Why Billy Features Finance Fitness AI Team Get Started

Meet Billy

Your household's AI-powered companion for finance and fitness. Track expenses, plan meals, manage budgets — together, as a household.

But why?
Explore Finance Explore Fitness
Sound Familiar?

We've All Been There

Real problems. No workaround. Until now.

01

The Paycheck Puzzle

Finance

You got paid. Nice. But what's left after taxes, pension, health insurance? You do the math once and forget the numbers by next month. Now add complexity — you work abroad, salary in Swiss Francs, but your rent, insurance, and Netflix are all in Euros. What's the real share? And your partner has their own income too. Two salaries, different currencies, one household — and somehow you need to figure out what you can actually spend this month. Oh, and which subscriptions are you even paying for?

Billy: Add your incomes — gross salary, every deduction broken down (tax, pension, social insurance — percentage or fixed). Billy calculates your net. Working in CHF but living in EUR? Live exchange rates handle the conversion. Two incomes? Add both. Set up your household fixed costs — rent, utilities, insurance, subscriptions — all categorized. Then open the dashboard: a Sankey flow diagram shows exactly where every cent goes, from gross through government deductions to net, from net through fixed costs to what's actually left. And yes — all your subscriptions are finally in one list.
02

The Bookmark Graveyard

Fitness

Your browser "Recipes" folder has 200+ bookmarks. Half the links are dead. And grandma's handwritten Gulasch recipe? A photo on your phone, slowly buried under screenshots. You want to cook something nice tonight but spend 20 minutes scrolling through chaos instead. There's no single place for your recipes.

Billy: Paste a URL — AI scrapes the recipe. Upload grandma's photo — AI reads the handwriting. Ingredients, instructions, nutrition — all structured, all searchable, all yours.
03

The Receipt Drawer

Finance

You come home from shopping, receipt crumpled in your pocket. You tell yourself you'll log it later. You won't. Three months in, you have no idea where 40% of your money went. Manually typing every purchase into a spreadsheet? That's not tracking — that's punishment. So you stop entirely.

Billy: Snap a photo. AI reads the receipt — store, items, amounts, categories. Transaction created. Done. No typing, no spreadsheets, no guilt.
04

The Ingredient Gamble

Fitness

You work out. You meal-prep. But your prep is basically "chicken, rice, broccoli — repeat." Last Tuesday you improvised something with leftover ingredients and it was actually good. But how many calories? How much protein? You have no idea if your "healthy" day was secretly 3000 kcal of hidden cheese and surprise oil.

Billy: Add your ingredients — AI calculates the macros. Against all odds it tasted good? Save it as a meal. Reuse it. Share it with your household. No more nutritional guesswork.
05

The Macro Mystery

Fitness

You know those fancy fitness apps — active days, sedentary job vs. active job, bulk or cut, how many calories and protein you actually need? You've Googled "TDEE calculator" more than once. But the result never connects to what you actually eat. It's just a number floating in the void.

Billy: Configure your profile — activity level, goals, body stats. Billy calculates your daily targets for calories, protein, carbs, fat, and water. Then it tracks what you eat against those targets in real time. The ring fills up. The macro bars move. You know exactly where you stand — every meal, every day.
Core Concept

Built Around Your Household

Billy isn't just for you — it's for your entire household. Create a home, invite your people, and manage finances and nutrition together.

Create a Household

Set up your home in seconds. Define your currency, set a monthly budget, and start organizing your financial life.

Add Your People

Invite family members or roommates. Assign roles (Owner or Member), manage who sees what, and collaborate on finances and meals.

Two Apps, One Home

Switch between Finance and Fitness with one tap. Shared household data powers both — incomes feed budgets, members get personalized meal portions.

Finance

Your Money, Visualized

From household incomes to daily coffee — Billy tracks it all. Configure your costs, see where the money flows, and stay on top of your budget.

