Slack Statistics 2026: Users, Revenue, Customers and Slackbot

Slackbot reached one million active users five months after launch, up 150% quarter-to-quarter, according to Salesforce’s second quarter fiscal 2027 earnings call. Slack also delivered its fastest quarterly Net New Annual Order Value growth since the acquisition. Salesforce no longer reports Slack revenue or user counts on their own, so the hardest Slack statistics still come from its 2021 SEC filings.

Those filings, Slack’s last annual report to the SEC, show total revenue of $902.6 million in fiscal 2021, up 43% year over year, and 156,000 paid customers as of January 31, 2021. The figures below pair those filings, whose annual revenue is audited, with Salesforce’s 2026 earnings disclosures, Slack’s product pages and the Slack Workforce Index, each dated to its source.

Key Takeaways

• Slackbot hit one million active users five months after launch, growing 150% quarter-to-quarter.
• 1,183 paid customers above $100,000 in annual recurring revenue accounted for approximately 49% of Slack’s revenue in fiscal year 2021.
• Net dollar retention fell from 143% in fiscal 2019 to 123% in fiscal 2021, and it stood at 122% in the first quarter of fiscal 2022.
• Non-US revenue rose from 36% of total revenue in fiscal 2019 to 39% in fiscal 2021.
• Slack passed 10 million daily active users in early 2019, and more than half of those users were outside the United States, in 150-plus countries.
• Slack’s last reported quarter as a public company brought in $273.4 million, up 36% year over year.

Editor’s Choice

• Fiscal 2021 revenue: $902.6 million, with Calculated Billings of $1,036.5 million.
• Paid customers: over 169,000 in the quarter ended April 30, 2021, up 39% year over year.
• Large customers: 113 paid customers above $1 million in annual recurring revenue in the quarter ended April 30, 2021.
• Acquisition value: an enterprise value of approximately $27.7 billion.
• Agentic Work Units: 7.0 billion delivered to date across Agentforce and Slack.
• App Directory: over 2,600 apps in the Slack App Directory.

Slack Statistics at a Glance

• Salesforce’s chief executive told analysts he thinks there are more than a million companies on Slack now, a spoken estimate rather than a reported metric.
• Slackbot users grew over 150% quarter over quarter in Q2 FY27, the quarter that ended on July 31, 2026.
• Slackbot has crossed one million monthly active users, up 145% quarter over quarter, in Slack’s own Dreamforce count.
• Tens of millions of people already run the Slack desktop app, Salesforce says on its Slackbot product page.
• As of January 31, 2021, Slack had more than 756,000 organizations with three or more users.
• Salesforce reported revenue of $11.3 billion for Q2 FY27, up 11% Y/Y, and the Salesforce revenue and customer data show how Slack fits inside that total.

Source: Salesforce 2026, Slack 2026, Slack Technologies 2021

About This Data

Compiled from 16 documents: 9 Salesforce releases, call transcripts and product pages, 4 Slack pages, 2 Slack Technologies SEC filings and 1 Microsoft earnings call, published between 2019 and 2026-09. Only company-published or filed figures qualify. Figures are reviewed on a rolling basis and updated when Salesforce or Slack publishes new numbers.

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Slack Revenue by Fiscal Year

• Total revenue was $902.6 million in fiscal 2021, the peak year in the chart below, up from $105.153 million in fiscal 2017.
• Revenue rose about 8.58 times across those four years.
• Gross profit reached $780.918 million in fiscal 2021.
• In the quarter ended April 30, 2021, total revenue was $273.4 million, an increase of 36% year over year.
• Calculated Billings rose 35% to $1,036.5 million in fiscal 2021.

By the numbers: Slack’s fiscal 2021 revenue of $902.6 million rose 43% year over year, and paid customers grew 42% to 156,000. Both figures come from Slack’s fiscal 2021 Form 10-K, covering the year ended January 31, 2021, and they anchor the revenue and customer charts on this page.

