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Stormboard alternatives · Whiteboards

Open-source alternatives to Stormboard

Stormboard is not described as open source on its own site. 12 of the 98 other whiteboard and mind map tools in this directory are open source, according to their own sites.

Stormboard has a free plan. Paid plans start at $8.33 per user / month, billed annually ($100 a year). All of them are free or have a free plan.

12 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

How each one differs from Stormboard

  1. Parabol

    Retrospectives, standups and sprint poker for agile teams

    • Parabol starts at $8 per active user / month. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • Parabol is open source, according to its own site.
    • Stormboard also covers whiteboard and reports.
    Parabol pricing and details

  2. draw.io

    Free diagram editor that saves files to storage you choose

    • draw.io is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only draw.io lists macOS and Linux apps.
    • Only Stormboard lists iOS and Android apps.
    • draw.io is open source and self-hostable, according to its own site.
    draw.io pricing and details

  3. Excalidraw

    Open-source whiteboard for hand-drawn style sketches and diagrams

    • Excalidraw starts at $6 per user / month, billed annually. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • Excalidraw is open source, self-hostable and end-to-end encrypted, according to its own site.
    • Excalidraw also covers diagrams.
    Excalidraw pricing and details

  4. Freeplane

    Free, open source mind mapping app for the desktop

    • Freeplane is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Freeplane lists macOS and Linux apps.
    • Only Stormboard lists a web app.
    • Only Stormboard lists iOS and Android apps.
    Freeplane pricing and details

  5. Pencil Project

    Free open-source desktop tool for GUI mockups and diagrams

    • Pencil Project is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Pencil Project lists macOS and Linux apps.
    • Only Stormboard lists a web app.
    • Only Stormboard lists iOS and Android apps.
    Pencil Project pricing and details

  6. OpenBoard

    Free open-source interactive whiteboard software for classrooms

    • OpenBoard is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only OpenBoard lists macOS and Linux apps.
    • Only Stormboard lists a web app.
    • Only Stormboard lists iOS and Android apps.
    OpenBoard pricing and details

  7. Flowchart Fun

    Text-based flowchart maker that draws diagrams as you type

    • Flowchart Fun starts at $2 per month (billing basis not stated). Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • Flowchart Fun is open source, according to its own site.
    • Flowchart Fun also covers mind mapping and diagrams.
    Flowchart Fun pricing and details

  8. WiseMapping

    Free open-source online mind mapping with a self-hosted option

    • WiseMapping is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only WiseMapping lists macOS and Linux apps.
    • Only Stormboard lists iOS and Android apps.
    • WiseMapping is open source and self-hostable, according to its own site.
    WiseMapping pricing and details

  9. Structurizr

    Open-source models-as-code tool for C4 architecture diagrams

    • Structurizr starts at £300 per month for up to 20 unique users, per server installation. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • Structurizr is open source and self-hostable, according to its own site.
    • Structurizr also covers diagrams.
    Structurizr pricing and details

  10. PlantUML

    Draw UML and other diagrams from plain-text descriptions

    • PlantUML is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only PlantUML lists a browser extension.
    • Only Stormboard lists Windows, iOS and Android apps.
    • PlantUML is open source, according to its own site.
    PlantUML pricing and details

  11. Markmap

    Free open-source tool that turns Markdown outlines into mind maps

    • Markmap is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • Markmap is open source, according to its own site.
    • Markmap also covers Markdown, mind mapping and diagrams.
    Markmap pricing and details

  12. nomnoml

    Text-to-UML diagram editor with a live preview

    • nomnoml is free. Stormboard starts at $8.33 per user / month, billed annually ($100 a year).
    • Only Stormboard lists Windows, iOS and Android apps.
    • nomnoml is open source, according to its own site.
    • nomnoml also covers diagrams.
    nomnoml pricing and details

Common questions

Is there an open-source alternative to Stormboard?

Yes. Parabol, draw.io, Excalidraw, Freeplane, Pencil Project, OpenBoard, Flowchart Fun, WiseMapping and 4 more are open source, according to their own sites.

Is Stormboard open source?

Stormboard is not described as open source on its own site. The listing was checked on Oct 6, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Stormboard: the alternatives its listing names first, then the tools that share the most features with it.