Solarch

Solarch is a backend-architecture design tool that inverts the typical AI coding workflow: instead of generating code and hoping the architecture holds up, it generates and validates the architecture first, then compiles code from the verified graph. Built by Solarch (solarch.dev), the tool is live and accessible at app.solarch.dev, with a free tier and paid plans available.

What It Is

Solarch is a canvas-based diagramming and code-generation platform for backend systems. Users draw their system as a node/edge graph — controllers, services, repositories, tables, DTOs, queues — and a strict Rules Engine validates every connection in real time. The validated graph then drives a hybrid code engine that produces type-safe, architecture-aligned code. The tool positions itself as an "architecture-first" alternative to AI coding assistants like Copilot or Cursor.

How the Rules Engine Works

The Rules Engine is a default-deny validator at the core of Solarch. Every connection that is not explicitly whitelisted is forbidden. According to the product page, it enforces 7 anti-patterns and 3 conditional checks — for example, a Controller cannot reach a Table directly and must route through a Service or Repository. Illegal edges are rejected the moment you draw them, not after commits. Rejections feed back into the AI loop until the graph is clean, or the change never commits.

The Hybrid Code Engine

Solarch uses a two-stage code generation pipeline:

• Stage 1 (deterministic, 0 tokens): A compiler turns the graph into a skeleton — DTOs, entities, and constructor injection derived directly from the edges.
• Stage 2 (surgical AI, ~300 tokens/function): AI fills only the empty function bodies, not the entire file.

Exports include runnable code (ZIP), Mermaid diagrams, API contracts, and AI-readable vector memory formatted for Cursor and Claude.

Canvas Architecture and Graph Model

The canvas supports 21 node types across 8 families (Data, Business, Access, Infra, Client, Security, Config, Structure) and 16 typed semantic edges. Projects can be split into tabs, and each node lives in exactly one tab — other tabs import it as a ghost reference rather than a copy, preserving a single source of truth. A fractal graph feature enables semantic zoom from macro module views down to micro-graphs. The tool also integrates LangGraph and GraphRAG to ground AI proposals in a vector-indexed library of canonical architecture patterns.

Two Interaction Modes

Solarch exposes a single omni-bar with two modes:

• Agent mode: An autonomous builder that generates a full architecture from a natural-language prompt.
• Instruct mode: A conversational architect for iterative, guided design without leaving the canvas.

Both modes operate on the same validated canvas, so every AI-proposed change passes through the Rules Engine before it lands.

Current Status

Solarch is live as of 2026. The free tier requires no credit card and supports 2 projects with the AI architect and Rules Engine included. Paid plans (Draw, Build, Code) each include a 7-day trial. A Team plan (per seat) and an Enterprise plan (self-host, SSO, audit logs, custom rules matrix) are also listed; the Code plan is marked "coming soon" on the pricing page.