Felt Plus is for people sending 1-3 cards a month. Felt Pro is for those folks who typically send more than 3 cards a month. Both subscriptions receive 3 cards with up to 4 frames each month (value of up to $18). The Pro Subscription also receives 40% off credit-packs, plus a free custom card or photo frame with a logo, or personal design like a monogram. The Pro subscription is not available on Android at this time. Coming soon!