Solarch
Draw backend architecture, get validated code.
Solarch flips the AI coding script—architecture before code, enforced by a real default-deny rules engine. It's a standout for NestJS teams tired of drift, but the deep backend focus limits its appeal. For its niche, it delivers on the promise of compile-time architectural correctness.
- Backend developers designing NestJS applications
- Software architects enforcing strict architectural boundaries
- Teams wanting to eliminate architectural drift in CI/CD
- Developers who prefer architecture-first design over code-first
- Frontend-only or full-stack developers not focused on backend architecture
- Complete beginners without understanding of backend patterns (layers, services, repositories)
- Teams that rely entirely on LLM-generated code without manual architecture review
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Skip Solarch if you don't use NestJS or TypeScript for backend development, or if you prefer code-first AI generation over architecture-first design.
The free tier only allows 2 projects; to work on more you must upgrade to Draw ($5/mo) or higher.
Solarch's pricing scales from a $0/mo free tier (2 projects) to $100/mo for full auto-code. For disciplined NestJS teams, the Build tier at $20/mo (unlimited projects, codegen) is competitive with Copilot ($10-39/mo/person) while providing architecture enforcement. The Draw tier at $5/mo is a cheap way to validate architecture before committing to code generation.
In short
Solarch — Draw backend architecture, get validated code. Best for Backend developers designing NestJS applications, Software architects enforcing strict architectural boundaries, Teams wanting to eliminate architectural drift in CI/CD. Free to start; paid plans from $5/mo.
What's new in Solarch
Checked 14 days agoAcross the latest 2 updates: 2 news mentions.
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Surveys essential diagram types (Architecture, ER, Sequence) and reviews diagramming tools including Solarch.
Viability Score
How likely is Solarch to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Live node-edge diagram canvas with drag-and-drop
- Default-deny Rules Engine: 7 anti-patterns + 3 conditional checks
- AI-powered code generation with deterministic skeleton + AI-filled bodies
- Fractal Graph: semantic zoom from macro modules to micro-graphs
- Vector Export for AI-readable memory
- Autonomous QA: red team, smart seeding, time-travel snapshots
- 21 node types across 8 families (Data, Business, Access, etc.)
- 16 typed semantic edges
- Omni-bar with two modes: autonomous builder and conversational architect
- LangGraph integration for canonical pattern library
- VS Code Extension for architecture revision and live drift detection
- CLI for NestJS: drift guard, two-way sync, codegen
- MCP Server for AI agent architecture context and rule-checked writes
- Multi-tab projects with ghost references (one node, many views)
- Type-safe from schema to UI: schema → API → typed client
About Solarch
Solarch is an architecture-first diagram-to-code platform for backend developers and architects. You design a node-edge graph of your system—controllers, services, repositories, tables, queues—and Solarch's default-deny Rules Engine validates every connection in real time, rejecting illegal edges before they reach the canvas. The Code Engine then generates deterministic skeleton code (DTOs, entities, constructor injection) from the validated graph, and surgical AI fills only the empty function bodies—resulting in architecture-first code that aligns with your design. The platform supports 8 families (Data, Business, Access, Infra, Client, Security, Config, Structure) with 21 node types and 16 typed semantic edges. Key features include a Fractal Graph for semantic zoom from macro modules to micro-graphs, Vector Export for AI-readable memory, and Autonomous QA with red-team testing and time-travel snapshots. Developer tools include a VS Code Extension for drift detection, a CLI for NestJS two-way sync and codegen (with CI drift guard), and an MCP Server for AI agent integration. Solarch's Omni-bar offers two modes: an autonomous builder that reads prompts and draws validated architectures, and a conversational architect. The system integrates with LangGraph to ground plans in a vector-indexed library of canonical patterns (rest-api, auth, cqrs, graph, vector-index). Notably, Solarch's pipeline disallows architectural drift by design—unlike Copilot or Cursor, which generate code first and hope architecture holds, Solarch generates a validated graph first, then code. It targets disciplined backend teams, especially those building NestJS applications.
Behind the Verdict
Solarch is one of the few tools that genuinely enforces architectural constraints before code generation. Its default-deny rules engine is a differentiator—most AI code tools generate first and hope for the best, but Solarch rejects illegal edges (like a Controller talking directly to a Table) at draw time. The deterministic skeleton generation (zero tokens for DTOs, entities, constructor injection) plus surgical AI fill (~300 tokens per function) is a pragmatic hybrid that avoids the 'blob of generated code' problem. The Fractal Graph, Vector Export, and Autonomous QA features add depth for serious teams. However, the tool is heavily NestJS- and TypeScript-oriented; if you're in Python, Go, or another stack, you'll get limited value. The free tier is restrictive (2 projects), and advanced features like MCP Server and VS Code Extension require paid plans. For disciplined backend teams building layered architectures, Solarch is a coherent solution; for frontend-heavy or full-stack projects, it's overkill.
