8 Best Slack Alternatives in 2026 (After the Price Hikes)
Slack still works fine — the reasons to leave in 2026 are mostly about the bill and the ownership. After Salesforce’s June 2025 pricing and packaging change, the Business+ plan rose from $12.50 to $15 per user per month, a new Enterprise+ tier appeared, and the whole product got reoriented around Agentforce AI agents (add-ons that start at $125 per user per month). Meanwhile the free plan still hides message history after 90 days — forgivable in 2015, genuinely limiting now. If you’re a small team watching per-seat costs compound with every hire, or you want your conversations on infrastructure you control, here are the eight Slack alternatives worth a real look.
If your reason for leaving is that you want Slack to do more — triage the channel, chase the follow-up, book the meeting — that’s a different problem than switching apps. An AI executive assistant like Carly works inside your existing Slack rather than replacing it, so the picks below are about the chat platform itself.
1. Microsoft Teams
The default landing spot for any company already paying for Microsoft 365, where Teams is bundled at no extra cost.
What makes it different from Slack: Teams folds chat, video meetings, and file storage into one app that’s already licensed for most office workers, so the marginal cost of switching is often zero. Standalone Teams Essentials runs about $4/user/month (rising to $4.50 after July 2026), well under Slack’s paid tiers. The trade-off is a heavier, busier interface and tighter coupling to the Microsoft stack. See the full Slack vs. Teams breakdown.
Best for: Organizations already on Microsoft 365 that want to stop paying for Slack separately.
Pricing: Included with Microsoft 365; standalone Essentials ~$4/user/month.
2. Discord
The community-first chat platform that quietly became a serious home for teams, creators, and open-source projects.
What makes it different from Slack: Discord is free for effectively unlimited history and members, with persistent voice channels you can drop into instead of scheduling a call. It was built for communities rather than companies, so it lacks Slack’s compliance and admin polish — but for startups, side projects, and public-facing groups, the price (free, with optional ~$9.99/month Nitro perks) is hard to argue with. Compare the two directly in Slack vs. Discord.
Best for: Communities, creators, and lean teams that want free voice-first chat.
Pricing: Free; Nitro from ~$9.99/month for cosmetic and upload perks.
3. Mattermost
An open-source, self-hostable messaging platform aimed at security-conscious and regulated teams.
What makes it different from Slack: Mattermost’s Team Edition is free to self-host with no per-user fee and no message-history cap, so your data lives on your own servers instead of Salesforce’s. It’s popular with developers and defense, finance, and government orgs that can’t send conversations to a third-party cloud. You trade Slack’s zero-setup convenience for running your own infrastructure.
Best for: Engineering and regulated teams that need data sovereignty and uncapped history.
Pricing: Free self-hosted (Team Edition); paid Professional tier from about $10/user/month.
4. Pumble
A genuinely free Slack clone with the one thing Slack’s free plan refuses to offer: unlimited message history.
What makes it different from Slack: Pumble gives you unlimited users, unlimited searchable history, channels, threads, DMs, and voice/video with screen sharing — all on the free tier. Where Slack’s free plan is a 90-day trial in disguise, Pumble is usable as a permanent HQ without paying. Paid plans add admin controls and longer video-call recording.
Best for: Budget-conscious teams that want a full Slack-style experience for $0.
Pricing: Free (unlimited users and history); paid tiers add admin and retention controls.
5. Zulip
An open-source chat app built around topic-threaded conversations rather than a firehose of channels.
What makes it different from Slack: Every message in Zulip lives under a named topic inside a channel, which makes it far easier to follow multiple discussions asynchronously and catch up after time away — a model remote and distributed teams tend to love once they adjust. It’s free to self-host, or $6.67/user/month on Zulip Cloud, and there’s a free cloud tier for small teams.
Best for: Async and remote teams that want organized, catch-up-friendly threading.
Pricing: Free self-hosted; Cloud Standard $6.67/user/month (free cloud tier available).
