| What it does | Free, open-source desktop and web app for Meta's Muse Code CLI
| XML validation and schema tools for developers
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| Stage | Not given
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| Founded | Not given
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| Based in | IN
| NL
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| Pricing model | Open source
| Freemium
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| Pricing | Free, MIT licensed, no paid tier, no trial, no seats, no account. Runs on your existing Muse Code subscription.
| Free: unlimited individual XML checks, local validation, no account required. Pro: US$19/month (US$190/year), batch 25 files, 10 cloud projects, 10 schemas, 300 validations + 250 invoices/day. Team: US$49/month (US$490/year), batch 100 files, 50 shared projects, 100 schemas, 5 seats, 1,000 validatio
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| Key features | - Projects and sessions grouped by working directory and git worktrees
- Resume sessions including those started in the terminal TUI
- Inline diffs in the thread at the turn that produced them
- Every agent approval surfaced and never bypassed
- Cost tracking at published API rates per thread
- Full keyboard navigation with command palette
- File viewer with source, Markdown, image, video and PDF preview
- Remote daemon support for running the agent on another machine
- VS Code extension available
- Native Windows support with PowerShell
| - Free local XML syntax and formatting checks
- XSD 1.0 validation with local imports and includes
- Optional XSD 1.1 and ISO Schematron XPath 1.0 server validation
- Cloud schema projects with version control
- Batch validation up to 25 files (Pro) or 100 files (Team)
- API access with daily quotas
- Public HTTPS schema import and structural comparison
- EN 16931 and XRechnung invoice validation
- Multi-format invoice validation (Factur-X, KSeF, RO e-Factura, HR-CIUS)
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| What makes it different | - No additional cost or billing on top of existing Muse Code subscription
- Credentials stay with the muse CLI, never stored by Helicon
- Native Windows support without requiring WSL
- MIT licensed open-source with no company behind it
- Sessions and approvals never bypassed or batched
| - Browser-based validation runs locally without uploading documents by default
- Explicit server processing consent required for any upload
- Comprehensive e-invoice validation across six European formats
- Built with AI assistance and documented with primary references
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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) | 11 ▼ −1 (down) since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 14 | 0 |
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| Citation Flow (Majestic) | 27 | 4 |
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| Referring domains (Majestic) | 34 | 1 |
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