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twilio/twilio-csharp
Twilio C#/.NET Helper Library for .NET6+.
The official Twilio C# SDK for .NET 6+, covering the full Twilio REST API surface: SMS, voice, video, TwiML generation, JWT access tokens, and now OAuth 2.0. If you're integrating Twilio into a .NET backend, this is the package — there's no serious alternative.
The TwiML builder API is genuinely well-designed: fluent, typed, and you can unit-test your TwiML output without any HTTP. JWT token generation for client-side SDKs (video, voice grants) is built in and correct — a common footgun that's handled for you. The custom HTTP client interface makes it straightforward to swap in your own HttpClient for testing or to add middleware. OAuth 2.0 / Client Credentials support is now included, which matters for server-to-server flows that don't want to embed raw credentials.
The static `TwilioClient.Init()` / `CallResource.Create()` pattern is a global singleton that does not play well with DI containers or parallel tests — you have to explicitly pass client instances everywhere or accept the global state. The star count (709) is surprisingly low for an official SDK of a major platform, which reflects that most people find it via NuGet rather than GitHub, but it also means community issue activity is thin. The OAuth implementation is still marked beta with a note that it's subject to change, so don't build a production auth flow on it yet. Code generation is evident from the sheer volume of near-identical Options/Resource file pairs — that's fine until you hit a bug in the generator, at which point fixing one endpoint means waiting for a new codegen run.