Zebrasplit — split trip expenses, settle up in Venmo
Identifiers that keep the old names on purpose. The product is Zebrasplit (zebrasplit.com, scheme zebrasplit://, since 2026-10-13; Bunktab before that, Checkm8 before that). The iOS/Android bundle id com.bunktab.app, the Expo slug bunktab, the EAS project @brad.russell1/bunktab, the npm workspaces @bunktab/*, the App Store Connect record and the push key are internal and stay as they are, like the checkm8.internal setting, Vault secret and x-checkm8-secret header. Old schemes and domains keep working: bunktab:// and checkm8:// are still accepted, and bunktab.com / check-m8.io redirect to zebrasplit.com.
A group logs shared trip expenses, everyone taps Done, and close-out
opens Venmo with each payment pre-filled, using the fewest payments possible.
The spec is docs/zebrasplit-spec.md. The original Checkm8
spec is kept as history in docs/archive/.
Layout
| Path | What |
|---|
apps/mobile | Expo (React Native) app, iOS + Android, expo-router |
packages/core | Pure logic: money, split types, lodging nights, settlement, Venmo links, categories, currency. Tested with vitest. No I/O. |
packages/theme | Design tokens: the Pretty Good kit's roles re-coloured with Basalt & Spore |
supabase/ | Postgres schema, row-level security, RPCs, storage policies (migrations/), Edge Functions (functions/) |
apps/web | Next.js web guest view + landing page (phase 5, not yet created) |
Run
npm install
npm test # packages/core
npm run typecheck # every workspace
cp apps/mobile/.env.example apps/mobile/.env # add the anon key
npm run mobile # Expo dev server; scan the QR with Expo Go
Database
npx supabase login
npx supabase link --project-ref qywowvkkkxldgxoatdsh
npx supabase db push # applies supabase/migrations
Keys never enter the repo. The anon key goes in apps/mobile/.env; the
service role key only in Supabase and Vercel environment variables.
Rules
- Money is integer cents everywhere.
- Spore Chartreuse means "tap this" and nothing else.
- Every table has row-level security; a user sees a trip's data only as a
member of that trip. Split and payer sums are re-checked in the database.
- The Venmo link format is undocumented; it lives in one function
(
packages/core/src/venmo.ts).
