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Relatrix

An active knowledge-management and multi-modal note-taking platform.
Most knowledge-management tools are glorified bookmarks. You gather articles, highlight text, save links, and then forget everything. Relatrix changes that. Built on a single, uncompromising philosophy: Information only becomes knowledge when you engage with it through active reflection. Every resource you save is a starting point, not a destination. Relatrix provides a multi-modal toolkit to break down, question, and connect information across diverse formats.

Feature Overview:
- Topic Library: Organise your intellectual world into curated folders of resources. Visually organize topics with a fully customizable color picker. You can add web links, PDFs, markdown notes, and absolutely any kind of file as a resource.
- Multi-Modal Resource Timeline: A single chronological feed that unifies your reflections, annotations, and visual captures.
- Tag Management Hub: Manage, explore, and filter your resources across all topics using custom tags.
- Reflection-First Entry: When you save a PDF, web page, markdown note, or any other kind of file, Relatrix encourages you to capture an Opinion immediately.
- Knowledge Links & Tags: Cross-reference other resources, topics, or insights using [[double-bracket]] wiki-style links and organize entries with custom tags using a unified dropdown.
- PDF Reader & Annotation: Flip pages, highlight passages, create bookmarks, and perform web lookups.
- Note Editor: A minimalist markdown canvas designed for clarity.
- Relatrix 3D Knowledge Discovery: A live, physics-simulated 3D graph that renders the connective tissue of your knowledge base.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 2.0.5 (12) suggested Added on Sep 22, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.saadibra.graymatter.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 28 MiB PGP Signature | Build Log

  • Version 2.0.4 (11) - Added on Sep 17, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.saadibra.graymatter.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 28 MiB PGP Signature | Build Log

  • Version 2.0.3 (10) - Added on Sep 16, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.saadibra.graymatter.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 28 MiB PGP Signature | Build Log

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