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 date | 14 August 2013 |
| HQ | San Francisco, California |
| People | Stewart Butterfield (co-founder, CEO), Cal Henderson (co-founder, CTO) |
| Business type | Public |
| Industry | Business communication |
Slack revenue
| Year | 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
| Year | 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
| Year | Users |
| 2015 | 2 million |
| 2016 | 4 million |
| 2017 | 6 million |
| 2018 | 8 million |
| 2019 | 12 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 Company, The Verge
Slack paying customers
| Year | Paying customers |
| 2017 | 50,000 |
| 2018 | 60,000 |
| 2019 | 88,000 |
| 2020 | 112,000 |
| 2021 | 156,000 |
Source: Slack
Slack organisations
| Year | Organisations |
| 2014 | 30,000 |
| 2015 | 60,000 |
| 2016 | 1200,000 |
| 2017 | 330,000 |
| 2018 | 450,000 |
| 2019 | 640,000 |
| 2020 | 750,000 |
Note: This accounts for all organisations which use Slack, many of which do not pay for it
Sources: Slack, Fast Company, The 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: VentureBeat, TechCrunch, FT
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/