| What it does | API sequence diagram tool with payloads on every arrow
| AI skill manager that keeps your skills together across tools
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| US
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| Pricing model | Freemium
| Freemium
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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: £0/month with core features. Individual: £6.99/month (one person, 7-day trial). Team: £12.99/member/month (billed per active member).
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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
| - Unified library for importing and organizing skills from multiple sources
- Source tracking to monitor when skills change and decide whether to update
- Security review with Cisco Skill Scanner for prompt injection, exfiltration, and obfuscated code
- Selective skill delivery to specific projects and tools
- Skill capture to turn successful workflows into reusable skills
- Skillbox Trim to reduce command output noise from agent context
- Skillbox AI to draft and review skills with assistance
- Shared workspaces for team collaboration without forcing skills on individuals
- Team standards to require specific skills for workspace consistency
- Weekly workspace usage reports for team admins
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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
| - Library remains separate from active setup, delivering only relevant skills to each tool or project
- Source attachment remembers GitHub or GitLab origin so you can compare versions before updating
- Security findings and approvals tied to exact version reviewed, not carried forward automatically
- Shared team skills do not override individual personal libraries
- Works with existing tools without requiring abandonment of Cursor, Claude Code or repositories
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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 | 2 ▲ +2 (up) since last check |
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| Trust Flow (Majestic) | 3 | 0 |
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| Citation Flow (Majestic) | 22 | 0 |
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| Referring domains (Majestic) | 8 | 0 |
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Volley
Skillbox