CoinOs's implementation is NWC-only as far as I know. Here's the relevant (Core Lightning) code from their repo:
https://github.com/coinos/coinos-server/blob/master/lib/nwc.ts#L293-L330
https://github.com/coinos/coinos-server/blob/master/lib/payments.ts#L499-L534
Here's Alby Hub's LND implementation:
https://github.com/getAlby/hub/blob/master/nip47/controllers/pay_keysend_controller.go
https://github.com/getAlby/hub/blob/master/lnclient/lnd/lnd.go#L497-L589
The main ones that support NWC right now are v4vmusic.com, Castamatic, and StableKraft.app. Podverse is adding NWC to their 2.0 version. The other apps have historically used the Alby API directly, but we're working to get each of them to adopt NWC.