Spectrum 2

Instant messaging transport. It allows users to chat together even when they are using different IM networks.

Maintained
WebsiteSource code

At a glance

GitHub stars
421
Last activity
2026-10-24
Latest release
2.2.1
2023-06-12
Commits (12 mo)
90
License
GPL-3.0
Language / platform
C++

Maintenance health: Maintained — Activity within the last 12 months.

Run Spectrum 2 yourself

  • RAM: ~2 GB server (1 vCPU)
  • Docker: not detected — install from source or packages

Estimated monthly server cost

ProviderPlan size~ USD / month
Vultr2 GB$10Deploy →
DigitalOcean2 GB$12Deploy →
Akamai (Linode)2 GB$12Deploy →

Rough estimate from the app's stack and category, not a benchmark. Several light apps can share one server. Some hosting links may be affiliate links. We may earn a commission at no extra cost to you; it never affects which apps we list.

Prefer managed hosting? Check PikaPods or Elestio.

Similar self-hosted apps

Rocket.Chat

Communications platform that puts data protection first (alternative to Gitter.im and Slack).

Actively maintained ★ 46.4k MIT 🐳 Docker~$10/mo

Novu

Notification infrastructure for developers.

Actively maintained ★ 40.3k MIT 🐳 Docker~$10/mo

Mattermost

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

Actively maintained ★ 39.5k ⊘ Proprietary 🐳 Docker~$10/mo

Chatwoot

Customer communication platform (alternative to Intercom and Zendesk).

Actively maintained ★ 38.8k ⊘ Proprietary 🐳 Docker~$10/mo

ntfy

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

Actively maintained ★ 35.3k Apache-2.0, GPL-2.0 🐳 Docker~$10/mo

Zulip

Powerful group chat application.

Actively maintained ★ 26.2k Apache-2.0 ~$10/mo

Is this your project? Get it featured or send a correction upstream to awesome-selfhosted-data.