What Slack is genuinely great at
Real-time communication at organisational scale, with the best integration ecosystem in software. If something happens in another tool, Slack can tell you about it. For distributed teams that need to move fast together, it replaced internal email for good reason.
The thing to know before you commit
On the free plan, messages drop out of search and scrollback after 90 days, and anything older than a year is permanently deleted from a free workspace. That single limit is reportedly what drives most upgrades to a paid seat — which is a reasonable business model, but you should know it's the hook before you put three years of decisions in there.
For contrast, Microsoft Teams' free tier has no message history cap at all. If free history is your deciding factor, that's a genuine point for Teams.
The deeper structural issue
Slack's value to Slack goes up the longer you stay logged in. That isn't a conspiracy, it's just what the product is for — so every feature has to serve presence, and presence is expensive. Roughly one in five workers now switch between tabs and apps more than a hundred times a day, and it takes around nine and a half minutes to get back into a productive workflow after each toggle.
How Fuidzy is different
Our shared spaces have no channels, no threads and no @here. A small group — a couple, a study group, a two-person company — shares a timeline. You see when people are busy without seeing what they're doing, unless they choose to show you. Each person picks their own visibility, and no role, including whoever created the space, can see past what someone chose.
The only thing that ever speaks is the bunny, and it only speaks when something is actually due. The group's streak goes up on days everybody finished and left.
Use Slack if you have a real company with real cross-team coordination. It's genuinely the right tool and we're not built for that.
Use Fuidzy if "what is everyone working on, and when are we all free" is the actual question — and you'd like the answer without forty channels around it.