SimpleX alternative
A private SimpleX alternative
SimpleX is a privacy messenger with no user identifiers, using relay servers you can self-host.
Why PrivaMesh is a strong SimpleX alternative
SimpleX and PrivaMesh both eliminate user IDs and phone numbers. The difference is the transport: SimpleX uses message-queue relay servers, while PrivaMesh uses the Solana blockchain as a public, verifiable transport with on-chain, wallet-signed key discovery.
PrivaMesh also bundles a self-custodial wallet for in-chat SOL transfers and on-chain identity. If an auditable public transport and built-in payments appeal to you, PrivaMesh is the alternative.
What SimpleX gets right
SimpleX has arguably the most rigorous identity model in the field: there is no user identifier at all, not even a random one, because contacts connect through one-time invitation links to unidirectional message queues. It has double-ratchet forward secrecy, the relays are self-hostable, it is open source, and there are no per-message fees. On privacy design, SimpleX is a serious peer.
Where PrivaMesh differs
The honest answer is that these are two good designs solving the same problem differently. SimpleX relies on relay servers - self-hostable, which is the point, but somebody still runs them and availability depends on them. PrivaMesh uses a public chain nobody operates, adds wallet-signed on-chain key discovery so contact verification needs no directory, and folds a self-custodial wallet into the same key. The cost is a per-message network fee and a permanent encrypted record on-chain.
PrivaMesh vs SimpleX, side by side
| Feature | PrivaMesh | SimpleX |
|---|---|---|
| User identifier | One-time addresses per message | None at all - queue-based connections |
| Transport | Encrypted blobs in Solana transaction memos | Message-queue relay servers |
| Who runs it | Public chain, swappable RPC | SimpleX relays, self-hostable |
| Forward secrecy | Double Ratchet, per message | Double Ratchet, per message |
| Cost per message | A fraction of a cent | Free |
| Built-in wallet | Yes - in-chat SOL transfers | No |
Switch to PrivaMesh if
- You want a transport nobody has to operate or host
- On-chain, wallet-signed key discovery beats exchanging invitation links for you
- You want a self-custodial wallet in the same app and the same key
- You are on iOS and want the payments side
Stay on SimpleX if
- You want zero per-message cost
- You would rather self-host your own relays than write to a public chain
- You need Android or desktop clients today
- A permanent on-chain encrypted record is not something you want to create
Frequently asked questions
Is SimpleX or PrivaMesh more private?
Both remove user identifiers and both have per-message forward secrecy. SimpleX has the stronger claim on identity - there is no identifier at all. PrivaMesh has the stronger claim on infrastructure - there is no server anyone has to run. Which matters more depends on your threat model.
What is the real difference in transport?
SimpleX routes through message-queue relays that you can self-host. PrivaMesh writes encrypted blobs into Solana transaction memos, so the transport is public and auditable but nobody operates it and each message costs a small fee.
Does writing messages on-chain create a permanent record?
Yes - an encrypted, padded blob addressed to a one-time address. Content is unreadable and the addresses cannot be clustered into a conversation, but the ciphertext does persist. SimpleX leaves nothing behind, which some threat models will prefer.
How do I verify a contact’s keys?
PrivaMesh publishes wallet-signed prekey bundles to an on-chain registry, so you verify a signature rather than trust a directory. SimpleX uses one-time invitation links exchanged out of band.