A Keygen alternative for .NET licensing

Yes — if you’re evaluating Keygen for a .NET application and want a more .NET-native option, Keyright is a strong alternative. Both are licensing platforms that issue keys, enforce activations and support signed license files; the difference is emphasis. Keygen is a mature, language-agnostic licensing API you talk to over HTTP. Keyright is a .NET-first licensing platform with drop-in SDKs, built-in entitlements and tiers, self-service trials, and an offline-first design — from a team that also builds Nebula.NET. Here’s a straight, fair comparison.

Where Keygen is strong

Keygen has earned its reputation, and we’re not going to pretend otherwise:

• A clean, well-documented HTTP API. Keygen is API-first, so any language that can make a request can license against it. That neutrality is a real asset for polyglot shops.
• Cryptographic, offline-capable licenses. Keygen can issue signed license keys and files that verify without phoning home — genuine offline support, not an afterthought.
• Self-hosting available today. Teams that must run the licensing service inside their own infrastructure can do that with Keygen now.
• A large, established ecosystem. Years of production use, broad platform coverage and a deep body of documentation.

If you want a language-neutral licensing API and self-hosting is a hard requirement on day one, Keygen is a well-built choice.

Where Keyright differs

Keyright tackles the same job — “let my software check whether it’s licensed, and give me a place to issue and manage those licenses” — with a few different bets, most of them pointing at .NET teams.

• .NET-first, with a drop-in SDK. Keyright ships Keyright.NET: you configure it with your product slug and an embedded public key, and a few lines verify a license, activate a node-locked seat, and read entitlements. It fails closed to the unlicensed state if verification fails or a key is revoked. Node, Python and Java SDKs cover the rest of your stack, and the license/activation format is a documented HTTP + signature scheme you can verify from any language.
• Offline-first by design. Your app embeds a public key and verifies a signed license file’s signature locally — so licensing works fully air-gapped, with an optional grace window for online re-checks. Online activation is there when you want seat enforcement and revocation, but nothing forces a network call.
• Entitlements and tiers built in. Ship one binary and unlock features per plan with signed entitlements the SDK reads locally — no bespoke feature-flag plumbing on your side.
• Per-tenant RSA signing keys. Every account gets its own isolated key pair; your signatures never share a key with another vendor. The private key stays server-side, stored AES-256-GCM–encrypted under the service KEK.
• Self-service trials in one call. A single POST /v1/trial from your own marketing site issues a time-limited key — trials auto-expire, are fully revocable, and convert to paid without re-keying. No license emails by hand.
• A customer self-service portal. Your customers view keys, manage seats and download offline files themselves — fewer support tickets for you.
• A genuine free tier. The Free plan is $0 forever (up to 50 active licenses across one product, no card), so you can ship real licensing before you spend anything.
• Nebula.NET compatibility. If you already protect your binaries with Nebula.NET, Keyright’s licensing is wire-compatible with Nebula’s checks — one story for obfuscation and licensing.

Side by side

	Keygen	Keyright
Model	Language-agnostic licensing API	.NET-first platform with multi-language SDKs
Offline signed licenses	Yes	Yes (offline-first: verify locally against embedded key)
Online activation / node-locking	Yes	Yes
Seats & seat transfer	Yes	Yes (self-service deactivation)
Entitlements / feature tiers	Yes	Yes (signed, read locally by the SDK)
Per-tenant signing keys	— (varies by setup)	Yes, isolated RSA key pair per account
Self-service trials	Build it on the API	Built in (one API call)
Customer portal	—	Built in
Self-hosting	Available today	Hosted SaaS; self-host on the roadmap
Free tier	Check current plans	Yes — $0 forever, up to 50 active licenses
.NET SDK	Community/third-party options	First-party Keyright.NET

(Competitor capabilities can change — confirm current details on Keygen’s own site before deciding.)

Where Keygen may still be the better fit

We want this to be an honest comparison, not a sales pitch. If you must self-host the licensing service inside your own infrastructure today, Keygen supports that now; Keyright is fully hosted SaaS, with a self-hosted option on the roadmap rather than shipping. And if your stack is a long way from .NET and you’d rather integrate a purely neutral API than adopt a first-party SDK, Keygen’s API-first design is a natural home. Pick the tool that matches how you actually build.

How to decide

Don’t decide on a feature grid — decide on your integration. Wire a representative build against each, issue a license, and test the paths that matter: verify a signed file with the network unplugged, hit the seat limit, revoke a key and confirm your app drops to the free state on the next check. If your product is .NET, you’ll feel the difference in how few lines it takes and how much (entitlements, trials, a customer portal) you didn’t have to build.

Keyright’s Free plan lets you do all of that before paying a cent. Read the Keyright overview, follow the getting-started guide, and put it head-to-head with your current shortlist.