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Kalc
NATIVE MACOS 14+ / ZERO TELEMETRY

Kalc

A calculator that thinks in lines.

Kalc turns plain-language notes into exact, live results. Write the expression once. Keep every assumption in view.

Download for MacTry the playground

Free to start. Universal binary for Apple silicon and Intel.

Kalc — Scratchpad
Click to edit
Kalc for macOS showing currency conversions and dates with aligned results.

Illustrative values. The app evaluates locally.

Natural Syntax

Write freely

Notes, variables, dates, and formulas share one plain-text surface.

1:1 Line Sync

See every result

Each line evaluates in a synchronized gutter as you type.

< 8.0ms Frame Budget

Keep it exact

Decimal math, dimensions, and currency conversions stay deterministic.

LIVE DEMO / LOCAL SIMULATION

Type a thought. Get a result.

Kalc is deliberately free-form. Try a conversion, a date, or a tiny model. The answer appears without leaving the line.

$922.25
$780.00
1,568.62 EUR
Example rate: 1 EUR = 1.085 USD
Download the native app
Subsystems

One surface for the messy middle.

Exchange-rate examples on this page are illustrative fixtures.

Natural language, with structure

Temporal Engine

Ask for the date, duration, pace, tax, or percentage in the words you already use.

>today + 15 business days -> 30 September

Dimensions that travel together

Dimensional Catalog

Convert length, mass, time, data, temperature, speed, and more without losing the unit.

>1 m 20 cm -> 1.2 m

Currencies without the tab sprawl

Exchange Rate Store

Use 170+ currencies and crypto codes in the same note, with offline bundled models and visible freshness.

>850 EUR in USD -> $922.25
Integrity by Design

Trust the number. Keep the note.

DECIMAL ARITHMETICZero Floating Point
IEEE 754 Float0.30000000000000004
Kalc Exact Decimal0.1 + 0.2 = 0.3

Decimal representation and half-even rounding keep everyday financial calculations predictable.

38+ decimal digits of significand precision with banker's rounding.

Private by default

100% Offline

Kalc computes locally. No keystroke analytics. No remote calculation service. The optional daemon binds to 127.0.0.1.

  • Offline math and unit conversion
  • Plain-text .kalc files
  • Zero telemetry
  • Loopback-only integrations
No analytics. No cloud accounts. No network sockets for evaluation.
MULTI-TAB WORKSPACE

Small models, without spreadsheet gravity.

Keep assumptions in one tab and reference them from another. Kalc tracks dependencies, updates downstream lines, and surfaces cycles instead of hiding them.

expenses=
$92,800.00
net=Income@annualGross-expenses
$94,200.00
Try editing expenses above to see reactive calculation cascading.
DAG dependency closure activeSee cross-tab syntax →
Headless & CLI Tools

Fits the tools you already use.

Use the same calculation core from a shell pipeline, Raycast, Alfred, or a local script.

kalc-cli
$ kalc-cli '20 inches in cm'
50.8 cm

$ printf 'a = 50\nb = 20\na * b\n' | kalc-cli --last
1000
Read the CLI docs→
POST 127.0.0.1:15055/calculate
// Request body
{
  "input": "$100 + 15% in EUR"
}
// Illustrative response
{
  "status": "ok",
  "result": "105.80 EUR",
  "precision": 2
}
Read the daemon docs→
Workflow Scenarios

Built for the tiny calculations that add up.

Plan a day

Live Example

Turn "after lunch, plus three hours" into a time you can act on.

9:30 am + 3 hours 45 min= 1:15 pm
Transparent Plans

Start free. Follow what comes next.

Free download

$0 Free

Kalc will offer a free tier. The feature breakdown will be published with the release.

Download for Mac

Pro

Roadmap

An AI assistant, advanced extensibility, and sync are planned. Features, pricing, and release dates are not final.

Pro details

Core calculation syntax works without an AI assistant. Pro details will be published before purchase is available.

Questions & Answers

Frequently Asked Questions

Instant Download

Make the next calculation a note.

Download Kalc and keep the expression, the assumptions, and the answer together.

Download for Mac

macOS 14+ / Apple silicon and Intel / Free to start