Sid is a secure communication tool with end-to-end encryption.

Communicate more securely and efficiently than with email. Privately, in the office or as a team. Share documents, pictures and large files encrypted and quickly thanks to the direct connection between the devices.

* Fast communication - one-to-one or within groups

Set up your Sid address easily and start right away with secure messaging and file transfer. No phone number or email address is required.

* Security by Design

Sid uses end-to-end encryption for every message and file transferred. The encryption keys are generated and stored on your devices only. Unlike other password driven systems, your private key is used for authorization and authentication.

When working with Sid, your data is safe and no third-parties can decipher the data while being transferred. No one will be able to read your messages or decrypt your files.

We only support clients that run on your device natively to ensure maximum security.

* Available for mobile and desktop

Sid clients are available for desktop computers, laptops and as native apps. You can use it on your computer in the office or on your smartphone anywhere else. Whatever you do on one device is reflected on all other devices, so everything is kept in sync.

* Share documents and files of any kind safely and quickly

Transfer documents, photos, videos, music, etc. in the fastest possible way and without size constraints. If possible, the local network is used.

This makes it possible to exchange files of any size and size with individuals, groups and between all your devices.

What's New

Version 1.164

- fixing possible crashes when syncing devices


Spherebox UG (haftungsbeschrankt)
95.1 MB
Requires iOS 8.2 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, German
Age Rating
Rated 4+
© Spherebox UG (haftungsbeschränkt)


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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