Still Designing your specs like it's 1997 ?

Static Diagrams Won’t Scale. Evolving Models Do.

Jargon helps teams escape outdated tooling and chaotic specs.

Design, govern, and scale your models with DevOps-driven collaboration.

Sign Up - Its Free ›Request a demo ›

Hand holding a floppy disk labeled "api-v2.1.json" in front of a retro computer screen showing "POST /submitForm", with old schema disks and a note marked "new_FINAL_v2" scattered on the desk

Good systems shouldn't grow old.

But your specs are ageing like fish.

Most teams don’t lack intent—they lack alignment.
Jargon helps teams model systems, lifecycles, APIs, and data — with a single source of truth.

Jargon brings order to the chaos.

Model once. Reuse everywhere. Collaborate live.

Here's how it works:

Start with structure.

Validate your designs as you type, ensuring that your models are built on solid foundations. With real-time feedback on design decisions, your developers can catch potential issues before they become problems

Design visually.

Lay out how domains and services interact in a shared, structured view. With Jargon, you can map your architecture from the start—so everyone sees the same picture before a single line of code is written.

Customise templates, not code.

Developers can quickly create high-quality APIs that align with your enterprise standards with customisable templates. Have your team focus on delivering value, not getting bogged down on manual tasks

Not just a pretty picture.

Jargon has intelligent tools to help your teams with all stages of modelling and design.

Model behaviour, not just structure.

Use state machines to drive actions on APIs and enumeration values of properties

Discover better Domains, faster.

Better quality, more frequently maintained and popular Domains bubble to the top of search results

Version confidently.

Automated inspection of your changes makes it easy to know when you've introduced breaking changes

Search and filter at scale.

View the forrest, not the trees, and visualise how your enterprise's Domains interact

Trace every dependency.

View the deep import graph of your Domains to see precisely which ones you depend on

From model to machine-readable.

In seconds.

Generate the artefacts your teams use — instantly.

JSONSchema

JSON Sample Data

OpenAPI Spec

JSON-LD / RDF Ontology

JSON-LD Context

Not sure? Here's a video that explains almost everything

Plans for individuals and teams.

Start free. Scale when ready.

Free
$0

Learn the ropes

✓ Public domains
✓ Domain design & editor
✓ Searchable domain library

Solo
$15 / month
AUD

For private modelling and artefact generation

✓ Private domains
✓ Generate JSON Schema, OpenAPI Spec, JSON-LD
✓ Automated READMEs
✓ State lifecycles

Team
$60 / user / month
AUD

For structured collaboration and governance

✓ Team collaboration
✓ Suggestions
✓ Governance & validation rules
✓ Verifiable Credential

Need your own environment?
The Enterprise plan includes everything in Team, plus:

✓ Dedicated hosting (on-prem or cloud)
✓ Enterprise data management views + reports
✓ Single Sign On
✓ Professional services for onboarding & custom modelling support