Zulip — system requirementsverification pending

Self-hosted team chat with topic-based threading, an alternative to Slack. · website · repository

Minimum RAM

2 GB

“For installations with fewer users, 1 CPU and 2 GB RAM with 2 GB of swap is sufficient.”

Scope: General self-hosted install (bare installer or Docker), fewer than ~100 users · official source · retrieved 2026-07-26

Minimum CPU cores

1 core

“For installations with fewer users, 1 CPU and 2 GB RAM with 2 GB of swap is sufficient.”

Scope: General self-hosted install (bare installer or Docker), fewer than ~100 users · official source · retrieved 2026-07-26

No official figure published for: recommended RAM, recommended CPU cores

Above-minimum guidance is a scaling table by daily-active-user count (e.g. 4GB at 25+ DAU, 8GB at 100+ DAU, 16GB+ at 400+ DAU), not a single general recommended figure.

We publish nothing we can't source. Evidence of the gap.

External services

postgresql (required) — source
redis (required) — source
rabbitmq (required) — source
memcached (required) — source

Container

Image: ghcr.io/zulip/zulip-server:12.1-0 · compressed size (amd64): 1094 MB · architectures: amd64, arm64 · source, retrieved 2026-07-26

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