Miscellaneous Video Meetings

Slack usage stats for 2021

Slack key statistics

  • Slack generated $902 million revenue between March 2020 to April 2021, a 43 percent increase year-on-year
  • Net loss also decreased from $567 million to $292 million in that same period
  • Slack has 12 million daily active users and 156,000 organisations subscribe to the app
  • In December 2020, Slack was acquired by Salesforce for $27.7 billion

Slack overview

Launch date14 August 2013
HQSan Francisco, California
PeopleStewart Butterfield (co-founder, CEO), Cal Henderson (co-founder, CTO)
Business typePublic
IndustryBusiness communication

Slack revenue

2014$12 million
2015$30 million
2016$100 million
2017$200 million
2018$221 million
2019$401 million
2020$630 million
2021$902 million

Note: Slack’s fiscal year runs from March to April. Q4 2021 results were published in March 2020, so yearly revenue for 2020 consists of April 2019 to March 2020. 

Sources: Slack, Business Insider

Slack profit

2017($146 million)
2018($140 million)
2019($138 million)
2020($567 million)
2021($292 million)

Note: Parentheses indicates loss. 

Sources: Slack, VentureBeat

Slack users

20152 million
20164 million
20176 million
20188 million
201912 million

Note: Slack has not updated its daily active user figures since 2019. It had 10 million concurrents during the first coronavirus pandemic in April 2020 

Sources: Slack, Fast CompanyThe Verge

Slack paying customers

YearPaying customers

Source: Slack

Slack organisations


Note: This accounts for all organisations which use Slack, many of which do not pay for it 

Sources: Slack, Fast CompanyThe Verge

Slack valuation

2014$1.1 billion
2015$2.8 billion
2016$3.8 billion
2017$5 billion
2018$7.1 billion
2019$23 billion
2020$17 billion

Note: Salesforce acquired Slack for $27.7 billion in December 2020, a $10 billion premium on its market cap 

Sources: VentureBeatTechCrunchFT

Slack funding (total)

2011$15 million
2014$164 million
2015$283 million
2016$491 million
2017$904 million
2018$1384 million

Source: Crunchbase

Slack FAQ

How many Fortune 100 companies use Slack?

According to Slack, 65 of the Fortune 100 use Slack in some capacity

Which are some of the largest organisations using Slack

IBM, Amazon, PayPal and Airbnb all use Slack

How active is the average Slack user?

Users are active for 90 minutes per day on weekdays, according to Slack in 2019

How much does Slack reduce email?

According to Slack, using the app reduces emails by 32 percent and meetings by 27 percent

How many messages are sent on Slack per week?

1.5 billion messages are sent on the service every week

How many developers are registered on Slack?

Over 500,000 developers use Slack

How many apps are built for Slack

There are 2,000 apps and 750 bots available in the Slack App Directory

Source: https://www.businessofapps.com/

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