The short version
Both are built around channels, and both now put AI agents in the conversation. The difference is how far you have to trust that AI, and what happens when the team needs to talk rather than type.
Slack is the most mature team chat there is, with the largest app directory in the category and Slackbot as a personal AI agent on its higher plans. Slack commits that the models it uses run inside Slack's own cloud, that model providers don't get access to your data, and that your messages aren't used to train them. Those protections are commitments Slack makes about its own infrastructure.
HOLOH Workspaces gives you confidential AI agents. They run in hardware-isolated, attested environments, and every answer carries proof you can check. And when the team needs to talk, the call is a room, not a huddle, and it can happen in 3D.
AI at work: trust or verify
| Topic | HOLOH Workspaces | Slack |
|---|---|---|
| AI inside the chat | Agents you @mention in any channel; they answer in the thread | Slackbot and AI features in channels and DMs |
| Personal AI | A personal agent per member that answers only to them | Slackbot as a personal AI agent on Business+ and Enterprise+ |
| Shared team AI | Coworker agents, bound to their workspace by the platform | Agents from Slack and its partners |
| Where the AI runs | Confidential agents: hardware-isolated, remotely attested environments (AMD SEV-SNP) | Inside Slack's cloud |
| How protection is enforced | Hardware isolation, verified on every confidential answer | Slack's infrastructure and policies |
| Proof on each answer | Yes, attestation evidence on every confidential reply | No |
| If protection can't be verified | The agent stops; it never falls back to a standard model | — |
| Choice of AI models | Admins choose which models agents may use | Slack's choice |
In practice: with Slack, you rely on Slack's policies about where its models run. With HOLOH, you set up confidential agents for sensitive work, and every answer they give is verifiably processed in protected hardware.
Where the call lives
In Slack, a call is a huddle you start inside a conversation, and on the free plan a huddle is one-to-one. In HOLOH, the room is part of the product: every channel has its own room, so the next call starts where the last one did.
| Topic | HOLOH Workspaces | Slack |
|---|---|---|
| What a call is | A room that belongs to the channel | A huddle started inside a conversation |
| Meeting view | Classic grid, or a 3D room with one click | Huddle window |
| Move around and take a seat | Yes, in the 3D room | No |
| Whiteboard | Shared whiteboard inside the room | Canvas and huddle notes |
| Scheduled meetings on a shared calendar | Yes, in the same window | Through a connected calendar app |
| Guests from the browser | Yes, from the meeting link, with a lobby | Through Slack Connect or guest accounts |
When Slack is the right choice
If your workflow runs through integrations, you work with clients and partners in shared channels, or your day is mostly typing rather than talking, Slack is built for that. HOLOH is built for teams that talk as much as they type, and whose work is too sensitive for AI they can't verify.
What each one costs
| Topic | HOLOH Workspaces | Slack |
|---|---|---|
| Getting started | Free during early access | Free plan: 90 days of message history, up to 10 apps, 1:1 huddles |
| Entry paid plan | Not set yet | Pro at $7.25 per user per month paid annually, $8.75 paid monthly |
| With advanced AI | Included in early access | Business+ at $15 per user per month paid annually, $18 paid monthly |
| Top tier | Enterprise, custom | Enterprise+ at $45 per user per month, annual billing |
Slack prices are in US dollars, checked October 2026.