Still Designing your specs like it's 1997?

It's not the diagram that the problem. Its what happens when people stop looking at it

Jargon helps teams escape outdated tooling and chaotic specs - modelling what you actually agree on, once, so it doesnt quietly drift from under you.

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 without alignment, yours are ageing like milk.

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, so your models are built on solid foundations from day one. Real-time feedback means issues get caught at design time — not three teams and two services later.

Design visually.

Lay out how domains and services interact in a shared, structured view. Every team, every service, sees the same picture — before a single line of code is written.

Publish a release, not an edit.

Changes go through suggestions and review before they ship — a new version, not a silent overwrite of the old one. Every team downstream knows exactly which release they're building against.

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.

Which transitions are legal, and when — not just what fields exist. It's usually the part that only lives in one person's head; here it's explicit, and everyone reads the same version of it.

Find what your teams already built.

Across your organisation's domains, the ones your teams actually maintain and rely on surface first — so nobody's quietly building a fifth version of Customer that almost matches the other four.

Search and filter at scale.

View the forest, 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

Any AI agent can spit out a JSON Schema in thirty seconds now. So can Jargon - free, on every plan.

Artefacts were never the hard part. Getting five different generations of it to agree with each other is.

JSONSchema

JSON Sample Data

OpenAPI Spec

JSON-LD / RDF Ontology

JSON-LD Context

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

Everything above is about people agreeing with people. That doesn't stop mattering once one side is an AI agent.

Point an agent at your governed model and it doesn't guess at field names, valid states, or what's allowed to happen next — it reads the same thing your team already agreed on. Read-only, always: nothing it infers gets written back into the model your team is trusting.
It's not a new kind of governance. It's one more consumer who, until now, had no way to ask.

Design what your teams agree on.

Build what your agents can trust.

Try it free
$0

See the whole loop yourself, before you bring in your team.

✓ Domain design & editor
✓ Generate JSON Schema, OpenAPI, JSON-LD
✓ Automated READMEs
✓ State lifecycles
✓ A few sample domains to learn from

Try it free

Team
$1500 / team / month
AUD

For when two teams, or two services - or two agents need to agree on something

Everything in Try it free, plus:

✓ Private domains
✓ Unlimited team members
✓ Team collaboration & suggestions
✓ Governance & validation rules

Your AI agents read the same governed domain your team verified — read-only, always — nothing they can drift or corrupt.

Get Team

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.

Request a demo

Contact sales

Still Designing your specs like it's 1997?

Start with structure.

Design visually.