Best Open Source Alternatives to Miro in 2026

Miro Costs Add Up Quickly for Teams

Miro's free plan is limited. The Starter plan (needed for unlimited boards and basic collaboration features) costs $8/user/month billed annually — $96/user/year. Business jumps to $16/user/month ($192/user/year). For a 15-person team, Business costs $2,880/year.

Miro is excellent for collaborative workshops, product planning, and visual thinking. But the costs are significant for what is fundamentally a diagramming tool.

Open source alternatives have caught up dramatically. Excalidraw (116K+ GitHub stars) delivers an exceptional free collaborative whiteboard experience. For teams needing structured diagrams, draw.io and Mermaid provide powerful alternatives. For design work, Penpot goes beyond diagramming into UI design.

TL;DR

• Excalidraw (116K+ stars): Best for quick collaborative sketching and informal diagramming. Beautiful hand-drawn aesthetic. Self-hostable or use the free hosted version.
• tldraw (45K+ stars): Best for infinite canvas with clean modern design. Great for structured diagrams and can be embedded in other applications.
• draw.io / diagrams.net (39K+ stars): Best for technical diagrams — architecture, UML, network diagrams, flowcharts.
• Penpot (35K+ stars): Best when you need design + prototyping + diagrams in one tool. Goes beyond Miro's scope.

Quick Comparison

Tool	GitHub Stars	Self-Hostable	Real-Time Collab	Best For	License
Excalidraw	116K+	Yes	Yes	Quick sketching	MIT
tldraw	45K+	Yes	Yes	Structured canvas	Apache 2.0
draw.io	39K+	Yes	Yes (in plugins)	Technical diagrams	Apache 2.0
Penpot	35K+	Yes	Yes	Design + diagrams	MPL-2.0
Mermaid	75K+	Embedded in tools	N/A	Code-based diagrams	MIT

Excalidraw — Best for Collaborative Whiteboarding

Excalidraw (116K+ GitHub stars) is the most popular open source whiteboard tool by a significant margin. The hand-drawn aesthetic and frictionless experience have made it the default tool for team sketching, architecture discussions, and collaborative brainstorming.

What Makes It Stand Out

Instant collaboration: Share a link, others join immediately. No account required for guests. Real-time cursor presence and drawing sync.

Hand-drawn aesthetic: The distinctive "sketchy" visual style makes diagrams feel approachable and less formal — useful for ideation where polished presentation isn't the goal.

Zero friction: Open the website, start drawing. No signup, no installation, no tutorial. This is Excalidraw's biggest strength.

Libraries: Community-created shape libraries for common diagram types — software architecture, networking, flowcharts, UML components. Import them with one click.

Export options: PNG, SVG, JSON (for re-importing). SVG exports are high quality.

VS Code extension: Draw Excalidraw diagrams directly in VS Code and commit them to your repository — popular for documenting software architecture in code.

Self-Hosting

Excalidraw is one of the easiest tools to self-host:

docker run -d \
  -p 5000:80 \
  excalidraw/excalidraw:latest

Single container. No database needed for basic use. For persistent room/collaboration, add the collaboration server.

For teams needing persistent boards, Excalidraw+ (the commercial cloud version) adds rooms and persistence. The self-hosted version handles session-based collaboration without persistence.

Limitations

• No persistent boards in the self-hosted version without additional setup
• Limited to the whiteboard/sketching use case — no CMS-style board management
• Less suitable for formal documentation (hand-drawn aesthetic isn't always appropriate)

Best for: Engineering teams doing quick collaborative sketching, architecture reviews, and technical explanations.

tldraw — Best Modern Infinite Canvas

tldraw (45K+ stars) is both a collaborative whiteboard and an embeddable React component for building infinite canvas applications. As a whiteboard, it's clean, modern, and supports real-time collaboration.

What Makes It Stand Out

Clean design: Unlike Excalidraw's hand-drawn aesthetic, tldraw uses clean geometric shapes and a professional look. Better for polished diagrams and team documentation.

