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Make a private connection via link / QR code to send messages and make calls. Privacy redefined. Other apps have user IDs: Signal, Matrix, Session, Briar, Jami, Cwtch, etc.

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SimpleX does not, not even random numbers . This radically improves your privacy. Why user IDs are bad for privacy? When users have persistent identities, even if this is just a random number, like a Session ID, there is a risk that the provider or an attacker can observe how the users are connected and how many messages they send. They could then correlate this information with the existing public social networks, and determine some real identities. Even with the most private apps that use Tor v3 services, if you talk to two different contacts via the same profile they can prove that they are connected to the same person. SimpleX protects against these attacks by not having any user IDs in its design. And, if you use Incognito mode, you will have a different display name for each contact, avoiding any shared data between them. How does SimpleX work? Many users asked: if SimpleX has no user identifiers, how can it know where to deliver messages? To deliver messages, instead of user IDs used by all other networks, SimpleX uses temporary anonymous pairwise identifiers of message queues, separate for each of your connections — there are no long term identifiers. You define which server(s) to use to receive the messages, your contacts — the servers you use to send the messages to them. Every conversation is likely to use two different servers. This design prevents leaking any users' metadata on the application level. To further improve privacy and protect your IP address you can connect to messaging servers via Tor. Only client devices store user profiles, contacts and groups, the messages are sent with 2-layer End-to-end encryption . Security assessments. Trail of Bits is a leading security and technology consultancy whose clients include big tech, governmental agencies and major Blockchain projects. Trail of Bits reviewed SimpleX network cryptography and networking components in November 2022. Read more. Trail of Bits reviewed cryptographic design of SimpleX network protocols in July 2024. Read more. Make a private connection. The video shows how you connect to your friend via their 1-time QR-code, in person or via a video link. You can also connect by sharing an invitation link. Why privacy matters. Preserving the privacy of your metadata — who you talk with — protects you from: Advertising and price discrimination. Privacy saves you money. Many large companies use information about who you are connected with to estimate your income, sell you the products you don't really need, and to determine the prices. Online retailers know that people with lower incomes are more likely to make urgent purchases, so they may charge higher prices or remove discounts. Some financial and insurance companies use social graphs to determine interest rates and premiums. It often makes people with lower incomes pay more — it is known as 'poverty premium'. SimpleX network protects the privacy of your connections better than any alternative, fully preventing your social graph becoming available to any companies or organizations. Even when people use servers preconfigured in SimpleX Chat apps, server operators do not know the number of users or their connections. Manipulation of elections. Privacy gives you power. Not so long ago we observed the major elections being manipulated by a reputable consulting company that used our social graphs to distort our view of the real world and manipulate our votes. To be objective and to make independent decisions you need to be in control of your information space. It is only possible if you use private communication network that does not have access to your social graph. SimpleX is the first network that doesn't have any user identifiers by design, in this way protecting your connections graph better than any known alternative. Prosecution due to innocent association. Privacy protects your freedom. Everyone should care about privacy and security of their communications — harmless conversations can put you in danger, even if you have nothing to hide. One of the most shocking stories is the experience of Mohamedou Ould Salahi described in his memoir and shown in The Mauritanian movie. He was put into Guantanamo camp, without trial, and was tortured there for 15 years after a phone call to his relative in Afghanistan, under suspicion of being involved in 9/11 attacks, even though he lived in Germany for the previous 10 years. Ordinary people get arrested for what they share online, even via their 'anonymous' accounts, even in democratic countries. It is not enough to use an end-to-end encrypted messenger, we all should use the messengers that protect the privacy of our personal networks — who we are connected with. Make sure your messenger can't access your data! Why SimpleX is unique. You have complete privacy. SimpleX protects the privacy of your profile, contacts and metadata, hiding it from SimpleX network servers and any observers. Unlike any other existing messaging network, SimpleX has no identifiers assigned to the users — not even random numbers . You are protected from spam and abuse. Because you have no identifier or fixed address on the SimpleX network, nobody can contact you unless you share a one-time or temporary user address, as a QR code or a link. You control your data. SimpleX stores all user data on client devices in a portable encrypted database format — it can be transferred to another device. The end-to-end encrypted messages are held temporarily on SimpleX relay servers until received, then they are permanently deleted. You own SimpleX network. The SimpleX network is fully decentralised and independent of any crypto-currency or any other network, other than the Internet. You can use SimpleX with your own servers or with the servers provided by us — and still connect to any user. Full privacy of your identity, profile, contacts and metadata. Unlike other messaging networks, SimpleX has no identifiers assigned to the users . It does not rely on phone numbers, domain-based addresses (like email or XMPP), usernames, public keys or even random numbers to identify its users — SimpleX server operators don't know how many people use their servers. To deliver messages SimpleX uses pairwise anonymous addresses of unidirectional message queues, separate for received and sent messages, usually via different servers. This design protects the privacy of who you are communicating with, hiding it from SimpleX network servers and from any observers. To hide your IP address from the servers, you can connect to SimpleX servers via Tor . The best protection from spam and abuse. Because you have no identifier on the SimpleX network, nobody can contact you unless you share a one-time or temporary user address, as a QR code or a link. Even with the optional user address, while it can be used to send spam contact requests, you can change or completely delete it without losing any of your connections. Ownership, control and security of your data. SimpleX Chat stores all user data only on client devices using a portable encrypted database format that can be exported and transferred to any supported device. The end-to-end encrypted messages are held temporarily on SimpleX relay servers until received, then they are permanently deleted. Unlike federated networks servers (email, XMPP or Matrix), SimpleX servers don't store user accounts, they only relay messages, protecting the privacy of both parties. There are no identifiers or ciphertext in common between sent and received server traffic — if anybody is observing it, they cannot easily determine who communicates with whom, even if TLS is compromised. Fully decentralised — users own the SimpleX network. You can use SimpleX with your own servers and still communicate with people who use the servers preconfigured in the apps. SimpleX network uses an open protocol and provides SDK to create chat bots, allowing implementation of services that users can interact with via SimpleX Chat apps — we're really looking forward to see what SimpleX services you will build. If you are considering developing for the SimpleX network, for example, the chat bot for SimpleX app users, or the integration of the SimpleX Chat library into your mobile apps, please get in touch for any advice and support. Features. E2E-encrypted messages with markdown and editing.













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