Industry
FinTech
Case Study
ETF Investment Calculator
Long-term investing is difficult to understand from a single final number. I built a mobile calculator that shows how contributions, growth, dividends, and costs change the result over time.
Project Overview
Investment calculators often return one large number without explaining how it was reached. That makes it difficult to compare assumptions or understand which input changed the outcome.
I built a mobile app that makes long-term ETF scenarios easier to explore and explain.
A multilingual mobile app for exploring long-term ETF scenarios through clear inputs, comparisons, and educational context.
Services
- UX/UI Design
- Web Development
- Product Strategy
- Mobile Development
Key Deliverables
- Responsive Design
- Custom Development
- User Experience Improvements
Platform Type
Mobile Application
Tech Stack
- TypeScript
- React Native
- Expo
The Challenge
People need to compare recurring and one-time investments, different time horizons, expected growth, dividends, and costs. Putting all of that into one form can quickly become overwhelming.
Financial output also needs careful wording. A projection should help someone think, not pretend to predict the market.
Approach
I kept the calculation engine separate from the mobile interface so formulas can be tested without rendering a screen. Primary inputs stay visible, while secondary assumptions remain available when needed.
Results are broken into understandable parts and supported by short educational explanations in Serbian, German, and English.
The Solution
The app lets people adjust an investment scenario and immediately see how the result develops over time. Charts and comparison views explain the relationship between invested capital and projected growth.
Presets make it easier to start, while detailed controls support deeper exploration.
Key Challenges
-
presenting several financial assumptions without overwhelming the user
-
keeping calculations testable and independent from the interface
-
explaining projections clearly across three languages
The Outcome
The result is a focused mobile tool that turns a dense financial model into a sequence of understandable decisions.
Context
The most important design choice was not adding more numbers. It was showing the few numbers that help someone understand what changed and why.