Discourse (self-host) vs Lemmy
Self-host pick — both replace Reddit (Threaded community / forum).
Both Discourse (self-host) and Lemmy self-host as a replacement for Reddit (Threaded community / forum). Pick Discourse (self-host) if you want a GPL-licensed codebase (GPL-2.0); pick Lemmy for AGPL (AGPL-3.0). Both run in roughly the same cost bracket — $10-20/mo vps — discourse needs at least 2gb ram and external smtp; mailgun/postmark/resend handle the email cost line vs $5-10/mo vps for a small instance; storage scales with image uploads.
| Discourse (self-host)open-source | Lemmyopen-source | |
|---|---|---|
| License | GPL-2.0 | AGPL-3.0 |
| Setup time | 30min — official `discourse_docker` standalone install | 30min docker-compose (Rust backend + Postgres + UI + pict-rs for images) |
| Monthly cost | $10-20/mo VPS — Discourse needs at least 2GB RAM and external SMTP; Mailgun/Postmark/Resend handle the email cost line. | $5-10/mo VPS for a small instance; storage scales with image uploads. |
| GitHub | discourse/discourse | LemmyNet/lemmy |
| Replaces | Reddit + 1 other |
Good fit for
Discourse (self-host)
Long-form communities, support forums, and mature subreddits that ran more like discussion boards than link-aggregators.
Weak at:Not a vote-ranked link aggregator — the front page is chronological, not algorithmic.
Lemmy
Communities that want a Reddit-shaped federated home and value the upvote/downvote ranking model.
Weak at:Mobile clients are improving but inconsistent; smaller global reach than Reddit's network effect.
In a terminal? npx -y github:SolvoHQ/os-alt-cli reddit prints Reddit's self-host options including both —
how the CLI works →
FAQ
Which is easier to self-host, Discourse (self-host) or Lemmy?
Discourse (self-host): 30min — official `discourse_docker` standalone install. Lemmy: 30min docker-compose (Rust backend + Postgres + UI + pict-rs for images).
What does each cost to run?
Discourse (self-host): $10-20/mo VPS — Discourse needs at least 2GB RAM and external SMTP; Mailgun/Postmark/Resend handle the email cost line.. Lemmy: $5-10/mo VPS for a small instance; storage scales with image uploads.. Both projects are free and open source.
Do Discourse (self-host) and Lemmy replace the same SaaS?
Yes — both are open-source alternatives to Reddit.