An Advanced Platform
for the .NET Community
Standards-complete XSLT 4.0, XQuery 4.0, and XPath 4.0 engines. An embedded XML/JSON document database. Integration pipelines with XProc 3.0. All open-source, all built for .NET.
Transform XML in five lines
// Transform XML with XSLT 4.0 in a single call var transformer = new XsltTransformer(); await transformer.LoadStylesheetAsync(File.ReadAllText("style.xsl"), new Uri(Path.GetFullPath("style.xsl"))); string result = await transformer.TransformAsync(File.ReadAllText("data.xml"));
Standards Complete
Full W3C conformance for XSLT 4.0, XQuery 4.0, and XPath 4.0. Passes the official test suites. No compromises on spec compliance.
Built for .NET
Native NuGet package. Async/await throughout. Streams, spans, and zero-copy where it matters. No Java bridges or COM interop.
Open Source Core
Core engine is Apache 2.0 licensed. Use it freely in your projects. Commercial licenses available for redistribution and enterprise features.
Everything you need for XML/JSON processing
A complete platform for document transformation, querying, and storage.
XSLT 4.0
Full W3C XSLT 4.0 with streaming, higher-order functions, maps, arrays, and JSON support.
XQuery 4.0
Complete XQuery 4.0 engine with FLWOR expressions, window clauses, and update facility.
XPath 4.0
Standards-complete XPath 4.0 with arrow operators, lookup expressions, and inline functions.
Document Database
Embedded XML/JSON document store with ACID transactions, MVCC, and rich indexing.
Server Mode
Standalone server with gRPC APIs for processing pipelines and document management.
CLI Tools
Command-line interface for transforms, queries, database operations, and batch processing.
Built on standards. Proven by tests.
2604/2661 W3C XSLT 3.0 conformance tests passing
XQuery engine tests
Built with Crucible — our own documentation site runs on PhoenixmlDb XSLT
Embed PhoenixML in Your Products
Need to redistribute PhoenixML engines as part of your application or platform? Our OEM and redistribution licenses let you ship XML/JSON processing as a built-in capability.
Contact for LicensingSimple, transparent pricing
Start free. Scale when you need to.
Community
For personal projects and evaluation.
- ✓ Full XSLT 4.0 / XQuery 4.0 (unlimited)
- ✓ CLI tools
- ✓ Document database (250 MB, 3 containers)
- ✓ Community support
Pro
For professional developers and teams.
- ✓ Everything in Community
- ✓ 5 GB database storage
- ✓ Unlimited containers & documents
- ✓ Server mode (gRPC)
- ✓ Email support (48hr SLA)
- ✓ Commercial license
Enterprise
For organizations with advanced needs.
- ✓ Everything in Pro
- ✓ Unlimited storage
- ✓ Cluster mode
- ✓ Dedicated support (4hr SLA)
- ✓ Redistribution rights