing them out for free during a limited period of time, just ask in the comments and we'll point it at your pubkey.
This update (0.2.4) also ships with a few more things:
📷 On native Android, the in-app camera scanner works again for scanning group and coordinator QR codes, along with saving and sharing files, copying to the clipboard, and opening links externally.
👋 New accounts get a "Join Cordn group" button on chat home, so you can hop straight into the official discussion group. Thanks @laser for the idea
🔄 Inviting people to a new group no longer fails entirely if one key package is unreachable, each invite goes out on its own, and anything that fails surfaces as a toast.
🐛 Reloading a group right after inviting someone no longer drops the invite: pending add-member ops are now saved and reapplied on the next open.
🚚 A new migration banner: if you sign in and your account or key packages seem to live on another device, it links you straight to Backup & recovery to link your devices or restore from a backup.
The full release notes live at https://cordn.net/chat/news
Aren't you using Cordn yet? Just start chatting at https://cordn.net/
If you like the project and want to see it grow, please consider contributing in any way you can. Every bit counts, report a bug, contribute with your expertise, send some sats. We are building this together in the open 💛

2026-07-24 14:55:32 UTC

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You can join the cordn dev group or create your own ones, you can also just start chatting with people
Cordn dev group: https://cordn.net/chat/dfa7475d-c9ef-46df-bf85-1f481fdcf2c4?m=eyJuYW1lIjoiQ29yZG4gRGV2IiwiaWNvbiI6IvCfqqIifQ

2026-07-24 14:14:20 UTC

A new patch release is about to drop, fixing some minor issues we discovered after yesterday’s launch. Stay tuned! 📌

2026-07-23 22:07:29 UTC

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No, these are NIP-29 as far as we know. Cordn is based on MLS, closer in spirit to Marmot.

2026-07-23 19:08:16 UTC

If you already have your groups on another device or in the web client, the best way to start with the Android client is to go to your previous client > Config > Backup and Restore on your phone so you can keep all your previous messages. You can also link both devices using the multi-device options. If you don’t care about keeping the history of your previous messages, you could simply link the devices via the multi-device feature, and you’ll get all your groups synced. Enjoy!
#nevent1q…at70

2026-07-23 17:39:28 UTC

🔥 Exciting news 🔥 Cordn native Android app is here 📱
The native Cordn app is now available on ZapStore. This has been a long-requested feature, and it is finally here for everyone. ✨
https://zapstore.dev/apps/naddr1qqxk7un89e3k7unydchxzursqyv8wumn8ghj7un9d3shjtn6v9c8xar0wfjjuer9wcpzps7xmxansh7cyl8ak3wexws73n8jjpd7xpr8z50dtl34dgg22f0fqvzqqqr7pv6zvfm6
The headline reason to install it: push notifications. You no longer have to keep a tab open or keep checking the app to stay on top of your groups.
For the nerds, here is how they actually work. There is no third-party push server and no notification service sitting in the middle. Everything runs on your phone through efficient coordinator fetching, so this is as private and secure as the rest of Cordn.
The app ships with two more cool things:
💎 Amber login, alongside every other login method Cordn already supports, so you can sign in with your preferred Nostr signer.
🔗 A share intent handler, so sharing a link, image, or piece of text straight into a Cordn group is now a single tap from anywhere on your phone.
Prefer the web or a PWA? Nothing changes. You can keep using Cordn in the browser or installed as a PWA exactly as before. The native app is an addition, not a replacement, and it is what finally unblocks reliable notifications, a real requirement these days to not lose a beat in your groups.
This is the first official release and the first milestone in Cordn's native evolution. We tried our best to iron out every bug and edge case, but this is software, so please report anything you find. Feature requests are welcome too.
The full release notes live at https://cordn.net/chat/news
Aren't you using Cordn yet? Just start chatting at https://cordn.net/
If you like the project and want to see it grow, please consider contributing in any way you can. Every bit counts, report a bug, contribute with your expertise, send some sats. We are building this together in the open 💛

2026-07-23 16:34:10 UTC

Hello nostr!