Recent Developments

• September 2026: Slack’s Dreamforce 2026 announcement brought Slackbot into channels and Salesforce, turning conversations into a single AI-powered interface for work.
• September 2026: Slack introduced Slackforce Surfaces, which turn data from Salesforce and beyond into interactive experiences inside Slack.
• August 26, 2026: Salesforce reported that Slack delivered its fastest quarterly NNAOV growth since acquisition as Slackbot users grew over 150% Q/Q.
• August 26, 2026: On the earnings call, Salesforce said Agentforce sales, service, and Slack seats all saw year-over-year growth.
• August 2026: Slack launched Slack Code, where code channels let teams and agents write, review, and ship code together.
• August 2026: Slackbot gained an MCP client that connects every app a team uses through Slackbot.

Slack Paid Customers

• Slack counted 88,000 paid customers in fiscal 2019, 110,000 in fiscal 2020 and 156,000 in fiscal 2021, with fiscal 2021 the high point in the chart.
• Slack counts an organization as a Paid Customer once it has three or more users on a paid plan, and rounds the total down to the nearest thousand.
• Slack added over 13,000 net new Paid Customers in the first quarter of fiscal 2022, for a total of 169,000.
• More than 600,000 organizations with three or more users were on the Free plan as of January 31, 2021.
• No Paid Customer accounted for more than 3% of revenue in fiscal years 2019, 2020, or 2021.

Slack Large Customers and Net Dollar Retention

• Paid customers above $100,000 in annual recurring revenue rose from 575 in fiscal 2019 to 893 in fiscal 2020 and 1,183 in fiscal 2021.
• That count reached 1,285 in the first quarter of fiscal 2022, up 33% year over year, the latest point in the chart below.
• Those 1,183 large customers accounted for approximately 49% of revenue in fiscal year 2021.
• Slack’s largest Paid Customers had more than one hundred thousand employees using Slack on a regular basis.

Large accounts kept growing in number, while net dollar retention across all Paid Customers eased each year.

• Net dollar retention was 143% in fiscal 2019, 132% in fiscal 2020, and 123% in fiscal 2021.
• Slack reported a 122% net dollar retention rate for the first quarter of fiscal 2022.

Key finding: Slack’s 1,183 customers paying more than $100,000 a year generated approximately 49% of its fiscal 2021 revenue. As net dollar retention eased from 143% in fiscal 2019 toward 122% in early fiscal 2022, existing accounts kept expanding but at a slower rate.

Slack Daily Active Users and Global Reach

• Slack reported more than 10 million daily active users around the world as its fifth birthday approached.
• More than half of Slack’s daily active users were outside of the United States, in 150-plus countries.
• Non-US revenue made up 39% of total revenue in fiscal 2021, 37% in fiscal 2020 and 36% in fiscal 2019, with fiscal 2021 the highest share.
• Paid customers had grown by more than 50% over the prior year to top 85,000 at the time of the 10 million milestone.

Slack Connect and Fortune 100 Adoption

• Slack Connect is used by more than 100,000 organizations, including 77 of the Fortune 100 companies.
• Over 91,000 Paid Customers used Slack Connect in the first quarter of fiscal 2022, up from over 74,000 at the end of the prior quarter.
• Slack Connect had over 950,000 connected endpoints, up over 265% year over year.

Source: Slack 2019, Slack Connect page, Slack Technologies 2021

Slackbot and Agentic Work Units

• Salesforce counted 7.0 billion Agentic Work Units delivered to date across Agentforce and Slack, with 3.2 billion in Q2, growing 97% quarter-over-quarter.
• AWUs delivered to date stood at 3.8 billion in the prior quarter, and Salesforce put quarterly AWU growth at 111% quarter-over-quarter.
• Salesforce first reported 2.4 billion AWUs delivered to date across Agentforce and Slack in its fourth quarter of fiscal 2026.
• Slack’s Model Context Protocol server surpassed 1 million active users within six weeks of launch.
• AI-enabled apps built for Slack have grown 690% year over year.
• Customers like Anthropic, Wayfair and reMarkable are using Slackbot, with some employees reporting saving up to 90 minutes a day.

