4 researched picks · 3 with a free tier · Last reviewed 2026-09-18
Research method: official pricing/feature pages checked against the comparison criteria below. No hands-on lab testing is claimed.
Best slack alternatives: Discord — Free voice-first community chat. It is also fully free. Runner-up free pick: Microsoft Teams. Compare all 4 below.
Slack's per-seat pricing and 90-day message history on free plans push teams elsewhere: Discord for communities, Teams for Microsoft shops, Mattermost for self-hosted control, and Twist for calmer async threads. The deciding question is sync versus async — chat-first or threads-first.
All listed options are researched picks with genuine free tiers where flagged, and paid placements — when they exist — are always labeled Sponsored and never buy a ranking position. Trial with your actual channels and history needs; migration pain lives in search history and integrations, not chat bubbles.
| Tool | Price | Free tier | Best for |
|---|---|---|---|
| 🎧Discord | Free | Communities and gaming-adjacent teams | |
| 👥Microsoft Teams | Free tier | Microsoft-centric organizations | |
| 🔧Mattermost | Free self-hosted | Regulated or privacy-first engineering orgs | |
| 🧘Twist | From $6/user/mo | Remote teams fighting chat fatigue |
No numeric scores are shown — there is no disclosed reproducible scoring system. Order reflects editorial comparison on the criteria above; sponsored rows are highlighted but payment never buys position.
Free voice-first community chat.
Pros
Cons
Best for: Communities and gaming-adjacent teams · Price: Free
Chat plus meetings inside Microsoft 365.
Pros
Cons
Best for: Microsoft-centric organizations · Price: Free tier
Open-source Slack-compatible chat, self-hosted.
Pros
Cons
Best for: Regulated or privacy-first engineering orgs · Price: Free self-hosted
Async-first threads instead of live chat.
Pros
Cons
Best for: Remote teams fighting chat fatigue · Price: From $6/user/mo
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