What SimpleX Chat does

SimpleX Chat Ltd is a London-registered private company (company number 13691484, 1–10 employees) that operates SimpleX Chat, an open-source (AGPLv3) private messaging platform launched around 2020. The product is differentiated by the SimpleX Messaging Protocol (SMP) and SimpleX File Transfer Protocol (XFTP), a proprietary protocol stack that routes messages via temporary unidirectional queues rather than user addresses — SimpleX does not assign any identifier to its users, including phone numbers, email addresses, usernames, public keys, or random numbers. Client applications are available on iOS, Android, Windows, macOS, Linux, and as a Terminal CLI, with a TypeScript SDK available for bot and integration development. End-to-end encryption uses a double-ratchet algorithm with forward secrecy and post-compromise security, additional per-queue encryption layers, fixed-size content padding (16kb messages, 64kb–4mb file chunks) to defeat traffic analysis, and IP masking on relay servers.

The business model is currently donation- and grant-funded rather than commercially monetized. Revenue mechanics consist of community donations via GitHub sponsorship and notable institutional inflows: a $370,000 round from Village Global in April 2023, a $1.3 million pre-seed round in August 2024 co-led by Jack Dorsey and Asymmetric Capital Partners, and an approximately $760,000 Ether donation from Vitalik Buterin in November 2025, totaling roughly $2.4 million in capital raised. The product is free for all users with no pricing tiers; a planned 'Community Credits' model targeted for 2027 will charge large channels and communities for server infrastructure and network governance. Go-to-market is product-led and community-led: distribution occurs directly through app stores, F-Droid, TestFlight, and GitHub releases, while awareness is driven by endorsements from Privacy Guides, Whonix, Kuketz Blog, OptOut podcast, Heise, and Cointelegraph, plus organic growth in privacy, cryptocurrency, and open-source operating system communities (Monero, GrapheneOS, Qubes OS, Bitcoin, RoboSats).

The company has announced a planned transition to non-profit governance and a roadmap extending through December 2027 focused on scaling to large communities, launching Community Credits, and releasing community-growth tooling. Adoption signals include more than 2 million downloads and tens of millions of daily messages routed through the network, with two independent Trail of Bits security audits (October 2022 and July 2024) substantiating the protocol's cryptographic claims. Customer concentration is by definition low: the user base is a long tail of privacy-conscious individuals, activists, journalists, and members of interest-based communities, with no disclosed enterprise anchor accounts and no revenue dependency on any single customer segment.

Name

SimpleX Chat

Legal name

SimpleX Chat Ltd

Website

https://simplex.chat

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

1–10 employees

Short description

SimpleX Chat operates a free, open-source, end-to-end encrypted messaging platform whose proprietary protocol assigns no user identifiers of any kind. It serves privacy-conscious individuals, activists, journalists, and interest-based communities (cryptocurrency, open-source OS, security) globally via app stores and direct downloads.

Ownership category

akta.pro rank

Product category

Secure Messaging Software

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182), Wired and Wireless Telecommunications (except Satellite) (5171), Custom Computer Programming Services (541511), Computer Systems Design and Related Services (54151)

SIC

Services-Prepackaged Software (7372), Communications Services, Nec (4899), Telegraph & Other Message Communications (4822), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Community/Group Chat Platforms (BPAMACAH)

Keywords

• Private messaging platform
• End-to-end encryption
• Decentralized chat protocol
• Open-source messenger
• No-identifier messaging

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Software

Cost components

Technology or R&D, Personnel, Infrastructure, Operations, Marketing or Sales

Revenue model

1. Community Donations: SimpleX is primarily funded by user donations via its GitHub sponsorship page. This is the current primary revenue mechanism to maintain independence.
2. Community Credits (Planned): A future funding mechanism where large channels and communities will pay for their servers to cover infrastructure, software development, and network governance costs. This is planned but not yet implemented.
3. Institutional Investment: SimpleX received $1.3 million in pre-seed funding led by Jack Dorsey and Asymmetric Capital Partners, with additional donations from Vitalik Buterin (~$760,000 in ETH). This provides runway for product development and growth.

Pricing tiers

Go-to-market motion1 record

Distribution channels6 records

Marketing channels6 records

Core offering

SimpleX Chat is a free, open-source (AGPLv3) private messaging application that operates without any user identifiers — no phone numbers, emails, usernames, public keys, or random numbers. Messages are routed via temporary unidirectional queues using proprietary SimpleX Messaging Protocol (SMP) and SimpleX File Transfer Protocol (XFTP) stacks, with end-to-end double-ratchet encryption. The product is distributed across iOS, Android, Windows, macOS, Linux, and a terminal CLI, with supporting infrastructure including self-hostable relay servers, a community directory, and a TypeScript SDK for chat bot development.

Product overview

SimpleX Chat is a decentralized communication platform built around a privacy-first architecture with no user identifiers of any kind — not phone numbers, emails, usernames, or even random numbers. The core product portfolio includes mobile applications (iOS, Android), desktop applications (Windows, macOS, Linux), and a command-line interface (CLI), all built on the SimpleX Chat Protocol. Supporting infrastructure includes the SimpleXMQ/SMP protocol stack for message routing, SMP and XFTP server software for self-hosting, and the SimpleX Directory for discovering public communities. The platform uses end-to-end encryption with double-ratchet algorithm for forward secrecy and post-compromise security, with relay servers that cannot access message content or user connection graphs. SimpleX also offers business address functionality for customer engagement, positioning itself for both individual privacy-focused users and business use cases.

