| What it does | Python framework for building and simulating dynamical systems using block diagrams
| Git-native platform for building, publishing, sharing, and securing APIs
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| Stage | Not given
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| Founded | Not given
| 2022
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| Based in | Not given
| US
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| Pricing model | Open source
| Freemium
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| Pricing | Not given
| Free: $0 (1 seat, 1 API repository, 1 published document with badge, 1 mock server, up to 1,000 mock calls/month). Team: $216/year (3 seats included, $72 per additional seat; unlimited repositories, documents, mock servers, 20,000 mock calls/month). Enterprise: $720/year (5 seats included, $144 per
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| Key features | - 30+ solvers including implicit, explicit, and adaptive integrators
- Zero-crossing detection and scheduled events for hybrid systems
- Hot-swappable blocks and solvers during active simulation
- Hierarchical subsystems for modular component design
- MIMO support with multiple input and output ports
- Browser-based visual editor with PathView
- Domain toolboxes for chemical, battery, vehicle, flight, and RF engineering
- Custom blocks through subclassing the base Block class
- Supports continuous-time, discrete-time, and hybrid systems
- FMI integration to wrap Co-Simulation and Model-Exchange FMUs
| - Git-native repository for API specifications
- Visual OpenAPI editor with live linting
- API documentation generation and publishing
- API governance with predefined and custom rule sets
- Spec-based and code-based mock servers
- Team collaboration with organizations and permissions
- CLI for linting, bundling, and publishing
- MCP server and llms.txt for AI agent integration
- GitHub Actions integration without stored secrets
- Branch and tag protection with push mirrors and webhooks
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| What makes it different | - Readable, scriptable alternative to traditional simulation tools with solver depth
- Full ecosystem including FastSim Rust engine and standalone C code generation
- Minimal runtime dependencies: only numpy, scipy, and matplotlib
- Domain-specific toolboxes for chemical, battery, vehicle, flight, and RF engineering
- MIT license with open source development
| - Every API spec lives in a real Git repository with full version history, review workflow, and blame tracking instead of in a portal
- Open formats with no lock-in: OpenAPI and Markdown in Git, same checks run in CLI and CI
- Quality control through review: governance rule sets run in the editor and again in pull requests before reaching consumers
- CLI is free with MIT license, sends no telemetry, and works offline for linting, scoring and bundling
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 38 ▼ −1 (down) since last check | 36 ● no change since last check |
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| Trust Flow (Majestic) | 6 | 11 |
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| Citation Flow (Majestic) | 14 | 20 |
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| Referring domains (Majestic) | 18 | 16 |
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APIGit