KuaiJi is a privacy‑first local ledger focused on group bill splitting and personal bookkeeping. It offers personal and shared ledgers: quick entry, category tags, and clean monthly/yearly stats to reveal spending trends. For groups, one‑tap AA, I pay/they pay, or fully custom ratios automate settlement for dinners, trips, and house‑sharing. To protect privacy, the app has no server—everything is stored on your device. When sharing is needed, sync nearby over Bluetooth or Wi‑Fi with no accounts; sessions use system‑level encryption. CSV export and full backup/migration are available. Supports long‑press quick actions and Shortcuts, with English/French/Chinese and light/dark appearance. Simple, reliable, and clean.