Diagramo review
A free, self-hosted flowchart editor with sharing, collaboration, and image exports.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Diagramo is an HTML5-based diagramming application for creating flowcharts and other graphical diagrams. It is aimed at individuals and teams that want free, open-source software for editing diagrams online, sharing them through public links, and collaborating on diagram work. The application supports flowcharts, diagrams, and graphs, with source code available for customization. It can run as an online service, be downloaded for local Windows use, or be deployed on an Apache and PHP server.
Its strongest fit is for organizations that value control over deployment and output formats. Diagramo supports self-hosting and customizable source code, giving technical teams a path to adapt the software or place it on their own server. Sharing and collaboration are included, while public diagram permalinks provide a direct way to distribute diagrams. Export support covers PNG, SVG, GIF, and JPEG, combining a vector option with common image formats for documentation and presentations.
Diagramo is narrower than a broad diagramming suite, with its stated scope centered on flowcharts, diagrams, and graphs. Its listed platform coverage is also limited to web, Windows, and self-hosted deployment, so teams seeking a wider application ecosystem or broader platform support may need to consider alternatives. Commercial licensing, support, and enhancements are offered separately, which matters for organizations planning formal vendor assistance. Choose Diagramo for free, customizable flowchart editing with self-hosting; choose another product if you need a wider feature or platform range.
Diagramo pros and cons
- Where it wins
- Free open-source software with customizable source code
- Supports sharing, collaboration, and public diagram permalinks
- Exports diagrams to PNG, SVG, GIF, and JPEG
- Where it doesn't
- Focuses primarily on flowcharts, diagrams, and graphs
- Platform coverage is limited to web, Windows, and self-hosting
- Commercial licensing, support, and enhancements are separate offerings
Diagramo fact sheet, pricing and score →
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