# SequenceDiagram.org review (2026): is it any good? > Text-based UML sequence diagrams you can also drag and drop Checked Nov 13, 2026 ยท graded Nov 13, 2026 by ToolGPA. SequenceDiagram.org is an online editor for UML sequence diagrams that combines a text notation with drawing by clicking and dragging in the same model. Parsing and drawing run in the browser, so diagram data is not sent over the internet, and diagrams can be saved to local files or cloud drives. - **Category:** Whiteboards & Mind Maps - **Made by:** NoSpareTime AB (since 2014) - **Website:** https://sequencediagram.org - **Runs on:** Web - **Who should skip it:** Skip it if you want a freeform whiteboard: sequence and architecture diagrams only. - **Facts last checked:** Nov 13, 2026 ## Pricing As of Nov 13, 2026, SequenceDiagram.org is free to use. - **Pricing model:** Free - **Free plan:** None. - **Free trial:** None listed. | Plan | Price | What you get | | --- | --- | --- | | Web app | $0 | The browser editor is free to use; the site invites voluntary Patreon support from $1 a month. | Read from https://sequencediagram.org/ on Nov 13, 2026. Prices change, so confirm with SequenceDiagram.org before buying. ## Key features - **Text and drag-and-drop together:** A diagram is described in a text script and can also be edited by clicking and dragging on the drawing. - **Client-side processing:** All parsing, processing and drawing happens in the browser, which the site says means diagram data is not transferred over the internet. - **Saving and sharing:** Diagrams save to a file, Google Drive, OneDrive or browser storage, and a share link can be generated. - **Export:** Export as SVG with the source text embedded, or as PNG; PDF is produced by printing from the browser. - **Architecture diagrams:** Besides sequence diagrams the editor can create architecture diagrams, which need a recent Chrome, Edge, Firefox or Safari. - **Plugins and on-prem:** Plugins exist for Confluence Cloud and IntelliJ IDEA, and a Docker image is offered for internal company use. ## Good for - Engineers who write sequence diagrams as text - Teams that cannot send diagram data to an outside server - Confluence and IntelliJ users who want diagrams inside those tools ## Worth knowing - It covers sequence and architecture diagrams only, not freeform whiteboarding. - The code is not available under an open-source license. - There is no real-time multi-user editing; sharing is by link or saved file. - The on-prem Docker version is a paid perpetual license, but its price is not published. ## ToolGPA grades **GPA: 3.0 out of 4**, graded Nov 13, 2026. SequenceDiagram.org is a free web editor for sequence and architecture diagrams, and you can type the diagram or drag it. It does nothing else, it has no live multi-user editing, and the code is not open source. - **Value for money: A.** Free to use, with a Patreon at $1 a month for donations. Nothing on the page is paid for features. - **Free plan and trial: A.** Free outright, with no plan, trial or sign-up needed. Work saves to the browser, a file, Google Drive or OneDrive. - **Features: C.** Sequence and architecture diagrams with export and plugins. A smaller job than a whiteboard, and the listing says it covers nothing else. - **Ease of use: C.** No store rating on record. You get a text syntax and a drag-and-drop view to learn. - **Platforms and integrations: B.** Web with Google Drive, OneDrive, Confluence and IntelliJ IDEA integrations. No desktop or phone app. These are ToolGPA's own grades. Graded from this listing, whose facts were read from SequenceDiagram.org's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among whiteboard and mind map tools - SequenceDiagram.org's GPA of 3.0 is higher than 85 of the 98 other whiteboard and mind map tools we grade, and level with 10. - It stands best on free plan and trial (A, above 83 of 98) and worst on features (C, above 0). - SequenceDiagram.org has no paid plan. - On features, ease of use and platforms it scores 2.3 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price. The category's chart of price against score: https://toolgpa.com/charts/whiteboards ## Keep it, or make your own? **Keep it.** SequenceDiagram.org is free, so making your own would save you nothing. And it is not the kind of software a weekend replaces. It is one of the better ones too: its GPA of 3.0 is higher than 85 of the 98 other whiteboard and mind map tools we grade. - You could not: A diagram editor. - You could not: It plugs into other products, Google Drive, OneDrive and Confluence among them, and has an API. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Google Drive, OneDrive, Confluence, IntelliJ IDEA **Tags:** Diagrams, Works offline, Public API ## Alternatives - [WebSequenceDiagrams](https://toolgpa.com/tools/websequencediagrams): Text-to-diagram sequence diagram maker with its own layout engine. [Compare](https://toolgpa.com/compare/sequencediagram-org-vs-websequencediagrams) - [Swimlanes.io](https://toolgpa.com/tools/swimlanes-io): Free text-driven sequence diagram maker that updates live. [Compare](https://toolgpa.com/compare/sequencediagram-org-vs-swimlanes-io) - [PlantUML](https://toolgpa.com/tools/plantuml): Draw UML and other diagrams from plain-text descriptions. [Compare](https://toolgpa.com/compare/plantuml-vs-sequencediagram-org) - [Mermaid](https://toolgpa.com/tools/mermaid): Text-based diagramming platform with AI and a visual editor. [Compare](https://toolgpa.com/compare/mermaid-vs-sequencediagram-org) - [nomnoml](https://toolgpa.com/tools/nomnoml): Text-to-UML diagram editor with a live preview. [Compare](https://toolgpa.com/compare/nomnoml-vs-sequencediagram-org) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://sequencediagram.org/ Page: https://toolgpa.com/tools/sequencediagram-org Listed by ToolGPA (toolgpa.com).