VaultSharp
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The Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Mar 2026
VaultSharp is the .NET client library for HashiCorp Vault. Instead of making raw HTTP calls to Vault's API, you get typed methods and objects.
Apache 2.0, C#. Covers the full Vault API: secret engines (KV, Transit, PKI, databases), auth methods (AppRole, Token, LDAP, Kubernetes), and system operations. Supports both Vault Community and Enterprise features.
Fully free. This is a client library: no hosting, no service, no paid tier. NuGet install and use.
The catch: this is a niche library for a specific integration. You need HashiCorp Vault already running (which has its own cost and ops story). VaultSharp just makes talking to it from C# easier. If you're not in the .NET ecosystem, this isn't relevant. If you are, it's essentially the only maintained Vault client for C#, so the choice is this or raw HTTP. At, the community is small, don't expect instant answers to edge case questions.
Free vs Self-Hosted vs Paid
fully freeFully open source under Apache 2.0. Client library: no hosting cost, no paid tier. Install via NuGet. The only cost is whatever you pay to run HashiCorp Vault itself.
Free. A library, not a service. Your Vault infrastructure is the cost center.
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