Turn any screen into a controllable light. Works as a Chrome extension or as a simple website.

From the top toolbar, adjust:

• Color – choose any hue using the color picker.
• Brightness – fine‑tune intensity for your room.
• Color temperature – set Kelvin (e.g., 2700K warm, 6500K cool) for photography or comfort.

Tip: Temperature and color stay in sync, so changing one updates the other automatically.

Use Warm, Cool, and White to jump to tried‑and‑true lighting setups. Presets instantly update the color picker and temperature readout.

Soften your scene or add gentle motion:

• Static – a steady wash of color.
• Fade – gradual transitions in intensity for a relaxed glow.
• Pulse – subtle rhythmic brightening and dimming.

Animations are designed to be low‑distraction and performant. See eye‑safety for flashing guidance.

• Enter / exit fullscreen with F.
• Hide / show the toolbar with H.
• Move your pointer to the very top edge to reveal the toolbar; it auto‑hides after a few seconds.

Some browsers require a click before allowing fullscreen. If blocked, click anywhere on the page, then press F again.

Hover your cursor at the top edge to temporarily reveal the toolbar while the UI is hidden. The toolbar hides automatically after ~6 seconds of inactivity.

Add quick cues on top of the light panel:

• Mode: switch between Off, Type (rich‑text sticky notes), and Draw (freehand).
• Manipulate: drag notes to reposition; resize or edit their text.
• Clear: remove all annotations with one click.

Persistence: Notes and drawings are saved automatically and restored when you reopen ScreenLight.

• Both builds share a unified storage layer.
• Extension: preferences sync across signed‑in Chrome browsers using chrome.storage.sync.
• Web app: settings persist locally per browser/device via localStorage.
• On load, ScreenLight restores your color, brightness, ambient mode, annotations, and UI visibility.

Adjust the Kelvin slider to match a target color temperature. ScreenLight converts Kelvin to RGB and updates the color picker. Selecting a new color also adjusts the Kelvin readout to the nearest match.

• Click the toolbar icon to open ScreenLight in a dedicated tab.
• Preferences sync automatically across your signed‑in Chrome profiles.
• Changes propagate in real time between open windows via storage change listeners.

You may need to pin the extension to make the icon visible in the toolbar.

• Open the hosted URL anywhere (or load the public/ bundle locally).
• All features are available; settings persist per browser/device.
• No login required; no data leaves your device (except optional donation link).

• Avoid high‑brightness flashing if you’re sensitive to light or prone to migraines/photosensitive epilepsy.
• Prefer Static or gentle Fade in dark environments.
• Take regular breaks; look away from the screen every 20 minutes.

ScreenLight stores preferences and annotations locally (or via Chrome Sync for the extension). No usage analytics are sent. The Buy me a coffee button opens a PayPal page; no payment data is handled by ScreenLight.

• Initial tutorial release covering: controls, presets, ambient modes, fullscreen/UI, shortcuts, auto‑hide, annotations (with persistence), Kelvin↔︎RGB sync, extension vs web storage behavior.

For code‑level changes, see your repository commit history.