Shared care calendar for horse owners

The idea

A horse’s care schedule is genuinely distributed: the owner books the vet, the barn manages feed and turnout, a half-leaser rides Tuesdays, and the farrier shows up every six weeks if someone remembered to book him. Coordination today is a whiteboard in the tack room and three text threads, and the failure mode is a missed worming rotation or a farrier cycle stretching to nine weeks.

The wedge is recurring care cycles that reschedule from completion, plus SMS for the half of the care team who will never install an app. Making the horse the shared object, with per-role permissions, is what generic family calendars cannot model.

Who pays

The buyer is the owner, for whom horses cost 500 to 1,000-plus dollars a month before anyone mentions vet bills; 8 dollars a month is invisible and covers unlimited horses and free team members. Half-lease arrangements make shared visibility a real need rather than a nicety. Distribution: boarding barns (one enthusiastic barn manager onboards twenty owners), equestrian Facebook groups, and farriers who benefit from clients being on schedule.

MVP scope

• Horse profiles with phone-number care teams and role-based permissions
• Recurring care cycles (farrier, vaccines, worming rotation) rescheduling from completion date
• Push plus Twilio SMS reminders, with SMS DONE replies marking tasks complete
• Barn Day agenda across all horses at a barn
• Skip for v1: billing between parties, feed charts, competition calendars, health record attachments

Build Paddock, a React Native (Expo) shared care calendar built around the horse, not the person, because a horse's care is split across owner, half-leaser, barn staff, farrier, and vet.

Horse profile: name, photo, barn, and a care team: each member is added by phone number with a role (owner, leaser, barn staff, professional). Members get share-level permissions: owners edit everything, leasers and staff can view and complete tasks, professionals see only their own appointments.

The core object is the recurring care cycle: farrier every 6 weeks, vaccines on a schedule, worming rotation (with product rotation notes), dentist annually, physio, and custom cycles. Completing an occurrence auto-schedules the next from the completion date, not the due date, which is how farrier scheduling actually works. Cycles can drift and the app shows overdue in red.

Notifications: push for app users, SMS via Twilio for members who never install anything (farriers, older barn staff): a reminder 3 days out and a morning-of message to whoever is marked on duty. SMS replies of DONE mark the task complete.

Barn Day view: an agenda across all horses at one barn, so staff see today's list in one screen.

Screens: My Horses, Horse profile with care timeline, Cycle editor, Barn Day agenda, Team management.

Stack: Supabase (auth by phone OTP, Postgres with row-level security per horse), Twilio for SMS. Pricing: 8 dollars per month per owner, unlimited horses and team members free.