Discord is a free-to-use VoIP and instant messaging app targeted primarily at gaming communities.
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Pro Accessible to anyone
Discord is 100% free, with no limit on how many channels a user can create. This makes for a good way to continue gaming with your friends without paying anything extra.
Pro Simple UI
The interface is very easy to follow - you have three sections. On the left are the channels for your server, which you can quickly and easily switch between. The large section in the middle is the main chat area, where each message has the person's username, avatar (or image), and timestamp. On the right is a list of all the people in the chat, where it also ways what games each person is playing (if applicable and set up by the user).
Pro Can be used in browser
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.
Pro Easy setup
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.
Pro User friendly
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.
Pro Easily communicate away from PC
Discord has a fully-featured mobile client with push notification support for Android and iOS, which makes it very easy to check in on the app and communicate while out and about.
Pro Good 1-click invite system
Discord allows inviting people to a specific channel with a link. Links can be set to expire.
Pro User feedback
Pro Visually appealing
Has a very nice, dark themed skin to it and looks very sleek.
Pro In-game overlay
See who's talking, adjust voice controls; all without leaving the game.
Pro Bots integration
Pro DDoS user protection
Discord prevents users from being DDoSed out of games.
Pro Excellent voice quality
Discord uses the Opus codec, specifically developed for low latency VoIP chat.
Pro Resource light
The desktop client isn't very demanding on system resources, making it lightweight and ideal to have running alongside any game.
Con No dedicated servers
You are sharing server bandwidth with every other discord user. Meaning if you are using discord and need voice coms for say example your guild is raiding something, and every other discord user on the planet decides to log on YOUR guilds raid is going to suffer because you don't have dedicated bandwith discords overall performance will suffer immensely.
Con Servers only in select regions
Servers are currently only available in the US, Europe, Singapore, Brazil, and Australia. This can mean poor latency for users located elsewhere.
Con Push-to-talk only works in Desktop Client
If you favor using Discord in browser, push-to-talk is not available. Push-to-talk is great because it prevents accidental sounds that can be distracting to other chatters.
Con It sometimes drops voice and sound
A restart is required to fix.
Con No positional audio
Positional audio means that different players/users sound like coming from different positions, sometimes even related to their actual position in the game. This helps especially for voice chats with more than 2 people.
Con Financial scam
The owner and CEO of Discord Jason Citron has secured nearly 20 million in investment funds for Discord. Discord is something that is free it is not a money making machine. Currently the only way Discord is staying afloat is by continually securing new investor funds. Jason Citrons track record shows a pattern of starting a business attracting large investors then walking away with the company bankrupt or sold and his pockets filled. 20 million dollars would have produced a product light-years better than discord, something fishy is going on.
Con Browser voice chat is buggy
Bugs such as not being able to hear the other person (or them you).
Con Permission system is very basic
There is such a thing as being too basic. They claim it's easy to manage permissions, but many people find it to be very vague and elementary. No community or server owner could be flexible in this system.
Con Voice delay
Once you speak into your mic, there is a short delay and then you and your friends hear your voice again.
Con Possible fishing issue
Discord does not own Discord.com, meaning it would be incredibly easy to set up a fishing website and steal information from unsuspecting gamers.
Con Focused on streamers and not communities
Discord focuses on streamers and not the communities, many implementations over the last year have been geared towards streamers and future updates they promise continue to be geared towards streamers.
Con Desktop apps have limited resizing options
The app could be more compact.
Con Limited text-chat features
While Discord promotes itself as a strong competitor to both Teamspeak and Skype, it simply does not match the text features found in Skype, Slack or most IRC clients.
For example, there is still no built-in way to search (Yes, CTRL+F) conversations. Additionally, there is no way to built-in way manually download and analyze conversation history.
Con The voice chat service has lots of issues
It breaks up and drops data packets to the point of being useless in most cases.
Con Connection issues are severe
Many people have serious connection issues with Discord at one time or another, which occasionally requires a complete system reset or software reinstallation.