Your AI-powered investment companion. Backtest strategies, track your portfolio, and compete on the leaderboard — all in a sleek, cyberpunk interface.
| Home | Mars Strategy | Compound Chart | Portfolio Insights | ETF Hub |
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Marffet is a web-based investment simulation and portfolio management tool that proves "time in the market beats timing the market." Watch 20+ years of Taiwan stock history unfold in dynamic visualizations, compare your performance against proven strategies, and get AI-powered insights.
- URL: https://marffet-app.zeabur.app
- PWA Installation Note: When adding Marffet to your Home Screen (PWA), please ensure you do so from the Home Grid (
/) or your desired starting page. The PWA shortcut will persistently capture and launch the specific URL you were on during installation. - Login Required: To ensure peak performance and prevent heavy background loading, all features require you to Sign in with your Google Account.
- Guest Mode: Explore the simulator and visualizations without creating an account by clicking "Explore as Guest".
- Sign In with Google
- Explore "Mars Strategy" — see the top 100 stock survivors from 2006 to today
- Add Your Holdings in the Portfolio tab
- Watch Your Race — see your investments compete over time
- Customize your profile, nickname, and settings via the ⚙️ icon
The core of Marffet. Simulates 20+ years of investment history to find the Top 100 Survivors.
- Customizable: Set your Start Year, Initial Capital, and Annual Contribution
- Three Strategies: Compare Buy-At-Opening (BAO), Buy-At-Highest (BAH), and Buy-At-Lowest (BAL)
- Full Coverage: TWSE stocks, TPEx/OTC, Bond ETFs (e.g., 00679B), and Convertible Bonds
- Blazing Fast: Results in under 200ms thanks to DuckDB + vectorized computation
- Export: Download Top 100 data as Excel spreadsheets
A dynamic animated visualization of stock performance racing over time.
- Watch History Unfold: See which stocks rise and fall year by year
- Premium Feature: CAGR metric toggle for advanced analysis
Simulate long-term compounding with single stocks or compare multiple assets side by side.
- Single Mode: Calculate compound growth for one stock with dividends reinvested
- Comparison Mode: Put up to 3 stocks head-to-head
- Up-to-date dividends: Reinvested returns and yields always reflect the latest ex-dividend events
Manage your real investment portfolio with a sleek, "Webull-style" interface featuring full transaction history.
- Visual Allocation: ECharts donut charts and premium stats cards for quick insights
- Groups: Organize holdings into Dividend, Growth, Speculative, or custom categories
- Transactions: Log buys and sells with dates, shares, and prices
- Real-Time Sync: Pull current market data to calculate live P/L
- Responsive UX: 7-column stacked desktop view and cyberpunk framed mobile cards with smooth stagger animations
Your personal investment curve aligned with your transaction history.
- Net Worth Over Time: Visualize your portfolio growth month by month
- Dividend Tracking: Toggle dividend income as a separate chart layer
- Realized & Unrealized P/L: See both gains broken down
Your personal bar chart race — watch your own holdings compete against each other.
- Animated Playback: Play, pause, and scrub through time
- Quarterly Resolution: See shifts in your top performers each quarter
See how your ROI compares against other Marffet users.
- Global Rankings: Sorted by ROI percentage
- Public Profiles: View others' top holdings and allocation (without dollar amounts)
- Sync Stats: Update your ranking with one click
Specialized tools for Convertible Bond investors.
- Premium Monitoring: Track CB premiums and identify arbitrage opportunities
- Yield Hunter: Alerts when premium falls below -1% (buy) or rises above 30% (sell)
A focused board for Taiwan-listed active ETFs that compares each fund's NAV to its market price.
- Auto-curated: The universe is sourced from the official TWSE/TPEx ISIN registry (refreshed daily). When a new active ETF is listed, it shows up automatically.
- One-glance health: A green bar inside ±1% means the ETF is trading close to NAV. Amber means widening discount/premium worth attention.
- Switch the lens: Quickly flip between Active, Passive, Leveraged, and Inverse universes.
- Free tier: Yesterday's close NAV vs the same-day market close. Premium/VIP: live intraday tracking (rolling release).
An intelligent investment assistant powered by Google Gemini.
| Free Tier | Premium Tier | |
|---|---|---|
| Personality | Encouraging Educator | Ruthless Wealth Manager |
| Focus | Explains why buy-and-hold works | Active rebalancing advice |
| Advice | General education | Sell overheated stocks, buy oversold ones |
| Feature | Guest | FREE | PREMIUM | VIP |
|---|---|---|---|---|
| ETF NAV / Price | ❌ | ✅ T-1 (yesterday) | ✅ Live | ✅ Live |
| ETF Discount/Premium (折溢價) | ❌ | ✅ T-1 | ✅ Live | ✅ Live |
| ETF Yield (殖利率) | ❌ | ✅ | ✅ | ✅ |
| ETF Ranking / News | ✅ | ✅ | ✅ | ✅ |
| ETF Snapshot / Delta / Overlap | ❌ | ❌ | ✅ | ✅ |
| ETF Technicals / Compare / Calendar | ❌ | ❌ | ✅ | ✅ |
| ETF Sync-add / Add Radar / Sell Radar | ❌ | ❌ | ❌ | ✅ |
| Active-ETF Trust / Foreign Joint Net Buy-Sell Board | ❌ | ❌ | ❌ | ✅ |
| Mars Strategy | ✅ | ✅ | ✅ | ✅ |
| Bar Chart Race | Basic | Basic | Advanced (CAGR) | Advanced (CAGR) |
| Compound Interest (Single) | ✅ | ✅ | ✅ | ✅ |
| Compound Interest (Comparison) | 🔒 | 🔒 | ✅ | ✅ |
| Portfolio Tracker | ✅ (Local) | ✅ | ✅ | ✅ |
| Trend Dashboard | ❌ | ✅ | ✅ | ✅ |
| My Portfolio Race | ❌ | ✅ | ✅ | ✅ |
| Cash Ladder | ❌ | ✅ | ✅ | ✅ |
| Portfolio Groups | 3 max | 11 max | 20 max | 30 max |
| Targets per Group | 10 max | 50 max | 100 max | 200 max |
| Transactions per Target | 10 max | 100 max | 500 max | 1,000 max |
| AI Copilot | ❌ | 🎓 Educator | 🎓 Educator | 💼 Wealth Manager |
| CB Notifications | ❌ | ❌ | ✅ In-App | ✅ In-App + Email |
| Rebalancing Alerts | ❌ | ❌ | ✅ In-App | ✅ In-App + Email |
| Data Export | ❌ | 📦 Unfiltered | 📥 Filtered + 📦 Unfiltered | 📥 Filtered + 📦 Unfiltered |
| Server-Side Data | ❌ | ✅ | ✅ | ✅ |
| Priority Support | ❌ | ❌ | ❌ | ✅ |
| Early Access | ❌ | ❌ | ❌ | ✅ |
How to upgrade? Go to ⚙️ Settings → Sponsor Us → choose Ko-fi or Buy Me a Coffee. Your membership will be activated!
Love the Marffet Investment System? You can sponsor our development and unlock Premium or VIP features!
- Go to Settings ⚙️ and click the Sponsor Us tab.
- Choose your preferred platform to sponsor.
- Once sponsored, we will manually activate your Premium or VIP membership on your account.
- Found a Bug? Use the ⚙️ Settings panel in the app to report it
- Feature Request? Send your ideas through the same Settings panel
- Questions? Check the in-app documentation page (/doc) for a quick overview of all features
Built with ❤️ by the Marffet AI Team • v5.1