C# Generator
Commercial use OK
380+ models
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Model:
+ GPT-5, Claude, Gemini
Describe a class or feature and get modern C# 12 on .NET 8 - file-scoped namespaces, primary constructors, collection expressions, records, pattern matching, async/await. Nullable references enabled. 8 style presets. Self-hosted Qwen 3 Coder is free under the daily pool; premium Claude Sonnet / GPT-5 handle multi-class Blazor pages and tricky EF Core queries better.
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Generate C# code with free AI. .NET applications and Unity scripts.
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen-coder", "messages": [{"role": "user", "content": "Write a Python function that reverses a string."}]}'C# Generator — FAQ
Modern C# 12 on .NET 8 by default - file-scoped namespaces, primary constructors, collection expressions, record types, pattern matching, async/await, nullable reference types enabled. 8 style presets (Production lib / ASP.NET Core 8 minimal API / Blazor / WPF MVVM / WinForms / Unity / EF Core / xUnit tests). Outputs target net8.0 with nullable annotations and TreatWarningsAsErrors ready.
Yes - a typical service + DTO + tests costs ~1,800 tokens on Qwen 3 Coder, inside the 2,500 anonymous / 10,000 signed-up daily pool. Premium Claude Sonnet / GPT-5 available per-call when you need a multi-class Blazor page or a tricky EF Core query.
Copilot ($10 individual / $19 business / $39 enterprise) is great inside Visual Studio / Rider - it knows your project context. Cursor ($20/mo) is VS Code-based, decent for non-Windows C# work. JetBrains AI ($10/mo add-on) is built into Rider. Tabnine ($12/mo Dev) and Codeium (free + $15/mo Pro) round out the autocomplete space. Our tool is browser-based one-shot - paste a description, get a complete class.
.NET 8 (current LTS) by default. Downgrade via the target picker for .NET 6 (previous LTS), .NET Framework 4.8 (legacy Windows), or .NET Standard 2.0 (max-portability libraries). The C# language features the output uses scale with the target.
Pick the ASP.NET Core 8 minimal API preset. Output uses WebApplication.CreateBuilder(), MapGet / MapPost / MapPut / MapDelete with typed handlers, dependency-injected services, proper Results.Ok / Results.NotFound / Results.BadRequest returns, model validation via DataAnnotations or FluentValidation. Swagger wired in via AddEndpointsApiExplorer + AddSwaggerGen.
Pick the EF Core preset. Output defines DbContext + DbSets, migration-ready model configuration via Fluent API, query patterns using LINQ that translate cleanly (no client-side eval surprises). Async queries via ToListAsync / FirstOrDefaultAsync. Includes a sample Program.cs DI registration.
Pick the Blazor preset. Output is .razor files with @code blocks, component parameters via [Parameter], event callbacks via EventCallback, state via cascading values where appropriate. Server vs WebAssembly is described in a comment at the top so you can wire to the right host.
Pick the Unity preset. Output extends MonoBehaviour, uses Unity lifecycle methods (Awake, Start, Update, FixedUpdate), respects single-frame guarantees, avoids LINQ in Update / FixedUpdate (GC pressure), uses [SerializeField] private over public for inspector exposure. Compatible with Unity 2022 LTS.
Yes - primary constructors, collection expressions, required properties, file-scoped namespaces, pattern matching, records for DTOs, init-only setters. Nullable reference types are on, so ? and null-forgiving ! are deliberate.
Pick the xUnit tests preset. Output uses [Fact] / [Theory] / [InlineData], FluentAssertions for readable assertions, IClassFixture for shared setup, Moq for mocking. For NUnit specifically, mention it in your description.
Review every output, especially around DI lifetimes, EF Core query translation (LINQ that does not translate falls back to client-side and tanks performance), and async deadlock risks (.Wait() / .Result are forbidden in the system prompt). For security audits use /code/review/ with security focus.
Yes - POST to /v1/chat/ with the same system prompt this page builds. Useful for build-pipeline code generation, IDE plugins, or scaffolding tools. Bearer auth, rate-limited. Docs at /api/.
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