StackCurated composite score
80.2 / 100
Effectiveness · 30%
81 / 100
Core reliability, feature execution, error resilience and edge case handling.
System latency, UI speed, API completeness, webhooks and resource consumption.
Time to first value, navigation ergonomics and documentation quality.
Time-Saved ROI · 20%
77 / 100
Workflow acceleration, automation depth and manual hours eliminated each week.
Slack is scored with the same weighted formula as every other tool on the site. See how we test.
The StackCurated Verdict
Slack scores 80.2 out of 100 on our weighted engine, with its highest pillar in efficiency at 85 and its lowest in usability at 77. On our modelling it returns roughly 1.2 hours per user per week, about 58 hours a year per seat, and offsets around $20 a month ($240 a year) of tooling or labour it replaces. Buy it if the job you need done is "channel-based communication and system alerts" and you will actually use it daily. We earn nothing if you adopt this one.
Who Should NOT Buy This
Skip Slack if you are teams that have not agreed on the process this tool is supposed to run — software does not settle an internal disagreement about who owns the workflow. Its weakest pillar is usability (77/100: time to first value, navigation ergonomics and documentation quality.), so if that is the exact dimension you are buying for, look elsewhere first. It rewards consistent use, not occasional use.
Community consensus
Aggregated operator sentiment tracks our score band: users consistently praise efficiency and describe less internal email, faster decisions as the reason they keep it. The recurring complaint clusters around usability and around onboarding a full team rather than a single power user. We synthesise this from public reviews, forum threads and vendor documentation, and we re-score when the pattern shifts.
Slack was supposed to reduce email.
It did.
Then people discovered they could send each other messages constantly all day instead.
Slack is excellent for quick communication, team channels, integrations, client collaboration, and getting information where it needs to go quickly.
It is also extremely good at interrupting people.
The difference between useful Slack and chaotic Slack is usually company culture. If every message is treated as urgent, nobody gets enough uninterrupted time to do serious work.
Pros
Fast communication. Useful integrations. Excellent for teams and shared channels.
Cons
Notification overload can destroy concentration.
My take
Great communication infrastructure with sensible rules. Absolute chaos without them.
Direct link
Visit Slack