Built with lspkit.

Two language servers run on lspkit today. Both mount the same lsp-profiler engine and the same @nimblesite/lsp-profiler-ui panels; only the runtime crate differs.

SharpLsp: C# and F#

SharpLsp is a C# and F# language server for VS Code. Its profiler attaches to any running .NET process through lsp-profiler-dotnet, paints hot lines in your code, and ranks leak suspects while the app runs.

SharpLsp · C# and F# language server for VS Code ↗SharpLsp profiling a real .NET app in VS Code. Watch the walkthrough ↗

CheckoutPipeline.cs with inline heat bars: ParseCatalog 66.8 percent, PriceBasket 25.1 percent, RenderInvoice 7.6 percent — **SharpLsp** · C# and F# language server for VS Code ↗Hot lines, painted in the source.

SharpLsp Profiler results panel with summary cards, an embedded flame graph and the hot functions table — **SharpLsp** · C# and F# language server for VS Code ↗Results panel, flame graph and hot functions.

Memory dashboard with a steadily climbing heap timeline flagged as a possible leak, beside SessionCache.cs — **SharpLsp** · C# and F# language server for VS Code ↗Live heap timeline.

Suspected leaks ranked HIGH with growth in megabytes and object counts, and an inline leak marker on the CustomerSession declaration — **SharpLsp** · C# and F# language server for VS Code ↗Ranked leak suspects, marked in the source.

SharpLsp · C# and F# language server for VS Code ↗The same profiler on F#: pipeline stages keep their compiler names. Watch the walkthrough ↗

Read the SharpLsp profiler guide ↗

Osprey: a native functional language

Osprey is a functional language with algebraic effects that compiles to native code. Its VS Code extension uses the same profiler to run and profile the open file, attach to a running program, and check for leaks.

Osprey · native functional language with a VS Code extension ↗Osprey's VS Code extension running the lspkit profiler. Watch the walkthrough ↗

busy.osp in VS Code with inline heat bars: collatz 76.4 percent, longest 73.0 percent, fib 22.5 percent — **Osprey** · native functional language with a VS Code extension ↗Heat on Osprey source.

Osprey Profiler panel: 812 samples over 8 seconds, 5 functions, 6 hot lines, above a left-heavy flame graph — **Osprey** · native functional language with a VS Code extension ↗Osprey results panel and flame graph.

Watch the Osprey profiler tutorial ↗

Add your language

A new language needs only a runtime crate that samples its processes. See Profiler for how the pieces fit.