Embeddable library: tldraw is a React library — embed the infinite canvas experience directly in your own application. Build collaborative features into your product.

Frame system: Organize your canvas with frames (like Figma's frames) — create sections for different topics or projects within one infinite canvas.

Multiplayer: Real-time collaboration with presence indicators, following, and cursor sharing.

Sticky notes, arrows, text, media: Rich set of built-in tools for visual communication.

Self-Hosting

git clone https://github.com/tldraw/tldraw
cd apps/dotcom
npm install
npm run dev

For production self-hosting, tldraw requires a sync backend (they provide a server implementation). The self-hosted version supports all tldraw features including collaboration.

Best for: Teams who want a clean, modern whiteboard and developers who want to embed infinite canvas in their own applications.

draw.io (diagrams.net) — Best for Technical Diagrams

draw.io (39K+ GitHub stars) is the most feature-complete technical diagramming tool. While Excalidraw excels at informal sketching, draw.io is the choice for formal technical documentation: architecture diagrams, UML, network topology, flowcharts, and entity-relationship diagrams.

What Makes It Stand Out

Diagram templates: Hundreds of templates for specific diagram types — AWS/GCP/Azure architecture, network diagrams, BPMN, UML, flowcharts, org charts, ERDs.

Shape libraries: Professionally designed shapes for every major cloud provider, networking hardware, software components, and business processes.

Integration with storage: Save diagrams to Google Drive, OneDrive, Dropbox, GitHub, or your own WebDAV — diagrams live wherever your documents live.

Format support: Import and export Visio, Gliffy, and Lucidchart files. Interoperability with other diagramming tools.

Offline capable: Works as a desktop application (Electron) for fully offline diagramming.

Self-Hosting

draw.io's self-hosted version (diagrams.net) is a simple static web application:

docker run -p 8080:8080 \
  jgraph/drawio

No database, no authentication — just the diagramming application. For team use, run it behind your authentication proxy.

Limitations: No real-time collaboration in the self-hosted version without additional infrastructure. Collaboration works through shared storage (Google Drive sync, etc.).

Best for: Developers, architects, and technical teams who need precise, formal technical diagrams.

Penpot — Best When You Need Design + Diagrams

Penpot (35K+ stars) goes beyond Miro's whiteboard scope — it's a full design and prototyping platform similar to Figma, with collaborative whiteboard capabilities included.

What Makes It Stand Out

Design + prototyping: Create UI mockups, wireframes, and interactive prototypes — not just diagrams. Replace both Miro and Figma with one self-hosted tool.

CSS-based design: Penpot uses CSS concepts natively, making handoff to developers natural. Designers work in CSS terms, developers get CSS values directly.

Vector editing: Full SVG-based vector editing with Boolean operations, path editing, and export.

Open format: Designs are stored in an open format (EDN), not proprietary binary files.

Component library: Shared component libraries for design systems and consistent UI patterns.

Self-Hosting

git clone https://github.com/penpot/penpot
cd penpot/docker/images
docker compose up -d

Penpot runs as 5+ Docker containers (app, exporter, backend, frontend, Redis, PostgreSQL). More complex than Excalidraw but complete.

Best for: Design and product teams who want to replace both Miro and Figma with one self-hosted, open source platform.

Cost Comparison: Miro vs Self-Hosted

Miro Annual Costs (15-Person Team)

Plan	Monthly (per user)	Annual
Starter	$8	$1,440
Business	$16	$2,880
Enterprise	Custom	Custom

Self-Hosted Alternative Costs

Tool	Server Cost	Annual
Excalidraw (Hetzner CAX11)	$4/month	$48
tldraw (Hetzner CPX21)	$6.50/month	$78
draw.io (Hetzner CAX11)	$4/month	$48
Penpot (Hetzner CPX31 8GB)	$10/month	$120

Self-hosting saves $1,360-2,760/year for a 15-person team.

