Independent studio · Windows desktop

Software that respects your machine.

LK Software builds fast, offline, buy-once desktop apps for Windows. No cloud. No accounts. No tracking. Your files stay on your PC — always.

Works 100% offline No accounts, no telemetry Buy once — or free

The apps

Two tools, one workshop.

Small, sharp Windows apps that do one job unreasonably well.

FastSheet

Huge spreadsheet viewer

Open the spreadsheets Excel can't.

A native viewer for the Excel & CSV files that freeze Excel. Opens a completely full Excel sheet — 1,048,575 rows, 8.4 million cells — in about 13 seconds, fully on-device.

A full Excel sheet, opened in seconds
100% offline — data never uploaded

Launching soon $29 · one-time

See FastSheet

PinRail

Edge-dock launcher

Your apps, one flick away.

A quiet dock on the edge of your screen. Flick the mouse to the edge, it slides out; click to launch or focus. Pin apps, folders, drives — free.

Free forever · no ads · no account
Runs offline · ~2 MB installer

Download Free See PinRail

How we build

Principles, not features.

Offline by default

Your files never leave your PC. No servers to trust, nothing to upload. Verifiable with any firewall.

Buy once, keep it

One-time licenses, no subscriptions. The free apps stay free. No dark patterns, no upsell traps.

No accounts, no tracking

No sign-up, no telemetry, no analytics phoning home. You install it, you own it.

Small & fast

Native Windows apps measured in megabytes, not gigabytes. Start in milliseconds, sip RAM.