draw.io vs OmniGraffle

draw.io (also known as diagrams.net) is a free diagramming application used for flowcharts, network diagrams, wireframes, and technical documentation, with a strong emphasis on privacy and self-managed data storage. It is available as a browser app at app.diagrams.net and as a desktop application, and it deliberately maintains long-term backward compatibility with older diagram files.

OmniGraffle is The Omni Group's diagramming and vector illustration app for macOS, iPad, and iPhone, used to explain complex ideas visually through flowcharts, org charts, and wireframes. It includes intelligent grouping, snapping, and alignment tools, cross-device syncing of stencils and projects, and JavaScript-based automation for power users who want to script repetitive diagram tasks. Beyond diagramming, OmniGraffle doubles as a rapid-prototyping and vector design tool, letting teams sketch wireframes and produce polished vector graphics in the same app. It's sold as either a perpetual license (Standard or Pro tiers) or a Pro subscription, with a 14-day free trial available for new users.

• Free with no mandatory account creation or paywall
• Strong data-privacy stance with self-hosted or local storage options
• Old diagram files remain compatible with the current app
• Deep integrations with common workplace tools like Confluence and Jira

• Deep, native Mac/iPad experience with polished UI
• One-time purchase option avoids forced subscription
• Powerful automation via JavaScript for advanced users
• Strong stencil and template library

• Interface is more utilitarian than some modern whiteboard-style competitors
• Advanced enterprise security features are less prominent than dedicated paid diagramming suites
• Less built-in template variety than some commercial diagramming tools

• Mac and iOS only, no native Windows or Web app
• Pro tier is expensive for casual users
• Learning curve for automation features
• No real-time multi-user collaboration like web-based tools