Kalc

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KalcFree-Form Computational Notepad for macOS

Natural language plain-text notation, multi-part dimensional unit arithmetic, arbitrary-precision decimal mathematics, and live line-by-line results.

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Functions Catalog
Why Zero Float?

Zero Float Invariant

Exact high-precision decimal arithmetic (KalcDecimal with 38+ significand digits) and Half-Even Banker's Rounding. No binary floating-point drift.

Sub-Frame Recalculation

Complete incremental recalculation under an 8.0 ms frame budget on 1,000-line documents (averaging 0.84 ms on Apple Silicon).

Multi-Sheet Computational Modeling

Live cross-tab variable referencing (Tab@variable) with reactive dependency cascades, deterministic cycle detection, and tab flashing animations.

Multi-Part Dimensional Units

Chain mixed unit increments across 10 base physical dimensions without explicit addition operators (e.g. 1 meter 20 cm in inches).

170+ Currencies & Crypto

Fiat currencies and cryptocurrencies (BTC, ETH, SOL) with offline-first local caching, background refresh, and historical US CPI inflation calculations.

Native macOS Architecture

TextKit 2 vertical line centering, interactive Option-drag number scrubbing, 4 Obsidian Kinetic themes, and global menu-bar popover.

See Kalc in Action ​

text
# Monthly Project Forecast
dev_rate     = $125 / hr
dev_hours    = 42 hrs
development  = dev_hours * dev_rate              // $5,250.00
servers      = 4 * $65/mo * 12 months            // $3,120.00
subtotal                                         // $8,370.00

tax          = 8.25% on subtotal                 // $9,060.53
discount     = 5% off prev                       // $8,607.50
total in EUR                                     // 7,933.53 EUR

# Travel & Logistics
flight       = 620 EUR in USD                    // $672.70
hotel        = $160/night * 4 nights             // $640.00
trip_total   = flight + hotel                    // $1,312.70
split trip_total tip 18% among 2 people          // Total: $1,548.99 ($774.49 / person)

📖 User Guide ​

Explore the notepad paradigm, keyboard shortcuts reference, editor code intelligence, and multi-tab workspaces.

⚡ Features & Architecture ​

Deep-dive into the Zero-Float Invariant, sub-frame performance benchmarks, native AppKit UI, and 100% offline privacy.

📐 Language & Calculations ​

Master operators, Pratt parser precedence, 10 base dimensions, 170+ currencies, 7 percentage patterns, and calendar math.

📚 Functions Reference ​

Complete reference cataloging Mathematical, Statistical, Financial, Developer, and Physical functions with verified examples.

🔌 Tools & Extensibility ​

Build custom JavaScript extensions (.kalcplugin), run terminal scripts with kalc-cli, or connect Alfred/Raycast to the HTTP daemon.

Native macOS Computational Notepad • Pure Swift with Strict Concurrency

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