Cashn't

A budget tracker that gives you one honest number: what is safe to spend today. With an AI money coach built from your real numbers.

Founder, sole engineer & designer · 2026 · Designed, built and deployed by Alexus Karl Joaquin.

What I built

• "Safe to spend today" engine computes one daily number from balances, bills, paydays and savings goals.
• AI money coach: ask "can I afford this?" in plain language and get a plan generated from your actual financial data. Production LLM integration, not a demo.
• Net worth across cash, banks, e-wallets (GCash, Maya), investments and crypto; recurring bills and payday detection; envelope-style trip budgets; group pots with automatic who-owes-who settlement.
• Privacy as a feature: local-first guest mode, Face ID lock, privacy masking, in-app account deletion, published privacy policy. Passed App Store review on the first submission.
• Custom sync API on Railway: Apple / Google / email sign-in, cross-device snapshot sync, group spend endpoints.
• Runs the whole product operation solo: App Store optimization, release management (v1.1 shipped within days of launch), pricing and roadmap.

Skills demonstrated

• React 19
• TypeScript
• Vite
• Capacitor 8 (iOS + Android)
• Firebase Authentication (Apple / Google / email)
• Express.js REST API
• PostgreSQL
• Local-first sync architecture
• PWA & custom service worker
• Recharts data visualisation
• Design systems & CSS tokens
• LLM integration (AI coach)
• Biometric auth (Face ID)
• Local notifications & haptics
• Xcode + App Store Connect API automation
• App Store review & privacy compliance
• Railway deployment
• Release management & ASO

Stack

Screens

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