Slack Messenger

Slack Messenger

Slack is a cloud-based team collaboration tool. It was co-founded by Stewart Butterfield, Eric Costello, Cal Henderson, and Serguei Mourachov.

Slack Messenger
Slack Messenger


In the six months since launch, Slack, as the app’s called, has been growing at a breakneck pace. Over 125,000 people use the app every day, among them 13,000 teams at companies as large as eBay, Sony, Yelp, and NBC Universal.

Investors have noticed. Today Slack, which launched less than nine months ago, is announcing that it has raised $120 million, valuing it at $1.12 billion. It had previously raised $60 million. Some of Silicon Valley’s most prominent investors, including Kleiner Perkins Caufield and Byers, Google Ventures, and Andreessen Horowitz, participated in this round.

In January 2015, Slack announced the acquisition of Screen hero, which will be integrated into the Slack software to add voice, video, and screen sharing.

It has won the fastest rising start up award in the 9th Annual Curnchies Award.


Slack Messenger Screenshot
Slack Messenger Screenshot

Key Features

  1. Messages will load faster with offline support. This is helpful, because Slack always has to connect when we open it and that can take more time than we’d like occasionally.
  2. Links open within the app rather than kicking out to an external browser.
  3. New team directory and channel member search. Not everything we need is always right in front of our face on mobile Slack, so having this feature more accessible is helpful.
  4. Search for channels and DMs by tapping the “+” buttons in the left-side menu. Should make it much easier to quickly find where you’re going, which is helpful in a small screen environment.


  • All Team Communication is One Place : Slack communications happen all in one place and can be segmented by creating Channels for various topics. You can assign your users to as many (or as few) channels as you need in order to keep topics visible to the team members you want to see any individual topic.
  • Integration with Services We Already Use:    GitHub – For notification and viewing the code checkins from our development team.   HelpScout – Our email support ticket service. The entire teams sees support ticket submissions in real time.   Trello – Our project organization tool. We see cards created/edited/completed in our Trello portal instantly.
  • All Content is Searchable from One Search Box: Slack makes it dead simple to find that link that someone posted 3 weeks ago that you just now want to go have a look at. Not only is the search super fast and friendly, but it’s also filterable.
  • File Sharing: Slack makes it simple to share these files quickly with our entire team and also has DropBox integration for more in depth file access.
  • Code Snippets: Being able to share and test code snippets across our team in an instant is a great feature of Slack that shouldn’t go unmentioned. This alone has increased our productivity by leaps and bounds.
  • One to One and Private Groups: Just like any other chat client, Slack makes it simple to exchange messages privately between two people.
  • Accessible Anywhere.

Interesting facts

  1. There are now more than 30,000 teams using Slack, a number that has doubled in just the past six weeks.
  2. Slack began as an internal tool used by their company, Tiny Speck, in the development of Glitch, a now defunct online game.
  3. It’s been four years since Stewart Butterfield last sent an email to a work colleague. His team long ago replaced email with a chat app that plugged in to all their favorite services like Twitter, GitHub, and Dropbox.
  4. Butterfield’s last startup, Flickr, also began as a side project but ended up changing photo-sharing forever. With Slack, it seems he’s found his latest accidental success.