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 10, 11
How to install
- Run the downloaded Lightning-Assist-Setup file.
- If SmartScreen appears, click “More info” → “Run anyway” — the installer is digitally signed.
- The app opens when setup finishes — sign up in the app to start your free trial.

macOS 12+
How to install
- Open the .dmg and drag Lightning Assist into Applications.
- First launch: right-click the app → Open (needs macOS 12 or newer).
- Grant the Accessibility permission when asked — text expansion doesn't work without it.

.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*.AppImageHow to install
.deb (x64)
- Install it with: sudo apt install ./lightning-assist_*_amd64.deb (or double-click → Software Install). All dependencies come in automatically.
- Launch “Lightning Assist” from your applications menu.
.tar.gz (x64)
- Extract the downloaded archive (double-click → Extract).
- Double-click the extracted "Lightning Assist" AppImage — it runs directly, no chmod needed.
AppImage (x64)
- Make it executable: right-click → Properties → allow executing, or run: chmod +x "Lightning Assist*.AppImage".
- 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.
- 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 | bash14-day free trial · no credit card · cancel anytime — Refund on request within 14 days, prorated for time used.
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