Jami is a free, open-source communication platform backed by the Free Software Foundation as a GNU project. It provides instant messaging, audio/video calls, group chats, video conferencing, and screen sharing, all built on a fully peer-to-peer architecture that doesn't rely on central servers to relay communication. Because Jami is serverless and end-to-end encrypted with perfect forward secrecy, it requires no personal information to create an account and can even work over a local network without internet access. It's available on Linux, Windows, macOS, iOS, Android, and Android TV, and includes an extension platform and SIP client support for added flexibility.
Viber lets users send instant messages, share media, and make voice or video calls worldwide over data or Wi‑Fi. It offers end‑to‑end encryption for private conversations and a rich sticker store for expressive chats. The service works on smartphones, tablets, and desktops, syncing contacts and chat history across devices, and includes group chat tools and public accounts for businesses and creators.
- Completely free and open source with GNU/FSF backing
- True peer-to-peer architecture means no company server can see or store your data
- No personal information required to create an account
- Works on a local network even without internet, useful for offline or restricted environments
- Free core messaging and calling
- End‑to‑end encryption for privacy
- Large user base and cross‑platform support
- Rich sticker and media sharing features
- Peer-to-peer connections can be less reliable than server-relayed apps behind strict NATs or firewalls
- Smaller mainstream user base than Signal or WhatsApp makes contact adoption harder
- Interface and feature discoverability are less polished than mainstream commercial messengers
- Calls to non‑Viber numbers require paid credits
- Limited integration with third‑party business tools
- Desktop app can be resource‑heavy on older machines
More alternatives & similar tools
Alternatives to Jami
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A decentralized, end-to-end encrypted messenger that needs no phone number or email to use.
Free, distributed, encrypted messaging protocol with no central servers and no ads, ever.
Alternatives to Viber
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The Verdict
AI-generated from listing dataJami offers completely free, open‑source, server‑less communication with strong privacy, while Viber provides a larger user base and richer media features but relies on cloud servers and a freemium model.
Key differences
- •Jami is peer‑to‑peer with no central servers; Viber uses cloud SaaS infrastructure.
- •Jami is fully free and open source; Viber is freemium with paid credits for non‑Viber calls.
- •Viber supports up to 250‑person groups and a sticker marketplace; Jami caps groups at a few participants and lacks built‑in stickers.
- •Jami requires no personal data to create an account; Viber requires a phone number or email.
- •Viber offers an API and live‑chat support; Jami has only community forums and no API.
Pricing & value
Jami is completely free and open source; Viber is freemium and charges credits for calls to non‑Viber numbers.
Ease of use / learning curve
Viber’s mainstream UI and large user base make onboarding easier than Jami’s less polished interface.
Features & depth
Viber provides larger group chats (250), stickers, and adaptive video quality; Jami lacks these media‑rich features.
Integrations & ecosystem
Viber offers an API and live‑chat support; Jami has no API and only community forums.
Collaboration
Jami works over local networks without internet, enabling offline collaboration; Viber requires internet connectivity.
Scalability
Viber’s cloud SaaS scales to many users globally; Jami’s peer‑to‑peer model can struggle behind strict NATs.
Support
Viber provides email and live‑chat support; Jami relies solely on community forums and documentation.
Security & privacy
Jami’s true peer‑to‑peer architecture and no personal data requirement give stronger privacy than Viber’s cloud‑based service.
Migration / lock‑in
Jami’s open‑source code allows self‑hosting or forks; Viber’s proprietary platform creates vendor lock‑in.
Choose Jami if…
Privacy‑focused individuals or orgs needing offline, server‑less messaging and willing to accept a smaller user base.
Choose Viber if…
Teams or consumers who prioritize a large user base, rich media features, and official support despite cloud reliance.
Common questions
Is there any cost to use either app?
Jami is completely free; Viber is free for core messaging but charges credits for calls to non‑Viber numbers.
Can I use the apps without an internet connection?
Jami can operate over a local network without internet; Viber requires an internet connection for all functionality.
Which app offers stronger privacy guarantees?
Jami provides end‑to‑end encryption with no central servers and requires no personal data, offering stronger privacy than Viber’s cloud‑based service.