Overview

Dual-mode Android finance app: Ledger + CalcHub (33 calculators). Share a ledger via 6-digit secret code, watch entries sync live over Supabase WebSockets.

Key Highlights

• Real-time WebSocket sync via Supabase Phoenix Channels (no polling)
• 6-digit secret-code folder sharing — read-only or full-access
• Calculator history auto-saves without pressing = (2s debounce)
• Audit trail with actor badges inline
• 33 financial calculators: SIP, EMI, FD, PPF, EPF, GST, HRA, XIRR, ...
• Room v3 with three migrations, offline guard, auto-reconnect
• Glass-morphism UI, 7 fonts, 10 currencies

Tech Stack

Architecture

Built natively in Kotlin + Jetpack Compose with a glass-morphism Material3 design language. Local persistence is Room v3 with three migrations; remote sync uses Supabase Postgres + Phoenix Channels WebSockets (not polling) for instant INSERT/UPDATE/DELETE propagation to all members. Includes a full audit trail (📝 edited / 🗑️ deleted actor chips), auto-reconnect with exponential backoff, and offline guards for shared folders. CalcHub delivers 33 financial calculators in the same APK (SIP, EMI, FD, PPF, EPF, RD, NPS, SWP, GST, HRA, XIRR, …).