Pure instant messaging — simple, fast, secure, and synced across all your devices.

FAST: Cellgram is the fastest messaging app on the market, connecting people via a unique, distributed network of data centers around the globe.

SYNCED: You can access your messages from all your phones, tablets, and computers at once. Cellgram apps are standalone, so you don’t need to keep your phone connected. Start typing on one device and finish the message from another. Never lose your data again.

UNLIMITED: You can send media and files, without any limits on their type and size. Your entire chat history will require no disk space on your device and will be securely stored in the Cellgram cloud for as long as you need it.

SECURE: We made it our mission to provide the best security combined with ease of use. Everything on Cellgram, including chats, groups, media, etc. is encrypted using a combination of 256-bit symmetric AES encryption, 2048-bit RSA encryption, and Differ–Hellman secures key exchange.

100% FREE & OPEN: Cellgram has a fully documented and free API for developers, open-source apps, and verifiable builds to prove the app you download is built from the exact same source code that is published.

POWERFUL: You can create group chats with up to 200,000 members, share large videos, documents of any type (.DOCX, MP3, ZIP, etc.) up to 2 GB each, and even set up bots for specific tasks. Cellgram is the perfect tool for hosting online communities and coordinating teamwork.

RELIABLE: Built to deliver your messages using as little data as possible, Cellgram is the most reliable messaging system ever made. It works even on the weakest mobile connections.

FUN: Cellgram has powerful photo and video editing tools, animated stickers and emoji, fully customizable themes to change the appearance of your app, and an open sticker/GIF platform to cater to all your expressive needs.

SIMPLE: While providing an unprecedented array of features, we take great care to keep the interface clean. Cellgram is so simple you already know how to use it.