The team messaging standard — essential infrastructure, expensive at enterprise scale
TL;DR: Slack carries a Risk Score of 54/100 (Caution) based on 3 documented complaints — a non-trivial pattern of issues worth reading before you sign up.
Slack is the leading team messaging and collaboration platform, acquired by Salesforce in 2021 for $27.7 billion. Pricing includes a free tier (90-day message history), Pro at $7.25/user/month, Business+ at $12.50/user/month, and Enterprise Grid at custom pricing.
Slack fundamentally changed how modern teams communicate and the product quality is real — threading, integration ecosystem, and search are best-in-class. For organizations where Slack is the connective tissue between tools, it's nearly impossible to replace.
The primary complaints: Microsoft Teams is included in M365 (which most enterprises already pay for), creating constant 'why are we paying for Slack?' budget conversations. The 2024 controversy over Slack's opt-out (rather than opt-in) policy for using message data to train AI models generated significant privacy concern — many organizations discovered they had never opted out.
Each complaint type is weighted differently in the Risk Score. Billing and marketing deception weigh heaviest.
Complaints are sourced from public platforms spanning US, UK, and global consumers. Each report links back to its original source.
| Platform | Reports | Who's reporting |
|---|---|---|
| 2 | US & global users | |
| TechCrunch | 1 | Various regions |
Documented pricing complaints, billing issues, and support failures — newest first.
Our AI scanner searches Reddit, Trustpilot, BBB, and news sources for fresh complaints from the past year, paraphrases what it finds, and adds anything new to this page. Takes up to 90 seconds.
In 2024, Slack's privacy policy allowed the company to use customer message data for training AI models, with opt-out requiring a specific email request rather than an in-product toggle. Many organizations were unaware they had never opted out. After public backlash, Slack updated the process.
Enterprise IT departments universally compare Slack's per-user cost against Microsoft Teams, which is included in Microsoft 365 subscriptions most enterprises already pay. The cost comparison frequently drives Teams adoption for budget-sensitive organizations.
Organizations on the free tier who exceed 90 days discover that message history before that window is inaccessible. Teams that use Slack as a de facto knowledge base face real information loss when old messages become unreachable.
We've documented 2 billing complaints against Slack — a signal worth weighing before committing to a paid plan. Its Risk Score of 54/100 puts it in the "Caution" band. See the full complaints breakdown → before deciding.
Cancellation difficulty is one of the top SaaS frustration patterns. Check the complaints page → — we tag cancel-related issues under "Billing" and "Contract Trap" categories. If none are documented yet, run a scan to surface what's currently out there.
Hidden-fee complaints fall under our "Billing Issue" category. We've documented 2 billing complaints for Slack so far. See all complaints → for the full picture.
We track other project management & collaboration tools and rank them by Risk Score. See our alternatives comparison → to find lower-risk options in the same category.
The highest-severity documented complaints involve misleading marketing. Read all 3 documented complaints on the complaints page →
Probably not in the strict legal sense — most SaaS products with bad reputations are real companies delivering a real (if disappointing) product. But "is it a scam" is the question people ask when they feel they were misled. Read our full scam analysis →
We weight each warning by severity (Low to Critical) and category, then aggregate. Lawsuits and misleading-marketing claims weigh heaviest. The current 54/100 score puts Slack in the "Caution" band. Full methodology →
Each warning is paraphrased from a public source — BBB filings, Trustpilot or G2 reviews, Reddit threads, Capterra ratings, court records, or news articles. The source URL is attached to every warning so you can verify it yourself. More on our methodology →
Sibling products in the same category, ranked by Risk Score (lowest first).
Kanban classic, now Atlassian-owned and quietly underinvested
Opinionated PM tool from 37signals with controversial leadership
Beloved docs-and-databases tool with growing pricing complaints
Project management platform with mid-market sticker-shock complaints
The engineering-first project tracker — fast, opinionated, increasingly loved
Visual collaboration and digital whiteboard — great product, increasingly expensive per seat