Architecture planning that feels like a senior review.
Spire turns a messy product idea into a structured architecture package: system model, review pack, diagrams, ERD, flows, deployment, API contract, critique, and validation evidence.
Review Pack
ClinicFlow Care Platform
Semantic Diagram
Typed services, data stores, queues, and external systems.
Validation
Coverage, reachability, critique, and artifact consistency.
Generated workspace
Not a pretty drawing. A linked evidence system.
The diagram is just one view. The real value is that every view points back to the same semantic model and validation run.
A Spire package keeps diagrams, API contracts, ERDs, flows, deployment, critique, and validation tied to the same underlying model.
What Spire produces
One idea becomes a complete architecture workspace.
Every artifact is generated from the same structured model, so diagrams, critique, and implementation guidance stay aligned.
Review Pack
Decision narrative, risks, forces, ADRs, and implementation plan.
Semantic Diagram
Typed components, edges, storage, queues, gateways, and service boundaries.
Data + API
ERD, API contract, sequence flows, and deployment topology.
Validation Evidence
Coverage, orphan checks, critique findings, and confidence metadata.
Workflow
The flow is intentionally opinionated.
Spire is not a blank diagram tool. It asks for the product, evaluates the quality targets, generates a model, critiques it, repairs gaps, and renders evidence-backed views.
Capture product intent, users, constraints, and success criteria.
Generate critical user journeys before choosing components.
Build a semantic architecture model with typed components and relations.
Validate coverage, reachability, artifact consistency, and critique findings.
Built for review, not decoration.
The UI keeps trace, validation, diagrams, critique, and implementation narrative together.
Why Spire
Eraser draws boxes. Mermaid renders text. Spire thinks in systems.
Diagram tools start from a blank canvas or syntax editor. Spire starts from your product idea, builds a semantic architecture model, validates it, and exports to the formats your repo and team already use.
| Capability | Spire | Eraser | Mermaid Chart |
|---|---|---|---|
| AI from natural language | Full architecture package | Single diagram | Manual syntax only |
| Semantic model (typed components) | Yes | No | No |
| ERD + API + deployment + validation | Yes | No | No |
| Interactive drill-down | Yes | Canvas edit | No |
| Mermaid / GitHub export | Yes | Limited | Yes |
| Free tier generosity | 5 packages/mo + exports | 5 AI credits total | 3 diagrams total |
| Paid entry price | $8/mo unlimited plans | $10/mo (40 credits) | $7/mo rendering only |
Use Spire to plan and validate. Export Mermaid for GitHub, or paste Eraser-ready markdown when your team wants to polish visuals — without losing the semantic model underneath.
Pricing
Plan the system — not just draw it. Pay less than diagram-only tools.
Start free with full architecture outputs. Paid plans add heavier planning, drill-down, and team workflows — priced for outcomes, not diagram credits.
Free
Explore architecture packages before you commit
Full outputs to try before you commit
- Full diagram set on every project
- Critique scores + validation evidence
- Export to Mermaid & ARCHITECTURE.md
$8/mo
Solo founders and tech leads planning systems
Complete planning — not diagram-only pricing
- Complete review packs on demand
- Drill-down into any component
- Full exports + shareable docs
$18/seat/mo
Teams keeping architecture docs alive
No 5-seat minimum like IcePanel
- Shared team projects
- High-volume architecture workspace
- GitHub sync (coming soon)
Contact sales
Orgs that need compliance & audit
- Enterprise SSO + audit
- Compliance-ready documentation
- Dedicated support
Walk into the next product review with the system already mapped.
Generate a complete architecture package, inspect the evidence, and decide what to build before engineering time gets expensive.