HipChat is an application service provider that allows users to create and participate in chat rooms and send one-on-one messages with other people in a group-centric format.
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Pro Available on Web, Mac, Windows, Linux, iOS, Android
You can access HipChat from pretty much every common platform. HipChat even allows chatting via SMS.
Pro Powerful @mentions
You can ping people to get their attention even if they are not online by @mentioning them. Depending on how the person has set their account up it can be by notifications via in-app sounds, visual alerts, and even email, SMS, or mobile app push notifications.
Pro Simple, easy to use
An intuitive, easy to overview interface listing both online and offline users.
Pro Huge list of integrations
Pro Desktop client
HipChat has an optional desktop client powered by Adobe AIR.
Free with unlimited users, $2/user/month for voice + video calls, screencasts, full history retention and management.
Pro Syntax coloring
Pasted code can be colored based on syntax.
Pro Embeds files
Things like photos get automatically embedded in the chat thread once you upload them.
Pro "Rooms" for persistent group chat
Participate and keep tabs on ongoing discussions on particular topics or amongst certain groups of people.
Pro Guest access
You can invite people to join conversations even if they don't have a HipChat account. HipChat will generate a link to share and the guest will only need to enter their name to join the conversation.
Pro Good audio and video support
HipChat audio and video works on mobile platforms and web browsers.
Pro Plentiful GIFs and custom Emoticons
Pro Powerful command system
E.g. part, away, all, here etc.
Pro Self-Hosting Available
If you ware worried about third-parties getting access to your data you should consider self-hosting. With self-hosting you are in control over where your data is stored, who has access to it. You will also not be vulnerable to exploits of a third-party provider.
Con Reliability of service has been weak
The reliability of the hosted HipChat service, particularly in the early days of version 4.x, has not been a strong suit.
Con Only one-on-one video calls
There is no option for multi-user conference calls.
Con Free plan has limited storage
Free plan comes with 5GB of storage, where as paid plan has "Unlimited".