Ilograph

Ilograph is an interactive system-documentation tool for mapping components and their interactions. It suits architects and teams who need reusable diagrams, especially where offline work or controlled deployment matters. Its focused modeling and deployment options are compelling, but plan terms make it important to distinguish individual editing from team collaboration.

Overview

Ilograph is built to explain systems, not to serve as a general-purpose canvas. Its structured diagrams combine component relationships with sequence flows, while perspectives let readers move between detailed and broad views. That makes it a strong fit when documentation must show both what a system contains and how data, business, or security interactions proceed.

The tool also accommodates local and restricted environments: desktop apps work with local files offline, and its export service can run on-premises. That is a meaningful advantage for organizations that cannot depend on an internet-connected workflow.

Key features

Ilograph’s lightweight diagrams-as-code model adds structure and reusability, helping teams maintain consistent system views. Zoom and perspective changes support different levels of explanation without requiring separate diagrams for every audience. Sequence perspectives are particularly useful when the order and movement of information matter as much as the architecture.

Diagrams support keyboard navigation and screen readers, and built-in AWS, Azure, GCP, and networking icons cover common infrastructure contexts. YAML and HTML are supported for import and export. The Team Workspace API is deliberately limited to GET, PUT, and HEAD on existing diagrams; it cannot create or delete diagrams. Requests also require valid access keys and allow-listed IP addresses, which favors controlled integrations over broad, unrestricted automation.

Ilograph Desktop runs on Mac, Windows, and Linux, including Mac M Series and Intel systems and Linux x86-64 and arm64. It uses local files without internet access, making it suitable for air-gapped and behind-firewall work. The on-premises Export API runs in a Docker container and produces standalone HTML without external internet access. The Confluence Cloud app stores diagrams in the Confluence instance and can be used without an Ilograph account, a useful option for teams already working there.

Pricing

Ilograph Free costs nothing (billed per month). It includes unlimited public and private diagrams, unlimited diagram size, the built-in cloud and networking icons, and 14 days of diagram history. The uncapped diagram count and size make it practical for individual evaluation or ongoing use where a short history is sufficient; the history window is the clearest constraint for teams that need to revisit older changes.

Ilograph Pro is $18 a month (billed yearly) and allows 20 viewers per diagram. It fits sharing diagrams with a defined audience, but the viewer cap matters for documentation intended for a broad readership. Ilograph Team costs $30 per editor / month billed monthly and adds team collaboration, a workspace dashboard, and unlimited viewers. The per-editor billing makes it a more appropriate step for active collaborative work than simply broad distribution.

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 and integration. Ilograph Desktop costs $14.99 a month billed monthly, with local files, custom icons, HTML export, and offline use; it is the relevant paid option for local or disconnected editing rather than shared workspace features. The 14-day trial gives prospective users a defined evaluation period. Ilograph for Confluence Cloud has no additional Ilograph account or subscription requirement and supports creating, sharing, and collaborating within Confluence Cloud.

Platforms

Ilograph supports web, API, self-hosted, Linux, macOS, and Windows. Desktop availability across the three major desktop operating systems, including ARM Linux and Apple silicon, broadens its fit beyond browser-dependent workflows. Its offline desktop editing and on-premises HTML export are the strongest platform advantages for security-sensitive environments.

Who it's for

Choose Ilograph when the job is documenting system architecture and interactions with reusable, navigable diagrams, or when local files, offline editing, or on-premises export are requirements. It is less suitable when you need an unrestricted API for creating and deleting diagrams, or when your primary need is a general-purpose drawing tool. Teams should also match the plan to their collaboration model: Pro limits viewers per diagram, while Team charges by editor and removes that viewer ceiling.

Pros and cons

Pros: Unlimited diagram size on the free plan makes it possible to model large systems without a size cap.

Pros: Offline desktop editing and on-premises HTML export support air-gapped or internet-restricted environments.

Pros: Multiple perspectives and sequence flows help communicate both system structure and important interactions.

Cons: The Team Workspace API cannot create or delete diagrams, limiting its usefulness for fully automated diagram lifecycle management.

Cons: Pro allows 20 viewers per diagram, so wider readership may require Team or a different sharing approach.

Cons: Team is charged per editor, which can raise costs as the number of active collaborators grows.

Alternatives

Diagramming Software is the broader category to explore if your needs extend beyond system documentation.

Choose EdrawMax instead if you want a freemium diagramming option spanning Android and iOS as well as desktop and web platforms. Sparx Enterprise Architect is an alternative to consider for a UML modeling environment with multi-user projects. Structurizr is worth comparing for a system-documentation workflow with a 1–20 unique-user server license priced at £300 a month billed annually.

Creately may suit users who prefer a free canvas-based option, though its free plan caps canvases at 45 items. draw.io is a straightforward alternative when a free, open-source tool with no sign-up requirement is the priority. Camunda is another freemium option to consider. Mermaid may fit users seeking a free diagramming option. Microsoft Visio is an alternative for readers who want a paid product with an annual subscription option.

Verdict

Ilograph is the right choice for technical teams that need structured system diagrams and value offline or on-premises workflows. Its unlimited-size free diagrams lower the barrier to adoption, and its desktop and export options address environments where cloud dependence is unwelcome. Look elsewhere if you need broad API lifecycle control or a general-purpose diagramming workspace; for collaborative sharing, weigh Pro’s 20-viewer limit against Team’s per-editor monthly cost.