Is there a subscription for Halo Lytt?

No. Halo Lytt has no subscription and no recurring cost.

There is nothing to subscribe to, because there is no cellular service to pay for. Subscriptions on kids wearables exist to cover a mobile data connection for calling, messaging and live location. Halo Lytt has none of those features, so it has no monthly fee.

Connected alternatives do: Fitbit's Ace Pass is $9.99 per month or $120 per year, and Garmin's kids smartwatch plans are $9.99 per month. If you stop paying those, calling and location stop working.

See the full two-year cost breakdown.