Keylight vs Cryptlex — the SDK-first alternative

Cryptlex is a solid cross-platform licensing engine — node-locked, floating, hardware-bound, the works. Keylight covers a different target deeper: finished SDKs for Swift, Rust, and JavaScript, with Stripe wired in. If you’re shipping on one of those stacks, that focus does more for you than breadth. The honest comparison:

What Cryptlex gets right

Cryptlex is built for range. LexActivator runs across Windows, macOS, Linux, and more, and the licensing models go well past the basics — node-locked, floating and concurrent seats, hardware-bound licenses, on-prem deployment. If you need floating licenses for a team tool, or a license welded to specific hardware, Cryptlex does that out of the box.

That breadth is real, and for some products it’s exactly the requirement.

Where Keylight is different

Cryptlex gives you LexActivator — a C-based SDK you bridge into Swift, Rust, or JavaScript. It works, but it’s not native, and the licensing state is still yours to manage.

Keylight ships finished SDKs for each stack. The Swift SDK is a state machine: checkOnLaunch(), then switch over .licensed, .trial, .expired, .invalid. The Rust and JavaScript SDKs follow the same model for Tauri, Electron, and Node apps. Offline checks run on Ed25519 leases verified locally, with feature flags signed into the lease. On payments, a Stripe charge mints the license with no webhook code from you; other providers connect by webhook. You’re not bridging a cross-platform SDK into your stack — you’re using one built for it.

When Cryptlex is the better pick

Be honest about it. If you ship across Windows and Linux from a platform Keylight has no SDK for yet — native C++ or .NET — Cryptlex’s LexActivator fits where Keylight is focused today. If you need floating or concurrent seats, or licenses locked to hardware, that’s Cryptlex’s home turf, not Keylight’s. And if on-prem licensing is a hard requirement, Cryptlex has it.

Keylight covers Swift, Rust, and JavaScript — not every platform. For floating seats or stacks outside that list right now, Cryptlex is the straighter line.

Where Keylight fits

Building in Swift, Rust, or JavaScript and want native, not bridged? Keylight. Finished SDKs, offline Ed25519 leases, Stripe-native minting, feature flags in the lease, multi-product and multi-tenant built in.

Plans start at $19/month, with a free tier. Test the whole flow before you pay.