[ANN] Dyad: A New Language to Make Hardware Engineering as Fast as Software

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Thank you @michael.tiller, @viralbshah, and @StefanKarpinski for the detailed replies so far. Two contractual and two deployment questions remain for me.

My use-case and background

I’m the author of the Business Simulation Library (BSL) for Modelica, which uses acausal connectors for causal system dynamics models in a neat way (@Michael.tiller 's book got me started). Currently, I am working on an extended version called Acausal System Dynamics (AcausalSD™), which

  • adopts Modelica’s synchronous-time framework for discrete behavior,
  • offers classes for truly acausal modeling of economic systems grounded in a bond graph approach.

My Modelica tool of choice is Wolfram System Modeler, which currently is unique in its support of more flexible units and smart unit checking (in economic models we need years as a displayUnit, discrete counts like each, and money as a non-SI-unit.

The reality of FOSS monetization

Dual licensing (AGPL-3 + commercial licence) is the only viable way for indie library authors who are not in academia.
I’m happy to pay for tooling the moment corporate users pay for my work, but seat prices that ignore the value a library brings back to the ecosystem feel unbalanced.

Vendor lock-in concerns

@StefanKarpinski kindly floated the idea of an open-source trigger if JuliaHub ever drops Dyad. That helps, but day-to-day risks remain:

  • Q1: Can commercial contracts include a price-cap clause and block forced tier migrations?
  • Q2: Will perpetual fallback licenses be offered so we can keep using the last paid version if future pricing becomes prohibitive?

Cloud independence & EU data sovereignty

Many EU customers refuse to put their data on servers subject to the US CLOUD Act (for good reason imo).

  • Q3: Can Dyad Studio and CLI be licensed for fully offline, air-gapped use?
  • Q4: Is an EU-only JuliaHub region (operated by an EU-incorporated entity) on the roadmap?

Answers on these four points will help me decide whether I invest in a Dyad seat now or stay on my all-FOSS Modelica → Julia workflow for the moment. Thanks again!

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