Is Nucleo a subscription or a one-time payment?
The Nucleo application can be downloaded for free and can be used (optionally) without the Nucleo icons. We don't sell the app, you can use it free forever 🙂.
The Nucleo icons are a premium set of icons optimized for the Nucleo app. The purchase of the Nucleo icons is not a subscription, but a one-time payment.
After the purchase of the icons, you can unlock them inside the app by logging in with your account credentials.