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Real-world workflow fit
Concrete scenarios for the personas Solarch actually fits — and what changes day-one when you adopt it.
You sketch controllers, services, and repositories on the canvas; the Rules Engine rejects a direct Controller-to-Table edge and suggests inserting a Service and Repository.
Outcome: Validated architecture with no illegal dependencies, ready for code generation.
You import the existing codebase via CLI, run drift detection to see uncommitted changes, then add a new entity and service via Omni-bar Agent Instruct.
Outcome: Updated architecture and generated code that stays in sync with the existing project structure.
You configure the CLI as a CI step that rejects pull requests if the architecture drifts from the approved graph.
Outcome: Architecture violations are caught at merge time, preventing drift from reaching production.
Use Cases
- Design a microservices backend by drawing controllers, services, and repositories on a single canvas with validated edges.
- Generate a NestJS project skeleton from an architecture diagram, then let AI fill in controller and service methods.
- Enforce layering rules in an existing codebase by importing it into Solarch and running drift detection via CLI.
- Create a type-safe API contract from a database schema, ensuring frontend and backend stay in sync at compile time.
- Use the Omni-bar Agent Instruct to generate a complete architecture from a natural language prompt, then export code.
- Integrate Solarch as an MCP server for AI agents, providing architecture context and rule-checked code writes.
Limitations
- The free tier limits to 2 projects, which may be restrictive for larger architectures.
- Advanced features like AI code generation, VS Code Extension, and MCP Server require a paid plan.
- The tool is heavily oriented toward NestJS and TypeScript, limiting language flexibility.
- Specific model names (e.g., GPT-4o, Claude) are not explicitly stated in the scraped pages.
as of 2026-07-06
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Solarch tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Solo developer or learner exploring architecture-first design with up to 2 projects.
What this tier adds
Free entry point with no credit card; limited to 2 projects (versus unlimited on Draw).
Draw
$5/mo
Ideal for
Individual architect or small team wanting unlimited architectural diagrams with full rules validation.
What this tier adds
Unlimited projects and all node/edge types; no code generation (available in Build and Code).
Build
$20/mo
Ideal for
Backend developer needing code generation and ZIP export for a single project or prototype.
What this tier adds
Adds AI code generation (deterministic skeleton + AI fill) and ZIP export over Draw.
Team
$30/seat
Ideal for
Small organization needing shared projects with ghost references and cross-team node reuse.
What this tier adds
Adds team collaboration: shared projects, ghost references, and single-home nodes across the org.
Code
$100/mo
Ideal for
Power user or small team wanting Solarch to generate the entire codebase with maximum AI usage.
What this tier adds
Full codebase generation (not just skeleton) and maximum AI usage; extended limits at a discount.
Enterprise
Contact us
Ideal for
Large organization requiring self-hosting, SSO, audit logs, and custom rules.
What this tier adds
Adds self-host, SSO, audit logs, custom rules matrix, and dedicated support.
Where the pricing makes sense
The company stage and team size where Solarch's pricing actually pencils out — and where peers do it cheaper.
Solarch's pricing scales from a $0/mo free tier (2 projects) to $100/mo for full auto-code. For disciplined NestJS teams, the Build tier at $20/mo (unlimited projects, codegen) is competitive with Copilot ($10-39/mo/person) while providing architecture enforcement. The Draw tier at $5/mo is a cheap way to validate architecture before committing to code generation.
Setup time & first value
How long it actually takes to get something useful out of Solarch — broken out by persona, not the marketing-page minute.
For a new project: ~10 minutes to draw a simple graph and generate skeleton code. Importing an existing NestJS project via CLI takes ~15 minutes. Mastering the full suite (MCP, CI integration) may take an hour.
Switching to or from Solarch
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From a hand-drawn diagram or whiteboard: recreate your architecture in Solarch's canvas, then generate code from the validated graph.
- →From a NestJS codebase with no diagram: run the CLI import command to create an initial graph, then refine with drift runs.
- ↗To a standard NestJS codebase: export generated code and continue using NestJS without Solarch; the code is standard TypeScript.
- ↗To another diagramming tool: export the graph as Mermaid or Vector Export for import into tools like Draw.io or Lucidchart.
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