| What it does | Micro-frontend architecture framework for composing web applications
| API sequence diagram tool with payloads on every arrow
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Open source
| Freemium
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| Pricing | Not given
| Free: editor, local diagrams, share links, SVG and PNG export, CLI, 3 saved diagrams, HAR imports up to 8 requests, 200 hosted API and MCP calls a month, 1 webhook inbox with 25 requests a month, 1 recording link with 3 recordings. Pro: $9/month or $90/year (billed in advance), up to 1,000 saved dia
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| Key features | - Typed host and hostee SDKs for building and embedding features
- CLI for initialization, building, and development with feature.config.*
- Dev server with debug UI for inspecting host/hostee message traffic
- Multiple display modes: embedded, dialog, popup, standalone
- Contract declaration with message validation and schema enforcement
- Optional encryption with v3 and v4 protocols
- Framework-agnostic with support for React, Vue, Angular, vanilla JS
- Lifecycle management with open/close and ready state handling
- Message broker with typed routing and validation
| - Plain-text sequence diagram editor with real-time rendering
- Request and response payloads displayed on every arrow
- HAR file import with automatic redaction of secrets
- Webhook inbox to capture and diagram provider deliveries
- Recording links to collect customer HAR files as diagrams
- Drift Check to update diagrams when APIs change
- SVG and PNG export for sharing and embedding
- AI agent support via MCP server, HTTP API and CLI
- README embeds that update when diagrams are edited
- Presentation mode for step-through walkthroughs
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| What makes it different | - Zero runtime dependencies and self-contained feature packages require no transitive install burden
- Modernize without a rewrite by composing existing applications of any age
- Contract-based type safety with handshake validation and fail-closed security
- Production-ready static file server with optional encryption and message inspection
| - No account needed to write and share diagrams
- AI can write diagrams from plain-text syntax
- Built from real traffic: HAR files, webhooks and customer recordings
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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) | Not checked yet ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 5 | 3 |
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| Citation Flow (Majestic) | 21 | 22 |
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| Referring domains (Majestic) | 9 | 8 |
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HyperFrontend
Volley