Download Lightning Assist

14-day free trial — all features included, no credit card required.

Free forever after the trial — text expansion stays unlimited, up to 20 snippets.

Windows operating system logo - Download Lightning Assist for Windows

Windows 10, 11

Digitally signed installer
How to install
  1. Run the downloaded Lightning-Assist-Setup file.
  2. If SmartScreen appears, click “More info” → “Run anyway” — the installer is digitally signed.
  3. The app opens when setup finishes — sign up in the app to start your free trial.
macOS operating system logo - Download Lightning Assist for Mac

macOS 12+

Universal · Intel & Apple Silicon
How to install
  1. Open the .dmg and drag Lightning Assist into Applications.
  2. First launch: right-click the app → Open (needs macOS 12 or newer).
  3. Grant the Accessibility permission when asked — text expansion doesn't work without it.
Linux operating system logo - Download Lightning Assist for Linux

.deb (x64)

Ubuntu, Debian, Mint (Recommended)

Install: sudo apt install ./lightning-assist_*_amd64.deb Step-by-step .deb guide

.tar.gz (x64)

Any Linux distro

Double-click → Extract, then run the AppImage inside — it keeps its run permission.

AppImage (x64)

Portable (advanced)

Run: chmod +x Lightning*.AppImage
Works on Ubuntu 20.04–26.04, Debian 11+, Mint, Pop!_OS, Fedora and other 64-bit distributions. The .deb installs everything automatically; the AppImage runs on any desktop with FUSE support, no libfuse2 needed.
How to install

.deb (x64)

  1. Install it with: sudo apt install ./lightning-assist_*_amd64.deb (or double-click → Software Install). All dependencies come in automatically.
  2. Launch “Lightning Assist” from your applications menu.

.tar.gz (x64)

  1. Extract the downloaded archive (double-click → Extract).
  2. Double-click the extracted "Lightning Assist" AppImage — it runs directly, no chmod needed.

AppImage (x64)

  1. Make it executable: right-click → Properties → allow executing, or run: chmod +x "Lightning Assist*.AppImage".
  2. No libfuse2 needed: the AppImage ships its own runtime. If double-clicking does nothing, run it from a terminal to see the message, or use the .deb.
  3. Still won't open (Ubuntu 24.04+)? Use the .deb instead — it sets up the system sandbox automatically.

One-command install (picks .deb or AppImage for you):

curl -fsSL https://www.lightning-assist.com/install.sh | bash

14-day free trial · no credit card · cancel anytime — Refund on request within 14 days, prorated for time used.

1Download the installer for your OS
2Open it and follow the quick setup
3Type your first snippet in under 2 minutes

New here? See the 2-minute setup guide

Seeing a security prompt on first launch? Here's what to do

Windows: Windows may show a SmartScreen notice on first run. Click "More info" → "Run anyway" — Lightning Assist is a verified, code-signed publisher (Lightning Assist S.R.L.).

macOS: macOS may quarantine the first launch. Right-click the app and choose "Open" once to confirm — the DMG is notarized by Apple.

What you'll see after installing

Your starter snippets: They come with a small symbol in front, like ;hello or ,hello. Which symbol depends on your keyboard layout — we pick one you can actually type without extra keys, so on a Brazilian, French or German keyboard it may be a comma instead of a semicolon. The symbol keeps everyday words from expanding by accident, and you can change it on any snippet.

Two ways to expand: By default your snippets expand as you type. If your language needs an input method (Chinese, Japanese, Korean) we switch you to Hotkey mode instead: there you type the abbreviation in the app you're writing in — your email, browser or chat, never inside Lightning Assist itself — and then press the shortcut. Either way it works in every app; you can switch modes anytime under Activation.

By downloading Lightning Assist you agree to our Terms of Service, Privacy Policy and EULA.

Before you download

Lightning Assist is an AI-powered text expander for Windows, macOS, and Linux. Download the desktop app to turn shortcuts into full messages, run AI commands on selected text, and dictate with push-to-talk voice typing in any application.

  • Native desktop app — works in email, browsers, Slack, Teams, IDEs, terminals, and more.
  • 14-day free trial with every feature; unlimited text expansion stays free afterwards, with up to 20 snippets.
  • GDPR-minded design; your snippet content stays private to your account.

Learn more: Documentation hub · Pricing & plan · Community snippet library