About SimStack

Python workflow automation as a service

SimStack is a SaaS platform for building, scheduling, and running Python workflows. You define nodes, which automaticall connect into graphs, and execute jobs on runners while metadata and results live in a central database. For API details, workflow concepts, and server configuration, see the SimStack server documentation.

Database and runners

Every SimStack deployment needs two core components: a database that stores users, workflows, job history, and artifacts, and runners that execute Python workflow steps. Runners pull work from the server, run your code in isolated processes, and report results back.

Self-hosted vs cloud

In self-hosted mode you retain full control: the SimStack server, database, and runners all run where you deploy them. In cloud mode the database and runners are managed locally within your SimStack workspace, but job processes are executed on cloud resources. The runner size (vCPU, memory, and disk) is selected per job through its resource configuration — larger workflows can request a bigger plan from the table below.

Cloud runner pricing

When a cloud job starts, SimStack allocates a runner matching the job's resource profile. Usage is billed from your prepaid cloud credits at the rates below.