Slack scores 37/100 (Below expectations) on SINK's independent climate assessment — scored from public data only, no company payment can change a number. Last verified May 2026.
That places Slack joint 348th of 691 companies scored, and joint 37th of 58 in SaaS / Digital Services.
Slack has no independent sustainability reporting; all environmental data is buried in parent Salesforce's consolidated metrics. The company recently dropped absolute Scope 3 reduction targets in favor of intensity metrics—a hallmark greenwashing move. No Slack-specific emissions, waste, water, or nature data exists; renewable energy claims rest on market instruments, not additionality.
This score is built from public data only. If your practice is stronger than your disclosure, submit evidence for review — or challenge any question, free.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleStrongest on Energy Source and Carbon Footprint — Operations (6/10, 4/10). Weakest on Water Impact and Resource Use & Waste (3/10, 3/10).
10 sources used in this assessment. All publicly available. Each row shows which rubric questions it informed.
If you believe a source has been misread or a newer version exists, submit a challenge.
Where Slack sits among saas / digital services peers.
Among the 58 major saas / digital services brands we've scored, Slack is tied =37th of 58, with 4 others.
Score history begins 6 April 2026.
As Slack's score updates, the trajectory will appear here.
We're backfilling historical scores for FTSE 100 and S&P 100 companies over the coming weeks.
This score is not currently being contested.
Every challenge is published. We'd rather be corrected than wrong — that's the whole point.
No challenges submitted yet. If you have evidence that contradicts this score, you can challenge any question above — cite a public source and we'll review it.
Slack is a cloud-based workplace messaging and collaboration platform founded in 2009 and headquartered in San Francisco. Acquired by Salesforce in July 2021, it serves millions of users globally. As a SaaS business, Slack has minimal direct environmental impact but lacks independent sustainability disclosure and operates under its parent's consolidated reporting.
Parent company since July 2021; all Slack sustainability reporting consolidated under Salesforce's metrics and targets.
View breakdown →Comparable SaaS/cloud platform with independent sustainability disclosure and science-based targets; better transparency baseline.
View breakdown →Direct competitor in workplace collaboration; useful contrast in standalone reporting and target-setting practices.
View breakdown →Large tech SaaS provider with mature, disaggregated environmental reporting; highlights Slack's lack of subsidiary-level disclosure.
View breakdown →Email alerts when a rubric question is verified, a challenge is resolved, or the overall score changes.
One email, every Sunday. Score changes, new research, the stories behind the numbers. Free.
No spam. Unsubscribe in one click.
Checking a company?
Search free →Been scored?
See what's behind your number →Nobody can pay us to change a number.