Fintech
SIP vs Lump Sum Visualizer
See how investing monthly compares to investing at once over history
Beginner8h1
Next.jsECharts
17/20Retirement Monte Carlo Simulator
See the probability your savings plan lasts through retirement.
Intermediate14h1 person16/20 fit
Build Retirement Monte Carlo Simulator for people in their 20s and 30s in ~14h with 1 person. Stack: Python + Pyodide + ECharts.
Why it wins: Real statistics with an engaging chart.
Build flow
01 · Problem
Single-number retirement calculators hide uncertainty.
02 · Solution
Run thousands of simulated market paths with inflation, show a fan chart and the chance of running out, and test changes.
03 · Build
- 1Model returns
- 2Simulate in the browser
- 3Chart percentiles
- 4Add sliders
04 · Demo
Raise monthly savings and watch the success probability jump.
MVP checklist
- Monte Carlo paths
- Fan chart
- Success probability
- What-if sliders
Tech stack
| Tech | Role | |
|---|---|---|
| Python | Backend / scripting | Backend |
| Pyodide | Python in the browser | Tool |
| ECharts | Interactive charts | UI |
Reference repos
Open-source projects you can build on. Links checked 2026-10-31.
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