Ilograph

Overview

Ilograph is a documentation tool for showing system components and how they interact. It is a strong fit for technical teams that need to explain complex systems, especially when diagrams must work offline or stay within a controlled environment. Its structured, interactive views are more specialized than a general-purpose drawing app.

Key features

Ilograph’s model-based diagrams-as-code approach gives system documentation a reusable structure rather than treating every diagram as a separate drawing. Readers can move between detailed and broad views and switch perspectives; sequence views focus on data, business, and security flows. That combination helps when a diagram needs to explain both what a system contains and how its important interactions unfold.

Diagrams support screen readers and keyboard navigation. Built-in AWS, Azure, GCP, and networking icons cover common infrastructure contexts, and YAML and HTML are supported for import and export. The Team Workspace API is deliberately limited to GET, PUT, and HEAD requests for existing diagrams, so it cannot create or delete them. Requests also require valid access keys and allow-listed IP addresses.

Ilograph Desktop runs on Mac, Windows, and Linux, including Apple silicon and Linux ARM64, and edits local files without internet access. That makes it a practical option for air-gapped or behind-firewall work. For delivery pipelines, the Export API runs as an on-premises Docker container without external internet access and produces standalone HTML files. The separate Confluence Cloud app keeps diagrams in the Confluence instance and does not require an Ilograph account.

Pricing

Ilograph Free costs nothing, billed per month. It includes unlimited public and private diagrams, unlimited diagram size, built-in cloud and networking icons, and 14 days of diagram history. The lack of diagram-size and count caps is generous for individual evaluation or smaller projects; the short history window may be limiting when older revisions matter.

Ilograph Pro costs $18 a month, billed yearly, and allows 20 viewers per diagram. It suits sharing diagrams with a defined audience, but the viewer cap should be checked against larger readership needs.

Ilograph Team costs $30 per editor / month, billed monthly. It adds team collaboration, a workspace dashboard, and unlimited viewers, making it the clearer fit when multiple editors maintain diagrams or a broad audience needs access. The per-editor charge means costs scale with the people editing.

Ilograph Team+ has custom pricing and adds SAML 2.0 single sign-on and API access. It is aimed at organizations that need those controls; the Team Workspace API’s restrictions still apply.

Ilograph Desktop costs $14.99 a month, billed monthly, and includes local files, custom icons, HTML export, and offline use. It fits individuals or organizations prioritizing local storage and disconnected editing, though it is a separate paid option from the free web plan.

Ilograph for Confluence Cloud has custom pricing, with creation, sharing, and collaboration inside Confluence Cloud and no additional Ilograph account or subscription required. A 14-day trial is also available.

Platforms

Ilograph is available on the web and through desktop apps for Windows, macOS, and Linux; its platform support also includes API and self-hosted options. The desktop edition’s offline editing and the on-premises export route are meaningful advantages for environments with restricted connectivity.

Who it's for

Choose Ilograph when the goal is to document system architecture and interaction flows with reusable diagrams, especially if accessibility, local files, or offline operation matter. It is less compelling for general-purpose drawing or workflows that require the API to create and delete diagrams directly.

Pros and cons

• Pro: Unlimited diagram size on the free plan removes a common constraint for large system maps.
• Pro: Offline desktop editing and an on-premises HTML export path suit high-security and disconnected environments.
• Pro: Screen-reader support and keyboard navigation make diagrams usable through more than pointer interaction.
• Con: Free-plan history lasts only 14 days, which limits access to older diagram versions.
• Con: Pro limits each diagram to 20 viewers, while Team charges per editor.
• Con: The Team Workspace API cannot create or delete diagrams and requires IP allow-listing, constraining automation.

Alternatives

Diagramming Software is the broader category to browse if Ilograph’s system-documentation focus is too narrow. Choose draw.io instead for a free, open-source option with no sign-up required. EdrawMax is another freemium choice with a free plan and trial. Consider Creately if unlimited canvases and collaborators on its free plan are priorities, though each canvas is limited to 45 items. Structurizr is worth comparing for architecture documentation, but its listed 1–20 unique users plan costs £300 a month billed annually. UMLet is a free, open-source UML tool with desktop, web, Eclipse, and VS Code options. Camunda is an alternative with a free self-managed development plan for local development and testing. Lucidchart offers a free basic diagramming plan if a web- and mobile-focused option is preferable. Microsoft Visio may suit readers seeking a paid diagramming product with an annual Visio Plan 1 option at $5 a month.

Verdict

Ilograph is a strong choice for teams that need structured, interactive system documentation and especially for those working offline or behind strict network controls. Its biggest advantage is the combination of reusable perspectives with local editing and isolated HTML export. Look elsewhere if you need broad drawing flexibility or an API that can manage diagram creation and deletion.