Dropbox vs TextSecure

You can use Dropbox via website, by installing a desktop client that creates a folder that you simply drag and drop files into, or with their mobile app. Everything synchronizes across all devices used and cloud storage. And Dropbox offers easy methods of sharing whatever is within it.

Dropbox is available on iOS, Android, BlackBerry, Windows, OS X and Linux. By having a client for so many OS's pretty much anyone is covered no matter what kind of device or OS they are using.

Using a desktop client: right click on the folder you want to share and select Dropbox > Share This Folder, then enter the e-mail addressees of people you want to share the folder with.

If a small portion of the file is changed it sends/receives only the differences (not the whole file), which is fast and bandwidth-efficient.

Whether using desktop client or web interface, simply right click on the file you want to share and select Dropbox > Share link, then send the link to the people you want to share the file with. The recipient does not require a Dropbox account.

Dropbox personal accounts start out free, with 2GB of space, but users can get extra space by recommending the site to friends, or taking part in events like "Dropquest", where users can win extra space by solving puzzles.

Dropbox offers native Linux support, integrates with Nautilus file manager.

As long as you have enough storage available, you can upload files of any size using Dropbox desktop client.

To save bandwidth and download speed you can choose to compress a folder into a zip archive for download.

To not slow down the network or save traffic you can limit the upload and download speeds of Dropbox.

There are official and third-party Dropbox add-ons that extend the functionality of the service and add ease of use of existing features.

Additionally, Dropbox can be integrated with existing applications to bring its functionality to other apps.

Dropbox keeps deleted and earlier versions of files for a month.

Your files always synced online means instant disaster recovery. When your hard drive becomes unbootable, pick up another laptop and just carry on with your life from where you last saved.

You get extra free space for you and your friend if they sign up.

Uses Curve25519, AES-256, and HMAC-SHA256. The security of these algorithms has been tested over many years of use in hundreds of different applications. Messages sent via TextSecure are end-to-end encrypted, which means that they can only be read by your intended recipients. We make it easy for you to verify that you are communicating with the right people and that no MITM attack has occurred. The keys that are used to encrypt your messages are stored on your device alone, and they are protected by an additional layer of encryption if you have a passphrase enabled.

TextSecure is free and open source, enabling anyone to verify its security by auditing the code. TextSecure is the only private messenger that uses open source peer-reviewed cryptographic protocols to keep your messages safe.

To pass EFF's security review TextSecure had to encrypt data in transit, the encryption had to be end-to-end, the app needed to provide forward secrecy, app's source code has to be open to independent review, users have to be able to verify contact's identities even with the service provider compromised, app's cryptographic design has to be well documented and app's source code has to have been audited in the last 12 months.