Verdict up front: Slack for any team that uses Jira, Salesforce, HubSpot, or needs SOC 2/HIPAA compliance. Discord for engineering-heavy teams under 30 people who care about voice channels and don't need enterprise integrations. The "Discord is free" advantage disappears at 50+ users once you factor in integration limitations.
The pricing math
At 20 users:
- Slack Free: €0 (90-day message history)
- Slack Pro: €7.25/user/month = €1,740/year
- Slack Business+: €12.50/user/month = €3,000/year
- Discord (no Nitro): €0
- Discord + Nitro for 5 users (uploads matter for designers): ~€600/year
At 100 users:
- Slack Pro: €725/month = €8,700/year
- Slack Business+: €1,250/month = €15,000/year
- Discord Business (per-user pricing): ~€7-12/user/month = €8,400-€14,400/year
At enterprise scale, pricing converges. The "Discord is free" line only holds for small teams.
Message search history
The single largest reason teams pay for Slack: the free tier only keeps 90 days of messages. After that, history is hidden until you upgrade. For an active team, you hit this limit in 2-3 months.
Discord's free tier has unlimited message history. No "upgrade to see your old messages" pressure. This is genuinely valuable — Slack's hidden message history is a forced-upgrade pattern that costs teams more than the feature warrants.
Voice and video
Discord voice channels are persistent rooms — you join one and stay there, others can drop in. This works beautifully for engineering teams that "co-work" in a voice room. Slack Huddles got close (2021) but the UX is more "start a call" than "join the room" — different culture.
Video calls:
- Slack Huddles: Up to 50 participants, screen share, video
- Discord: Up to 25 video participants (Stage Channels up to 1k for events)
Both lose to Google Meet / Zoom for scheduled meetings. Both win for quick "jump on a call" moments.
Thread model
Slack threads are the gold standard for async team chat. Each message can spawn a sub-conversation, replies stay scoped, the parent channel stays clean. Discord added threads in 2022 but the UX is awkward — threads feel like a separate "place" you navigate to, not a natural conversation branch.
For engineering teams that need async-first communication (reviewing PRs, discussing incidents, debating architecture), Slack's thread model wins by a lot.
Integration depth
Slack App Directory: 2,400+ apps. The "big four" (Jira, GitHub, Salesforce, HubSpot) all have first-party integrations with full bidirectional sync. Slack Workflow Builder lets non-developers build internal automations without code.
Discord: ~500 verified bots. Strong for custom bots (discord.js, discord.py are mature SDKs). Weak for enterprise integrations — Jira via Discord works via webhook + cobbled-together bots, not a first-party integration.
If you live in Jira/Salesforce/HubSpot, this is the decision. Slack saves 5-10 hours/week of context-switching across a 20-person team.
Compliance
- Slack Enterprise Grid: SOC 2 Type II, ISO 27001, HIPAA (BAA), GDPR DPA, FedRAMP Moderate (Slack GovCloud)
- Slack Business+: SOC 2, ISO 27001, HIPAA
- Slack Pro: SOC 2 Type II
- Discord Business: SOC 2 Type II, GDPR DPA
- Discord Free / Nitro: No formal compliance certifications
For regulated industries (healthcare, finance, government contracting): Slack. For everyone else: this doesn't matter.
Side-by-side
| Feature | Slack | Discord |
|---|---|---|
| Free tier message history | 90 days | Unlimited |
| Entry paid tier | €7.25/user/month (Pro) | €9.99/month flat (Nitro) |
| Threads | Best-in-class | Functional but awkward |
| Voice channels | Huddles (call-style) | Persistent rooms |
| Video call cap | 50 (Huddles) | 25 (Stage Channels: 1k) |
| Third-party integrations | 2,400+ apps | ~500 bots |
| Jira integration | First-party, bidirectional | Webhook-only |
| Workflow Builder | Yes (no-code) | No |
| Custom bot SDK | Bolt (Python/Node) | discord.js / discord.py |
| File upload (free) | 5MB | 25MB |
| File upload (paid) | 1GB (Pro) | 500MB (Nitro) |
| SOC 2 / ISO 27001 | All paid tiers | Discord Business |
| HIPAA / FedRAMP | Enterprise Grid | No |
| SAML SSO | Business+ (€12.50/user) | Business tier |
When to choose Slack
- You use Jira, Salesforce, HubSpot, or any major SaaS — integration depth matters
- Async-first culture (lots of threads, write-it-down norms)
- Regulated industry (healthcare, finance, government)
- 50+ users where pricing converges anyway
- You want Workflow Builder for no-code automations
When to choose Discord
- Engineering-heavy team under 30 people
- Persistent voice rooms are part of your culture
- Community-facing (devrel, open source projects, gaming)
- You don't need enterprise integrations
- Budget is genuinely a constraint and you're not regulated
The migration question
Most teams don't migrate from Slack to Discord — once threads, integrations, and search history are in Slack, leaving is painful. Discord → Slack is more common as teams scale past 30 and need integrations. Plan 2-4 weeks for archive export + history migration + integration rebuild.
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