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Ktistec

Single-user ActivityPub server in Crystal

Social Networks ★ 436 stars Medium setup AGPL-3.0

Ktistec is a single-user ActivityPub server written in Crystal, designed to be easy to deploy and maintain. It provides a personal fediverse presence with a simple, self-contained runtime.

Official siteSource code

Key features

  • Single-user design
  • Self-contained runtime
  • SQLite storage
  • ActivityPub federation

Strengths

  • Released under the AGPL-3.0 license
  • Written in Crystal
  • Tiny footprint — runs in 256 MB RAM

Is Ktistec secure?

OSV.dev has no published security advisories for Ktistec's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Ktistec replaces

Self-hosted Twitter alternativesSelf-hosted Mastodon alternatives

Health badge

Maintain Ktistec? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 79 · good

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   :alt: SelfHostIndex health score for Ktistec
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The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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