Differentiator

Problem solved

Functional benefit

Brands

• SimpleX Directory: A directory service for discovering and joining SimpleX communities and groups
• SimpleX for Business
• Community Credits

Products and services

• SimpleX Chat (Mobile) Free, private, open-source messaging application for iOS and Android that operates without requiring user identifiers such as phone numbers or accounts. The app stores user profiles locally, uses end-to-end encryption for messages, audio, and video calls, and employs relay servers to mask IP addresses during calls. Available on the Apple App Store, Google Play, F-Droid, and TestFlight.
• SimpleX Chat (Desktop) Desktop application for Windows, macOS, and Linux providing the same privacy-focused messaging features as the mobile app, including no user identifiers, local profile storage, end-to-end encryption, and audio/video call support. Distributed via direct download from simplex.chat/downloads and via GitHub releases.
• SimpleX Chat CLI (Terminal) Command-line interface client for SimpleX Chat, allowing terminal-based access to the SimpleX network for messaging and bot development purposes. Used by developers and advanced users to automate and integrate with the SimpleX messaging platform.
• SimpleX Directory Experimental directory service for discovering and joining public SimpleX groups and communities. Available via the app, web browser, or as a SimpleX chat bot. Groups must have at least 10 members to be listed.
• SimpleX Chat for Business Business address feature allowing organizations to accept customer requests, provide support, and engage with users who value privacy. Business chats combine features of direct conversations and groups, similar to WeChat business accounts, and provide a long-term contact address for customer inquiries, purchases, and support.

Quantifiable outcome

• More than 2 million people have downloaded SimpleX apps
• +2 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

One partnership is on record.

• Trail of BitscoreTechnology or IntegrationTrail of Bits conducted two independent security reviews of SimpleX Chat: an implementation security assessment in October 2022 (covering cryptography and networking), with most fixes released in v4.2; and a cryptographic protocol design review in July 2024, resulting in v6.1 with improved calls and user experience. These audits validate SimpleX's security claims and are prominently featured on the website.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Signal: Signal is the leading end-to-end encrypted messenger and the most direct competitor to SimpleX Chat, serving privacy-conscious users on iOS, Android, and desktop. Unlike SimpleX, Signal requires a phone number as user identifier, making SimpleX's no-identifier architecture the key differentiator.
• Wire: Wire is an end-to-end encrypted messaging and collaboration platform with strong enterprise focus. It is comparable to SimpleX on secure messaging fundamentals but uses identity-bound accounts and competes for the same privacy-focused business segment SimpleX for Business targets.
• Element (Matrix): Element is the flagship client for the Matrix open protocol, providing federated end-to-end encrypted messaging with decentralized servers. It competes with SimpleX in the decentralized/privacy messenger category and offers a federated alternative to SimpleX's novel no-identifier queue architecture.
• Session: Session is a decentralized, end-to-end encrypted messenger using onion routing and random Session IDs instead of phone numbers. It is a direct peer in the privacy-messenger category and a fellow recipient of Vitalik Buterin's privacy-messaging donations.
• Threema: Threema is a Swiss-based end-to-end encrypted messenger that, like SimpleX, does not require a phone number and offers anonymous use via random Threema ID. It is a direct paid privacy-messenger competitor with strong enterprise and EU adoption.

Emerging players

• Briar: Briar is an open-source peer-to-peer messenger designed for activists and journalists, supporting messaging over Tor, Wi-Fi, and Bluetooth without central servers. It is comparable to SimpleX in its extreme privacy positioning but addresses a narrower, higher-risk user base with limited scalability.
• Keybase: Keybase (acquired by Zoom) provides end-to-end encrypted messaging, file sharing, and identity verification using cryptographic keypairs. It overlaps with SimpleX on privacy messaging and crypto-community identity concepts, though now operated within Zoom's broader stack.
• Delta Chat: Delta Chat is an open-source messenger that tunnels chat over standard email (SMTP/IMAP), enabling decentralized communication without a proprietary server. It is comparable to SimpleX as an emerging privacy/decentralized messaging alternative with a different architectural approach.

Broad incumbents

• Telegram: Telegram is a mass-market messaging platform with optional end-to-end encrypted Secret Chats and large group/channel functionality. It overlaps with SimpleX on community/group chat use cases but uses phone-number-based identity, making it a broad incumbent rather than a direct privacy-messenger competitor.
• WhatsApp: WhatsApp is the dominant global messaging app with end-to-end encrypted Signal-protocol messaging but mandatory phone-number identifiers and central servers. It is a broad incumbent defining the status quo that privacy-first messengers like SimpleX position against.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• GitHubgithub.com/simplex-chat/simplex-chat
• Xx.com/simplexchat
• LinkedInlinkedin.com/company/simplex-chat

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds2 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SimpleX Chat