Slackbot is powered by Claude and is included in Slack Business+ and Enterprise+ plans. Slackbot adoption is also a read on Claude usage inside workplace tools.

Why it matters: Effective Q2 FY27, Salesforce’s Agentforce ARR includes its AI offerings, Slackbot and Headless 360. Slackbot revenue now sits inside an AI line rather than a Slack line, so the Agentic Work Unit count and Slackbot user totals are the closest public measures of Slack’s AI traction.

Slack Workforce Index: AI Use Among Desk Workers

• Since November 2024, AI adoption among workers has risen 50%, with 60% of workers now using AI, the largest share in the chart below.
• 40% of workers have worked with an agent, and 23% have offloaded tasks to agents to complete on their behalf.
• Daily AI usage was higher by 233% in just six months, in a survey of 5,000 global desk workers.
• 96% of AI users have used AI to perform tasks they didn’t have the skills to do themselves.
• 30% of Millennials say they thoroughly understand AI agents, edging out Gen Z at 22%.

Daily use rises with seniority in the same survey.

• 43% of executives report daily AI use, compared to 35% of senior managers and 23% of middle managers.
• Broader AI usage statistics track adoption beyond this survey’s desk-worker base.

Slack Pricing Plans

• Pro costs $7.25 per user per month when paying annually, with the higher monthly-billing rate shown in the table.
• Business+ costs $15 per user per month when paying annually, and its monthly-billing rate is the highest listed price in the chart.
• Free plan messages are saved and searchable for 90 days, with up to 10 apps.
• Enterprise+ requires contacting sales for pricing.

Slack vs Microsoft Teams

• Microsoft reported more than 320 million monthly active users for Teams on its fiscal 2024 first quarter earnings call.
• Slack reported more than 10 million daily active users in early 2019, a different metric from monthly users.
• Salesforce said nine out of the top 10 AI companies in the world use Salesforce and Slack.
• Neither company publishes a team messaging market share figure. The Slack vs Microsoft Teams comparison covers features and pricing.

Source: Microsoft 2023, Slack 2019, Salesforce 2026

A monthly count and a daily count are not comparable, so read the Microsoft Teams user statistics alongside these figures, not as a ratio.

Slack Acquisition and Employee Count

• The deal represented an enterprise value of approximately $27.7 billion, based on the closing price of Salesforce’s common stock on November 30, 2020.
• Salesforce completed its acquisition of Slack Technologies on July 21, 2021.
• Slack had 2,545 full-time employees as of January 31, 2021.
• In June 2020, Slack said it would allow many employees to work remotely on a permanent basis, an early move in the remote work shift.

Source: Salesforce 2020 and 2021, Slack Technologies Form 10-K 2021

How many people use Slack?

Tens of millions of people already run the Slack desktop app, according to Salesforce. Salesforce’s chief executive said he thinks more than a million companies are on Slack, while Slack reported more than 10 million daily active users in early 2019.

When did Slack gain popularity?

Slack passed 10 million daily active users and 85,000 paid customers as its fifth birthday approached. Revenue then more than doubled in two years, from $400.552 million in fiscal 2019 to $902.6 million in fiscal 2021, an increase of 43% year-over-year in that final year.

Does Slack have a project management tool?

Slack offers Workflow Builder for business users and ops teams, and agents connected through Slack’s MCP Server can search, create, and update Lists. Lists, workflows, and canvases give Slack basic project tracking, though it does not position itself as a dedicated project management suite.

Conclusion

Slackbot’s one million active users, up 150% quarter-to-quarter, now carry the Slack story that $902.6 million in fiscal 2021 revenue once told. The filed baseline is five years old, and Salesforce reports Slack through AI usage, seat growth, and order growth instead.