SimpleX Chat vs Tox (qTox)
Side-by-side comparison of features, pricing, ratings, and alternatives.
SimpleX Chat is an open-source, end-to-end encrypted messenger built around a network design with no persistent user identifiers of any kind, not even random ones. Messages are relayed through servers that see only noise, so there is no phone number, username, or account ID for anyone, including SimpleX, to tie back to a person. The app supports one-to-one and group chats, audio and video calls, file transfer, and multiple chat profiles, and it can run on self-hosted servers for organizations that want full control over their infrastructure. Its protocol and clients are fully open source and have been independently security-audited by Trail of Bits.
Tox is an open, peer-to-peer messaging protocol built to let people communicate without anyone else listening in, and without relying on centralized servers that could be compromised or monitored. Official and community clients built on the protocol - including qTox for desktop, Toxic for Linux terminals, and aTox for Android - provide encrypted instant messaging, voice and video calls, screen sharing, and file transfers with no artificial size limits. Tox is completely free and comes with no advertising, ever, and is developed openly by its user community rather than a company. Its distributed network architecture means there is no central point of failure or control, and both the protocol and its libraries are free and open source.
- No user IDs of any kind, unlike most messengers that rely on phone numbers or usernames
- Fully open-source and independently security-audited
- Self-hostable servers for full infrastructure control
- Free to use across web, desktop, and mobile
- Fully decentralized protocol with no central servers to compromise or shut down
- Completely free with no ads and no paid tier, ever
- Unlimited file transfer size compared to many mainstream messengers
- Open source protocol and clients allow independent security review
- No central identity means account recovery works differently than typical messengers
- Smaller network effect than mainstream messaging apps
- Some features are more geared toward technical/privacy-focused users
- Smaller ecosystem and user base than mainstream apps makes finding contacts harder
- Peer-to-peer connections can be less reliable behind restrictive NATs/firewalls without relays
- Client polish varies since Tox itself is a protocol implemented by separate community-maintained apps
More alternatives & similar tools
Alternatives to SimpleX Chat
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Free, peer-to-peer messaging and calling app with no servers and no personal data required.
An encrypted messenger that runs over standard email servers instead of a proprietary network.
Free, distributed, encrypted messaging protocol with no central servers and no ads, ever.
Alternatives to Tox (qTox)
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The Verdict
AI-generated from listing dataSimpleX Chat offers free, open‑source, self‑hostable messaging with no user IDs and audited security, while Tox (qTox) provides a fully decentralized, peer‑to‑peer protocol with unlimited file sizes but less reliable connectivity.
Key differences
- •Identity model: SimpleX uses no persistent IDs and relies on self‑hosted relays; Tox uses a distributed peer‑to‑peer network with no central servers.
- •Connectivity reliability: SimpleX routes messages through relay servers that hide metadata; Tox’s pure P2P can struggle behind NATs/firewalls.
- •File transfer limits: Tox explicitly offers unlimited file size; SimpleX does not specify limits.
- •Audit and verification: SimpleX has independent security audits (2022, 2024); Tox has no mentioned audits.
- •Self‑hosting: SimpleX provides optional self‑hosted relay and file servers; Tox has no self‑hosting component.
Pricing & value
Both are free to use with no paid tiers.
Ease of use / learning curve
SimpleX offers web, desktop, and mobile apps with profiles; Tox requires handling P2P connections and may need relay setup.
Features & depth
Tox includes unlimited file transfer, screen sharing, and combined group chat/call features not listed for SimpleX.
Integrations & ecosystem
SimpleX can be self‑hosted, allowing integration into private infrastructure; Tox relies on community clients only.
Collaboration
Tox supports screen sharing and unlimited file sizes, enhancing collaborative work.
Scalability
SimpleX’s relay architecture can scale via self‑hosted servers; Tox’s pure P2P may degrade with many peers.
Support
Both rely on community documentation; Tox explicitly lists GitHub issues, SimpleX provides no support details.
Security & privacy
SimpleX has independent audits (2022, 2024) and no user IDs; Tox lacks documented audits.
Migration / lock‑in
SimpleX’s self‑hosted option lets organizations control data; Tox’s decentralized network offers no central migration path.
Choose SimpleX Chat if…
Privacy‑focused users or organizations needing audited security and self‑hosted control.
Choose Tox (qTox) if…
Teams needing unlimited file sharing, screen sharing, and tolerant of P2P connectivity quirks.
Common questions
Is there any cost to use either messenger?
Both SimpleX Chat and Tox (qTox) are free with no paid tiers.
Which solution has been independently security‑audited?
SimpleX Chat was audited by Trail of Bits in 2022 and 2024; Tox has no specified audits.
Can I self‑host the messaging infrastructure?
SimpleX Chat allows self‑hosted relay and file‑transfer servers; Tox does not provide a self‑hosting component.