**ABAK** is a precision calculator built for leveraged trading — crypto futures and perpetuals (Binance, Bybit, OKX, etc.) in isolated-margin mode.

No more manual calculations. Enter your position details and instantly get liquidation price, break-even, ROE, and PnL — with fees already factored in.

### Core Features

**INITIAL**
Calculate everything about your first position in one screen.
- Liquidation Price, Break-Even, Net ROE, Net PnL, Quantity, Margin, Cash
- Drag any result card to the input zone to reverse-calculate
- Target ROE → find the exit price you need
- Target Liq Price → find the implied leverage
- Target PnL → find the exit price you need

**ADD — +POSITION**
Stack additional entries onto your position (DCA, scaling in/out).
- Total Average Price, Total Liq Price, Total ROE, Total PnL and more
- Direct mode: enter add price and amount manually
- Target modes: reverse-calculate to a Target Avg, Liq, or BEP
- Stack multiple cards with order-independent accumulation

**ADD — +MARGIN**
Add collateral only, without changing position size.
- Enter extra margin → see new liquidation price
- Enter target liquidation price → see required margin

**SUMMARY**
Combined result across INITIAL and every ADD card — total quantity, average price, liquidation, BEP, PnL, ROE, and effective leverage at a glance.

**POSITION GRAPH**
Two-tab visualization of your position. Works in both ABAK and KABA.
- History: average price, liquidation, PnL per step, effective leverage with max-leverage warning, and cumulative margin
- Scenario: PnL curve by exit price, with guides at average, BEP, and liquidation
- Drag across the chart to scrub values with a live tooltip
- Per-step state table — avg, qty, margin, liq, liq cushion

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### Key Highlights

- **Drag & Swap interface** — long-press any card to move it between input and output zones
- **MMR Tier Table** — enter your exchange's full bracket schedule for accurate liquidation prices, with per-coin presets
- **Max Leverage warning** — banner alert when your effective leverage exceeds the tier's max
- **Split Fee mode** — set buy and sell fees separately
- **Preset system** — save and restore your exchange settings instantly
- **Diary** — built-in trading journal with calculator snapshot import
- **Memo In / Memo Out** — save and load input values anytime
- **Export / Import Backup** — full data backup as a single JSON file
- **Dark / Light mode**
- **Fully offline** — no account, no sign-up required

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### KABA — Stock Spot Mode

Tap the title at the top of the screen to switch into KABA, a companion mode for stock spot trading.

- Integer share quantities with automatic floor rounding
- "Unspent (floor)" shows leftover cash after quantity flooring
- Split fees support local taxes (Korean transaction tax, UK Stamp Duty, Indian STT, US SEC/TAF, etc.)
- No leverage, no liquidation — straightforward buy-and-sell position tracking
- Memos are kept separate between ABAK and KABA

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### ETF Simulator — Leverage Decay Visualizer

See how leveraged and inverse ETFs drift from their underlying due to daily compounding (volatility decay).

- Enter start price, leverage, and a sequence of daily returns
- Cumulative paths for underlying (1x), leveraged (Nx), and inverse (-Nx) on one chart
- Add, remove, or clear entries with live updates
- Leverage change prompts a reset confirmation
- Colors follow your Red Up / Green Up setting

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### Accurate Calculations

- Uses the isolated margin liquidation formula (Binance USDT-M standard)
- Net ROE and Net PnL include both entry and exit fees
- Break-Even accounts for round-trip fees
- All calculations run locally on your device

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### Notice

Results are for reference only. This app uses isolated margin formulas and does not account for cross-margin, funding costs, or slippage.