6. Twist
Made by Doist (the Todoist company), Twist is deliberately built to kill the always-on pressure of real-time chat.
What makes it different from Slack: Twist organizes everything into threads and inbox-style channels and downplays presence, typing indicators, and instant-reply expectations on purpose. The pitch is calmer, more thoughtful communication for teams that don’t want Slack’s interrupt-driven culture. The free plan covers unlimited users but only one month of history; the Unlimited plan is $6/user/month.
Best for: Remote-first teams that want async-by-default communication.
Pricing: Free (1-month history); Unlimited $6/user/month.
7. Element
A secure, end-to-end-encrypted messenger built on the open Matrix protocol, trusted by dozens of governments.
What makes it different from Slack: Element encrypts messages, voice, and video by default and runs on federated Matrix infrastructure, so no single vendor owns your network — you can self-host or use Element’s hosted service. It’s the go-to when data sovereignty and encryption are non-negotiable, at the cost of a steeper learning curve than Slack. Business is $5/user/month; Enterprise $10.
Best for: Security- and sovereignty-focused teams that need E2E encryption and federation.
Pricing: Free self-hosted/community; Business $5/user/month, Enterprise $10/user/month.
8. Rocket.Chat
Another open-source, self-hostable platform, with a strong tilt toward customer-facing and omnichannel use.
What makes it different from Slack: Rocket.Chat combines internal team chat with customer messaging — livechat widgets, WhatsApp, email, and social channels routed into the same workspace. Its Starter tier is free to self-host for small teams, making it one of the easiest open-source Slack-alikes to stand up, and paid plans start around $2/user/month billed annually.
Best for: Teams that want internal chat and customer support in one self-hosted app.
Pricing: Free self-hosted Starter (small teams); paid from ~$2/user/month annually.
Whichever team chat you land on, Carly can hook right in — native integrations for Slack, Microsoft Teams, Discord, and Telegram, plus bring-your-own API key for anything else.
Slack Alternatives Compared
| Tool | Model | Best for | Self-host? | Starting price |
|---|---|---|---|---|
| Microsoft Teams | Bundled suite chat | M365 orgs | No | Included / ~$4/user/mo |
| Discord | Community voice-first | Communities, creators | No | Free |
| Mattermost | Open-source secure | Regulated / dev teams | Yes | Free self-hosted |
| Pumble | Free Slack clone | Budget teams | No | Free |
| Zulip | Topic-threaded async | Remote / async teams | Yes | Free self-hosted |
| Twist | Async-by-default | Remote-first teams | No | Free (1-mo history) |
| Element | E2E-encrypted Matrix | Security / sovereignty | Yes | $5/user/mo |
| Rocket.Chat | Chat + customer support | Support-facing teams | Yes | Free self-hosted |
| Slack | Real-time channels | Salesforce-stack orgs | No | $7.25/user/mo (Pro) |
FAQ
Why are people leaving Slack in 2026? Mostly cost and lock-in. Salesforce’s June 2025 restructure pushed Business+ to $15/user/month and reoriented Slack around paid Agentforce AI agents, while the free plan still caps searchable history at 90 days. Teams watching per-seat costs or wanting data control are the ones shopping around.
What’s the best free Slack alternative? Pumble for a hosted, no-setup option — unlimited users and unlimited history at $0. If you can self-host, Mattermost Team Edition and Zulip both run free with no message cap.
What’s the closest self-hosted replacement for Slack? Mattermost is the most direct match: a Slack-like interface you run on your own servers with no per-user fee on the Team Edition. Rocket.Chat and Zulip are strong open-source options too, and Element/Matrix adds end-to-end encryption.
Do I have to leave Slack to get AI help in it? No. If the goal is having something triage channels, chase follow-ups, and book meetings, an AI executive assistant can connect to Slack and act inside it — separate from the question of which chat platform you run.
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"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
