ComposeAI biology as code
Run Boltz, DiffDock, SBML pathways, custom dynamics, and many more lab-contained modules in one pipeline. From your terminal, your browser, or your desktop.

See Biosimulant in action
Four real labs, running in your browser.

Drug discovery
Predict how a drug binds, from text
Paste a protein sequence and a candidate drug. The model folds the protein, drops it into the right pocket, and scores how tightly they bind. A week of wet-lab work, in a single pass. The leap that made structure-based drug discovery practical.
One contract. Any biology standard.
Three steps. Anything else that follows the same contract, an SBML pathway, a CellML cardiac cell, a NeuroML neuron, an ONNX inference module, your own ODEs, can plug straight into your model.
- Subclass
BioModule. - Declare
inputs()andoutputs()as named ports with units. - Implement
advance_window.
The runtime handles unit checks, time alignment, and signal delivery.
import biosimulant
class Pancreas(biosimulant.BioModule):
def inputs(self):
return {"glucose": biosimulant.SignalSpec.scalar(emitted_unit="mmol/L")}
def outputs(self):
return {"insulin": biosimulant.SignalSpec.scalar(emitted_unit="pmol/L")}
def advance_window(self, start, end):
... # advance state to `end`
def get_outputs(self):
return self._outputs
A cadence for every persona
Biosimulant meets you where you are. Code a model from scratch with the desktop app or CLI, or come to play, fork, and ask the agent. Same Hub, same runs, same outputs.
One platform, three surfaces
An open simulation runtime, a workbench you can run anywhere, and a public hub of runnable labs.

Biosimulant Platform
The simulation workbench, on every surface.
The hosted platform built on the open-source biosimulant runtime. Compose labs, run sims, and compare results from your browser, your desktop, or your terminal. One platform, three ways in.
Open source runtime
The MIT-licensed biosimulant runtime.
The Python core that powers the platform. Compose biomodules into runnable worlds, locally, in CI, or anywhere Python runs.

Biosimulant Hub
A public catalog of runnable labs.
Discover, version, and publish labs across SBML, CellML, NeuroML, and more. The shared shelf for simulation work.
Talk to us about your simulation workflow
Biosimulant Platform is for teams building reusable virtual simulations across research and engineering.
- Research teams building reusable virtual experiments instead of one-off simulations.
- Simulation groups that need inspectable workflows, reproducible runs, and shared review loops.
Contact
Start the conversation
Tell us what you are simulating, how your team works today, and where Biosimulant might fit.
Prefer the standalone page? Use the contact page.