| What it does | API sequence diagram tool with payloads on every arrow
| A signed, machine-readable copy of your website that AI agents can read and verify
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| Stage | Not given
| Startup
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| Founded | Not given
| 2025
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| Based in | Not given
| US
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| Pricing model | Freemium
| Free
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| Pricing | 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
| Free for all accounts
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| Key features | - 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
| - 77 tools across 14 groups for setup, publishing, delivery, keys, readers, connectors, Google integration, listings, commerce, reports and company management
- Public API routes for reading company records without authentication
- RFC 9421 digital signatures with signature verification capability
- Read receipts tracking who accessed signed copies
- Automatic fallback to cached copies when Trooth is slow or unavailable
- Agent key support for autonomous AI operations
- Two-officer signing policy for company security
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| What makes it different | - 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
| - AI agents can autonomously set up and manage Semanto with MCP integration
- Cryptographically signed records that can be verified by anyone without authentication
- Public API routes with no account requirement for reading and verifying company records
- Adapter ensures website availability even when Trooth service is slow or down
- Comprehensive toolset of 77 tools for managing every aspect of signed company records
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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) | 3 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 3 | 0 |
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| Citation Flow (Majestic) | 22 | 27 |
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| Referring domains (Majestic) | 8 | 35 |
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Volley
Semanto™