Flowdock vs Discord

An easy & simple interface to filter chat discussion into separate threads.

Files can be dragged and dropped in to the flow dock screen for upload.

Browser Based, as well as:

• iPhone and iPad App
• Android App
• Mac OS X App

Content and discussions are stored forever.

Able to speak privately/talk head-to-head.

A specific user or everyone in the channel can be notified via @user or @everyone respectively.

Flowdock API allows developers the freedom to create custom integrations.

You can interact with Github directly from Flowdock to create PRs.

Back up conversations and files fully at any time.

On top of our 50+ custom integrations, easily integrate any tool that sends emails or generates RSS feeds, as well as having the option to build a custom integration with Flowdock's API

Allows co-workers to know what you’re up to "/status I'm busy today!"

Google Apps get a Flowdock link to the Apps tool-bar and won't have to separately manage users

When working with stakeholders (clients or partners) you can add organizations to manage internal privacy

Discord follows the same type of interface design popularised by Slack, which is extremely clean and attractive, and doesn't clutter the interface with unnecessary chrome and cruft.

Unlimited amount of users.

Users can invite others to join a Discord channel via a web link, which means no installation is required to use the software - which is one of the big typical barriers to entry for social software.

Discord allows inviting people to a specific channel with a link. Links can be set to expire. Low effort/passive invite mechanics.

You can quickly send invites to people and they can join in using the web client without having to create an account or install the app.

Behaves and looks like Slack for regular text channels, but with the ability to create voice channels as well

Deny access, Deny write message, Allow read messages etc.

Discord provides an API for creating custom bots.

Discord has a wide variety of bots for things from airhorn noises to automated server management, to leveling systems for chat. The bot API is open and there are dedicated sites for finding bots.

Discord shows which game each user is currently playing, which among other things helps users to form PUGs with minimal hassle.

For those that are used to the way Slack (a similar chat client) works, Discord will be familiar in its use, which lowers the learning curve quite a bit for those that have switched or tried Slack before.

The support is limited but still exists. It's a killer feature for dev teams.

Discord prevents users from being DDoSed out of games.

Targeting roles allows for quickly requesting someone from a group e.g. artist, moderator, etc.

Ability to create channel categories for channels to sit inside of.

Free account have no tangible restrictions.
Premium account is just a way to say "thank you" to developers. And it work for all servers of discord (not as in slack). And it can be purchased by one who wants. In contrast to Slask, where all active members of the server should be "premium".

Have localization for many language, including Russian.