The practical choice for most teams: use the free hosted Excalidraw or tldraw for quick collaborative sketching (no self-hosting needed), and self-host draw.io for formal technical diagrams.

Which Tool Should You Choose?

"I want Miro's collaborative brainstorming" → Excalidraw. The free hosted version covers most use cases. Self-host if you need data residency.

"I need polished, organized team boards" → tldraw. Cleaner aesthetic, frames for organization, professional appearance.

"I need technical diagrams (architecture, UML, network)" → draw.io. The most complete technical diagramming tool.

"I want to replace both Miro and Figma" → Penpot. More setup, but full design + prototyping + collaboration in one.

Using These Tools In Your Actual Workflow

The comparison table tells you what each tool can do. Getting your team to actually use them requires understanding how these tools fit into existing workflows versus disrupting them.

Excalidraw in the engineering workflow. The VS Code Excalidraw extension is underused. When engineers write architecture documentation, they usually create a separate diagram in a separate tool, then attach a screenshot to the doc — a workflow that immediately becomes stale. The VS Code extension lets you create .excalidraw files committed alongside code. When the architecture changes, the engineer updates the diagram in the same PR as the code change. The diagram is version-controlled, diff-able, and lives where engineers already work. For teams using GitHub or Gitlab, Excalidraw's SVG export renders directly in README files and wiki pages without any integration setup.

draw.io in the documentation workflow. draw.io integrates directly with Confluence, Google Drive, and Notion. For teams already using one of these platforms, draw.io diagrams live inside the documentation rather than as attached files. The draw.io Confluence plugin embeds diagrams inline and renders them without opening a separate application. When you update the diagram, the change is reflected everywhere the diagram is embedded — no screenshot replacement required. For teams building technical runbooks, architecture decision records, or infrastructure documentation, this tight integration with documentation platforms is more valuable than any specific diagram feature.

Penpot as the Figma replacement. Teams evaluating Penpot should set expectations correctly: it's a capable design and prototyping tool, not just a whiteboard. The migration from Figma requires time — Figma files don't import directly into Penpot, so existing designs need to be rebuilt. For teams starting new projects from scratch, Penpot's component library and CSS-native design approach produce clean handoff to developers. For teams migrating existing Figma workflows, plan for a 4–6 week transition period per designer where productivity drops as they rebuild muscle memory. The long-term outcome — owning your design infrastructure with no per-seat licensing — is financially compelling for teams of 5+ designers.

The no-account collaborative advantage. Excalidraw's shareable room link (where collaborators join without creating an account) is a feature that managed tools like Miro have degraded over time. Getting an external consultant or client into a Miro board now requires them to create a Miro account or be given a limited-access guest view. Excalidraw's real-time collaboration room works for anyone with the link — no account, no download, no friction. For cross-organizational collaboration where you can't require external participants to create accounts, this matters.

Integration with your communication tools. Miro's Slack integration (unfurling board links in Slack) increases ambient awareness of active boards. Recreating this for self-hosted tools requires webhook configuration: Slack's unfurling API can display a preview image of your self-hosted Excalidraw or draw.io diagram if your hosting server serves the image correctly. It's a 30-minute integration for teams that depend on link previews. For asynchronous teams where diagram links frequently appear in Slack or Teams, the investment is worth it.

For product design teams, see best open source Figma alternatives 2026 for a detailed comparison of Penpot, Figma, and Lunacy. For the broader question of which OSS collaboration tools reduce SaaS spending most effectively, see the complete self-hosting stack 2026 guide. Teams self-hosting Penpot or tldraw for the first time should review the self-hosting security checklist 2026 before exposing these services to the public internet — particularly reverse proxy configuration and authentication settings.

Find Your Whiteboard

Browse all Miro alternatives on OSSAlt — compare Excalidraw, tldraw, draw.io, Penpot, and every other open source collaborative whiteboard with deployment guides and feature comparisons.