Discourse

YES

Replaceable in one session with an AI coding agent.

Open-source forum software with trust levels, moderation tooling and a reading experience built for long threads, hosted by them or on your own server.

Promptfree, for everyone, and the only version there is

Self-host it. Mail is the part that catches people out.

RUNNING IT
- The official Docker setup; do not improvise your own image
- It needs real memory. Two gigabytes is the practical floor

MAIL, BOTH DIRECTIONS
- Outbound through a transactional provider with SPF, DKIM and DMARC set
- Inbound for reply-by-email needs a dedicated address and a poller
- Getting notifications delivered is what makes a forum feel alive; a forum whose mail lands in spam dies quietly

BACKUPS
- Discourse has a built-in backup that includes uploads. Schedule it and copy off the machine

MODERATION
- Turn on trust levels from the start and set the new-user limits deliberately
- A forum with no rate limits for new accounts fills with spam within days

Include the install, the mail configuration and the backup schedule.

What you lose

Trust levels and moderation tools refined over a decade of real communities
A hosted instance with upgrades, backups and mail delivery configured
Mail-in and mail-out threading, which is fiddly to get right

If you would rather not build

GitHub Discussions, which is free

The escape hatch

open source · no votes, no paid placement

Discourse

The product itself, free to self-host with the official Docker setup.

discourse/discoursefree · open source

Flarum

A lighter forum that runs on ordinary PHP hosting.

flarum/frameworkfree · open source

Why this verdict

our own opinion · changed only by a person

80/100

Verdict yes at 80. The software is free and excellent; mail configuration and moderation settings are what decide whether the forum survives.

History

tracked since 10 Aug 2026 · nothing is ever overwritten

Interest · last 30 days

Nothing recorded yet. This chart fills in once the page has visitors, votes or prompt copies — it will not draw a flat line to look busy.

Questions about Discourse

answered from the record above

Is Discourse free?

No — the plan we track is $20 a month. Basic from around $20/month billed monthly on the hosted plan; the software is free to self-host.

Can you replace Discourse by building your own?

YES. Replaceable in one session with an AI coding agent. Replacement score 80 out of 100, build time one session. Read what you lose before you decide.

How much does Discourse cost?

$20 a month on Basic — $240 a year. Recorded 10 Aug 2026.

What do you lose by replacing Discourse?

Trust levels and moderation tools refined over a decade of real communities; A hosted instance with upgrades, backups and mail delivery configured; Mail-in and mail-out threading, which is fiddly to get right. If any of those carry weight for you, keep paying.

Is there an open-source alternative to Discourse?

Yes: Discourse, Flarum. The prompt on this page is for when you want it your way instead.

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