Fast Architect is a free online tool for creating a variety of diagrams, including Sequence diagrams, Component diagrams, and more, using an intuitive vocabulary.
It enables an automated arrangement of all diagram components and is suited to handle complex layouts and diagram flows. By utilizing correct syntax, it is possible to rapidly generate and edit iterative diagrams with lightning-fast previews. After making a diagram, you have the choice of saving it as a PNG picture or generating a URL that can be shared or embedded.
Fast Architect is a boon for architects and developers who frequently struggle to generate field-related diagrams. It allows you to add extra users with Admin / Editor permissions to your project so that teams may cooperate on diagram creation. Additionally, it assists you in documenting your diagrams by automatically creating a library of the components you’ve used.
Fast Architect supports these diagrams:
- Sequence diagrams show the messages sent between objects to perform a function.
- Component diagrams show how varied components are integrated to construct sophisticated software systems like ERPs, OSS, and more.
- Entity Relationship Diagrams show relationships between people, things, concepts, etc.
- Class diagrams demonstrate a system’s classes’ structure. Paid users only.
- Deployment, Activity, ArchiMate, and other diagrams. Paid users can view these diagrams.
Fast Architect has 3 vertical panels:
- Words: This section explains how to define entities, links, groups, comments, and more.
- Editor: Here you type the diagram’s Syntax.
- Preview: This section shows a real-time diagram as you type syntax.

How to use Fast Architect
- Create a free Fast Architect account using this link. The application offers you a login link through email, so no password is needed. Existing GitHub accounts can be used.
- Click Create Project in Projects and name it.
- Homepage Once the project loads, click Create Diagram and choose Sequence or Component diagram. This opens Diagram Workspace.
- Plan your diagram and start inputting syntax using the left-panel Syntax Help. In the Preview Panel as you write and develop code, you can see your diagram being formed.
- Click Share in the Code Editor box to download or generate a link to the diagram.
- To add members to your project, select the Project Name tab, then Add Members.
- Click Components on the Project home page to see the diagram’s library.
Fast Architect is a free online tool for creating Sequence, Component, and other diagrams. Learn their straightforward and clear syntax to start constructing diagrams, and the automated layout function does the rest.