Dashboard

See your money flow at a glance. A Sankey diagram traces income through deductions to your budget. Doughnut charts break down spending by category. KPI cards show what's left.

Core

Household Costs

Configure fixed monthly costs — rent, insurance, subscriptions, utilities. Categorize them, see totals, and understand your baseline expenses before spending a cent.

Core

Income Management

Add multiple incomes per household. Define gross salary, tax deductions (percentage or fixed), and see net income auto-calculated. Multi-currency support with live exchange rates.

Core

Expense Tracking

Quick-add transactions with smart category suggestions. Type "Aldi" and it knows it's grocery. Browse history by day, week, or month. Repeat recent purchases with one tap.

Core

AI Receipt Scanner

Snap a photo of any receipt. AI extracts the store, items, amounts, and category — then auto-creates transactions. Upload images or PDFs, get structured data back.

AI-Powered

Open Banking

Connect your bank accounts via SaltEdge. Transactions are auto-imported and categorized. No more manual entry — your spending data flows in automatically.

Integration
Fitness

Feed Your Household Right

Plan meals for everyone. Track calories and macros per person. Let AI generate meal plans and calculate nutrition — so you can focus on cooking.

Daily Nutrition Tracker

A beautiful calorie ring shows your daily progress. Four macro bars track protein, carbs, fat, and water. Log food with ingredients, see real-time nutrition updates. Weekly overview with color-coded day status.

Core

Meal Prep & Recipes

Build your recipe library. Create meals manually, scan recipes from any URL, or upload an image. AI extracts ingredients, instructions, and nutrition data. Save and reuse your favorites.

AI-Powered

Meal Planning

A weekly 7x3 grid — breakfast, lunch, dinner for every day. Pick from saved meals or let AI generate suggestions. Swipe right to keep, left to skip. Tinder for your meals.

AI-Powered

Household Portions

Assign meals to specific household members. Billy auto-splits portions equally or by custom ratios. Each person's nutrition is tracked individually — same meal, personalized macros.

Core

AI Nutrition Enrichment

Don't know the macros? Billy does. AI standardizes ingredient names, calculates per-ingredient nutrition, and enriches recipes with tags, descriptions, and cooking instructions automatically.

AI-Powered

Water Tracking

Stay hydrated. Quick-add 250ml with one button, choose presets (500ml, 750ml), or enter custom amounts. Daily water goal tracking with a clean progress bar.

Core
Intelligence

AI at the Core

Billy uses AI where it matters — not as a gimmick, but as genuine time-savers that handle the tedious parts of tracking your life.

Receipt OCR — Snap & Extract
Recipe Scraping — URL to Meal
Nutrition Calculation
Meal Plan Generation
Ingredient Standardization
Smart Category Suggestions
Stack

Under the Hood

No over-engineered SPA. Just solid server-rendered views, a real database, and services that do one thing well.

.NET 10
PostgreSQL
Entity Framework Core
Wolverine CQRS
Keycloak
Chart.js
Bootstrap 5
MinIO
SaltEdge
LiteLLM
Flask API
Razor Views
The Builder

One Dev. One Raccoon. Zero Deadlines.

Kaptn Karacho

Software Dev → Manager → It's Complicated

My days are somewhere between sprint plannings, board meetings, and figuring out how to turn ideas into products that might actually make money. Should I manage? Should I code? Should I plan? Yes. Billy is what happens when I stop answering that question and just build something.

Billy started with a simple problem: I had no idea where my money went. I love cooking, I train a lot — and then I got into a happy relationship, discovered what a dad bod looks like way too early, and figured: why not track all of it in one place? It's also a playground to retrain my dev muscles and test how AI can actually be used in the field — not as a toy, but as a real tool for building software.

I'm also a nice guy. If you like this project, have questions, or just want to say hi — get in touch.

   This is a private build & learning project. Not a commercial product. Expect rough edges, experimental features, and a raccoon that judges your spending habits.