All templates stay free. The only paid upgrade is the custom domain for a specific app. Pay once for 30 days or 1 year, then renew manually when needed. If the paid period expires, the app falls back to its free WebAppInSeconds URL.
Perfect for building, testing, and publishing without a custom domain.
One-time payment. Extends the custom-domain access by 30 days. Renew manually later if you still want the custom domain live.
One-time payment. Extends the custom-domain access by 1 year for this app.