Discourse vs Slack
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Editorial assessmentSlack compared with Discourse
Opposite tools for opposite problems. Discourse is asynchronous, permanent, indexed by Google, and has the best moderation and spam tooling in this category. Slack is real time, ephemeral on the free plan, and invisible to search. A common and sensible pattern is Slack for live conversation and Discourse for the answers that should be findable in two years, which is exactly the gap Slack's history limit creates.
Choose Discourse if
Software companies, open-source projects, and public-interest organizations running a free, large, public discussion forum where search indexing, permanent archives, and community self-moderation matter more than paid memberships, and teams that want the option to self-host the whole thing for nothing.
Choose Slack if
Professional and industry communities under a couple of hundred members whose value is live conversation and access rather than an accumulating archive, especially where members are software or business people who already live in Slack all day and will not install anything new.
Side by side
13 attributes| Attribute | Discourse | Slack |
|---|---|---|
| Category | Community | Community |
| Starting price | $0 (self-hosted, or the free managed plan), then $100 per month for Pro managed hosting (free plan available) | $0 (Free), then $8.75 per user per month (Pro), or $7.25 billed annually (free plan available) |
| Pricing model | Open-source software that is free to self-host, plus optional managed hosting sold in flat monthly plans tiered by staff seats, page views, storage, and plugin access. No transaction fees, because there is no payments layer. | Per user per month subscription designed for employees, with a permanently free tier limited by message history and app count. There is no community pricing, no member tier, and no commerce layer. |
| Free plan | A genuinely free managed plan with unlimited members and chat, 10 categories, 5GB storage, 500,000 monthly page views, 20,000 emails, 2 staff seats, 100,000 daily AI credits, and community-only support. | Unlimited members and channels, but only 90 days of visible message history, a maximum of ten apps, one to one huddles, and one to one external messaging through Slack Connect. |
| Free trial | Free trial on paid plans with no credit card required up front | The free plan serves as the evaluation path; paid plans are self serve |
| Best for | Software companies, open-source projects, and public-interest organizations running a free, large, public discussion forum where search indexing, permanent archives, and community self-moderation matter more than paid memberships, and teams that want the option to self-host the whole thing for nothing. | Professional and industry communities under a couple of hundred members whose value is live conversation and access rather than an accumulating archive, especially where members are software or business people who already live in Slack all day and will not install anything new. |
| Setup time | Managed hosting is live in minutes on the free plan with no credit card. Self-hosting takes a competent sysadmin an afternoon using the official Docker install. Getting the category structure, trust-level configuration, and onboarding right is a week or two of thought, not of work. | Minutes to a workspace, a day to a well organized one. The real work is deciding channel structure and writing an onboarding flow in Workflow Builder, because Slack gives new members no guidance by default. |
| Learning curve | Moderate for admins because Discourse is deep and exposes a great deal of configuration, and low to moderate for members, who need a short adjustment if they arrive from chat platforms. The trust-level system rewards understanding it properly and is the main thing worth studying before launch. | Effectively zero for professional members, who already use it daily. Moderate for operators only because Slack's admin tooling assumes an IT context rather than a community one, and much of what a community manager wants simply is not there. |
| Platforms | Web app, mobile-first responsive, iOS app, Android app, Self-hosted via Docker, Managed hosting with custom domain | macOS, Windows, Linux, iOS, Android, Web |
| Compliance | GDPR, Self-hosting available for organizations with strict data-control requirements | SOC 2, SOC 3, ISO 27001, GDPR, HIPAA support on higher tiers, FedRAMP on specific Enterprise offerings |
| Founded | 2013 | 2013 |
| Headquarters | Distributed, incorporated in the United States as Civilized Discourse Construction Kit, Inc. | San Francisco, California, United States |
| Ownership | Venture-backed, privately held | Owned by Salesforce |
Strengths and limitations
Discourse
Strengths
- A genuinely free managed plan with unlimited members and 500,000 monthly page views, which no other platform in this category offers.
- Fully open source, so self-hosting is always available and vendor lock-in is structurally impossible; you can leave with the entire application and database.
- The best SEO story here by a wide margin. Public topics are indexed, and for a software company a mature Discourse forum becomes a significant organic acquisition channel.
- Trust levels distribute moderation across the membership automatically, letting a very large community run on very few paid staff.
Limitations
- No payments layer at all: no checkout, no paid memberships, no course sales, no transaction fee. Creator businesses need a different product or a bolt-on billing tool.
- No course builder, so a community that sells education has to host that somewhere else and link to it.
- The mobile apps carry Discourse's branding and there is no branded-app programme at any price, which is a hard limit for anyone whose community must be part of their own product experience.
