Reaktor: The Unreal Engine of App & Server Development
Reaktor is a Kotlin Multiplatform application framework that models apps and services as directed graphs of typed nodes. It is designed to be a working polyglot runtime, with a goal of becoming the "Unreal Engine" for general application development.
Core Architecture: Graph of Graphs
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Executive Summary
At its core, Reaktor addresses the chasm between a working framework and a dominant ecosystem. By replicating the patterns that made Unreal Engine dominant in the gaming world, Reaktor aims to provide a unified runtime that works across every target.
- Unified Model: Directed graphs of typed nodes for entire systems.
- Polyglot Runtime: Native performance on Android, iOS, JVM, Cloudflare Workers, and Desktop.
- Developer Experience: Visual scripting (Blueprints), hot reload, and graph visualization.
The Unreal Engine Playbook
Unreal Engine achieved dominance through six pillars, which Reaktor maps onto its own domain:
| Pillar | Unreal Engine | Reaktor Equivalent |
|---|---|---|
| Flagship Product | Fortnite: Proved the engine at scale. | Bestbuds: The showcase app handling real traffic and complexity. |
| Low-Barrier Entry | Blueprints: Visual scripting for non-programmers. | Schema DSL, CLI scaffolding, and GenUI for rapid shipping. |
| Asset Marketplace | Unreal Marketplace with plugins and models. | Reaktor Module Registry: Pre-built auth, payments, chat, etc. |
| Cross-Platform | PC, console, mobile, VR from one codebase. | Android, iOS, JVM, Workers, Desktop from one graph. |
| Developer Experience | Editor, live preview, hot reload, profiling. | CLI, hot reload, graph visualizer, telemetry dashboard. |
| Community & Ecosystem | Millions of developers, learning resources. | Open-source core, contributor program, tutorials. |