Juan Saravia ESEN

Work · Fintech · AI app

FinWise

Personal finance that logs itself: purchases come in from Apple Pay, your bank, Siri or Gmail, and FinWise tells you how much you can spend today.

FinWise, screen 1FinWise, screen 2
Logged itself · Uber $18,400$138,700 a day to spend
RoleDesign · Full-stack · AI
Year2026
StatusIn production

Overview

FinWise answers one question: how much can you spend today without wrecking the month. Its Real Number takes your income, subtracts fixed costs, savings for your goals and what you have already spent, and spreads the rest across the days left.

Purchases come in on their own from Apple Pay, bank text messages, Siri or Gmail, with no bank connection and no duplicates. And Sofía, its AI advisor, answers only from your own numbers: whether you can afford it, where you stand and what happens if you cancel something.

Features

What it does.

Real Number

What you really have left this month, and how much per day.

Logs itself

Apple Pay, bank text messages, Siri or Gmail. If a purchase arrives twice, it is logged once.

Sofía (AI)

Answers “can I afford it?” with your fixed costs, cards and goals.

Goals, cards and fixed costs

How much to set aside, how much credit is left and when each card closes.

Any currency

Pesos, dollars or euros, at the daily exchange rate.

How it works

From start to finish.

  1. You pay

    With Apple Pay, card or cash, as usual.

    iOS Shortcuts
  2. It logs itself

    It arrives via Apple Pay, the bank text, Siri or Gmail.

    Gmail · Siri
  3. AI understands it

    Reads voice and receipts: amount, merchant and category, no duplicates.

    Claude · Whisper
  4. Real Number

    Income minus fixed costs, goals and spending, spread over the days left.

    Supabase
  5. You ask Sofía

    Answers "can I afford it?" using only your own numbers.

    Claude

Screens

How it looks.

Tech specs

How it is built.

Frontend

  • HTML/CSS/JS
  • PWA offline
  • localStorage

Backend

  • Vercel Edge
  • Supabase · Postgres
  • RLS + JWT
  • Cron

AI & integrations

  • Claude Sonnet 4.6
  • Groq Whisper
  • Claude Vision
  • iOS Shortcuts

Integrations

  • Anthropic Claude — chat, voice parsing and receipt OCR
  • Groq Whisper — speech-to-text (large-v3)
  • Supabase — auth (email, Google, Apple) and real-time data
  • iOS Shortcuts — Apple Pay and Siri log every purchase instantly
  • Gmail — receipts and bank alerts that come in on their own

Method

  • 8 versioned SQL migrations · Playwright audit suite (46 screenshots) · auto-generated store screenshots · continuous deploy with GitHub Actions · a foundational doc as context to steer the AI.