- SSO on managed hosting starts at the $500 Business plan, a fivefold price jump from Pro for what is often a single required capability.
Slack
Strengths
- Zero adoption friction with professional audiences. Software, product, and business people already have Slack open all day and will join a workspace without installing anything or learning anything.
- The best threading model in this category. Replies branch cleanly under a message instead of flooding a channel, which keeps a busy community readable in a way Discord struggles with.
- Search quality is genuinely good, with filters by person, channel, and date, and better than every free alternative here within the window it can see.
- Slack Connect on Pro shares channels with up to 250 external organizations, which is the strongest legitimate community use case Slack has for a B2B company.
Limitations
- The 90 day history limit on the free plan destroys the archive, which is the single largest source of long term community value, and Discord does not have this problem at the same price.
- Per member pricing makes upgrading impossible at community scale. A thousand members on Pro is $7,250 a month, or roughly eighty times Circle.
- No commerce layer whatsoever: no checkout, no memberships, no entitlement, so charging for access always means a third party invite tool bolted onto Stripe.
- No moderation queue, no spam classifier, and no equivalent of AutoMod. Slack assumes a workspace is full of colleagues.
Pricing compared
Discourse
Open-source software that is free to self-host, plus optional managed hosting sold in flat monthly plans tiered by staff seats, page views, storage, and plugin access. No transaction fees, because there is no payments layer.
- Free$0
- Pro$100
- Business$500
- EnterpriseCustom
Discourse is the best value in this category by a distance, provided you want what it does. The free managed plan gives unlimited members, chat, AI credits, and 500,000 monthly page views for nothing, and self-hosting gives you the entire application for the cost of a server. Pro at $100 a month is less than half of Circle Business and a quarter of Bettermode Starter while handling communities an order of magnitude larger. What you are not paying for, because it does not exist, is a checkout, a course builder, or a branded app. The one genuinely awkward step is SSO at $500, which is a lot to pay for one capability that self-hosting gives you free. If the community is public, free, and discussion-led, no competitor is close on price or capability.
Slack
Per user per month subscription designed for employees, with a permanently free tier limited by message history and app count. There is no community pricing, no member tier, and no commerce layer.
- Free$0
- Pro$8.75
- Business+$15
- Enterprise+Custom
Free Slack is worth using and paid Slack is not, at least not for a community. What the free plan gives you is genuine: unlimited members, unlimited channels, the best threading model in this category, strong search within its window, mature apps, a huge integration directory, and a professional audience who already have it open. What it takes away is the thing that makes a community compound. Ninety days of history means the archive never accumulates, and the members who answer the same question for the fourth time will eventually stop. Upgrading is not a fix but a different problem: at $7.25 per member per year Slack is charging you employee prices for people who are not employees, and a thousand member community would pay $87,000 a year for what Discord provides free and Circle provides for about $1,100. The correct read is that Slack is an acceptable free venue for a small professional community that trades on access rather than on archive, and a bad idea for anything else.
Editorial verdict on each
Discourse
Discourse is the correct answer more often than the market's attention suggests. If your community is public, free, discussion-led, and its content should be findable in Google, nothing here competes: the free managed tier gives you unlimited members and half a million page views for nothing, Pro at $100 handles communities far larger than most creator platforms ever see, trust levels do moderation work that would otherwise require staff, and the open-source licence means you can never be locked in or priced out. The limitations are equally clear and equally honest. There is no checkout, no course builder, no branded app, and SSO on managed hosting costs $500 a month. Buy it for a support forum, an open-source project, or a public commons, and pair it with a billing tool if you must charge. Do not buy it as a membership business, because it was never trying to be one.
Read the full Discourse profileSlack
Slack is where a great many professional communities live and almost none of them chose it. As a free venue for a few hundred senior people who already have it open, it is legitimately good: threading is the best in this category, search is strong, adoption friction is zero, and Slack Connect handles customer and partner channels better than anything else here. As a community platform it has two disqualifying flaws. The free plan hides everything older than 90 days, so the archive that makes a community valuable over time never accumulates, and Discord does the same job for free while keeping every message forever. And upgrading charges employee prices for people who are not employees: a thousand members on Pro is $7,250 a month, roughly eighty times what Circle costs to host the same community with permanent history, courses, events, and a checkout. There is no commerce layer at all, so charging for access means a third party invite tool bolted onto Stripe, with the fragility that implies. Use free Slack for a small professional group that trades on access. For anything that should still be useful in two years, move to Discord if you want free, Discourse if you want found, and Circle or Heartbeat if you want paid.
Read the full Slack profileDiscourse profile last reviewed 2026-08-22; Slack last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.