Getting started with Lekhini

Lekhini is an on-screen annotation overlay — a transparent, always-on-top window you can draw on, on top of any app. This guide gets you from download to your first annotation in a couple of minutes.

1. Install

Pick the download for your operating system from the Lekhini product page:

• Windows — run Lekhini-Setup-1.1.0.exe and follow the installer.
• macOS — open the .dmg and drag Lekhini into Applications. Choose the Apple Silicon build for M1/M2/M3 Macs, or the Intel build otherwise.

On macOS, the first launch may require right-click → Open to bypass Gatekeeper on unsigned community builds.

Installed builds auto-update from GitHub Releases, so you’ll be prompted as new versions ship.

2. Grant permissions (macOS)

On first launch, macOS prompts for two permissions. Both are optional:

• Screen Recording — used only when you save an annotated screenshot. Denying it just disables screenshot export.
• Accessibility — lets global hotkeys work while another app is focused. Denying it disables global hotkeys when Lekhini isn’t in front.

To grant them later: System Settings → Privacy & Security → Screen Recording / Accessibility, then quit and relaunch Lekhini.

3. Toggle draw mode and start annotating

The overlay is click-through by default — clicks pass through to the app underneath. Press ⌘⇧D (or click the status dot on the toolbar) to toggle draw mode. The status dot turns green when you’re drawing, red when idle.

Now pick a tool from the floating toolbar and draw anywhere on screen:

• Pencil — graphite-textured, uniform width.
• Pen — smooth ink that thins with speed/pressure.
• Highlighter — translucent marker.
• Eraser, Hand (move/edit), and shapes (line, trendline, Fibonacci, rectangle, ellipse, arrow, text).

4. Save a screenshot

Press ⌘⇧S to capture the screen with your annotations baked into a saved PNG.

5. Ask AI about a snip (optional)

Lekhini’s AI is opt-in and local-first. Enable it in Settings → AI — turn on Local AI (a first-run wizard installs Ollama and the recommended models) or pick a cloud provider and paste your own API key.

Once set up, snip a region of your screen and click Ask AI. A chat panel opens and solves what’s in the image — math, code, a question, an error — and you can keep asking follow-ups in the same conversation. Lekhini also transcribes handwriting on-device, autocorrects typed and recognized text, and (in the Trader profile) reads your drawn chart levels. With Local AI on, none of this leaves your machine.

Default hotkeys

Profiles

Switch profiles from Settings → Profile; your choice is remembered.

• General — pencil, pen, eraser, hand, line, arrow, text, rectangle, ellipse, snip.
• Teacher — adds the highlighter for presentations.
• Trader — chart tools: trendline (Shift-snap), Fibonacci retracement and region selector.

A note on macOS fullscreen

No overlay tool can float above an app in native fullscreen (its own Space). Use maximized, non-fullscreen windows instead, or disable “Displays have separate Spaces” in System Settings → Desktop & Dock.

Next steps

Found a bug or want a feature? Open an issue on GitHub — Lekhini is community-owned and contributions are welcome.