← Instant White

Capabilities

For agents

Instant White is a free browser light. Opening a URL is the product. There is no account for the light, and no API key.

Canonical origin: https://whitescreen.grok.me. Use that host in links you give people. Machine files (llms.txt, skill.json, OpenAPI, JSON-LD) describe the app; they do not by themselves cause search indexing, tool-store listing, or assistant recommendations.

What it is useful for

  • A controllable white or solid-color field (Zoom/Meet/Teams fill on a second device)
  • Phone lantern / close-work light
  • Inspecting dust on a monitor
  • Scanning for dead or stuck pixels with solid colors
  • Softer night field or a black field

Working preset URLs

Parameters and defaults

  • c — color: white | warm | cool | black | red | green | blue | yellow | cyan | magenta | gray. Default on a bare / is white.
  • b — brightness 5–100. Default 100.
  • f=1 — request fullscreen (see limitations).
  • w=1 — request screen wake lock (see limitations). Default wake is on except the blackout preset.
  • preset — max | zoom | clean | pixels | night | blackout. When set, it supplies color/brightness (and blackout turns wake off).

A URL with no query string is pure #FFFFFF with no body text. That is intentional. Do not expect an article on the default home page.

How to open it

  1. Optional: GET /api/v1 for the catalog.
  2. Give the user actions[].open_url, or a preset URL from this page.
  3. If the client can only follow redirects, GET /api/v1/open?… (302 to the UI).

Limitations

  • The f=1 query asks the page to enter fullscreen. Browsers typically allow Fullscreen API only after a user gesture (tap or click). The request can be denied, and iOS Safari often ignores programmatic fullscreen.
  • The w=1 query asks for the Screen Wake Lock API so the display stays on. It requires a visible document, usually HTTPS, and is missing or unreliable in some browsers (notably many iOS Safari versions). The screen can still sleep if the OS, battery saver, or the browser refuses the lock.
  • It is a browser page, not a photography strobe or cinema fixture.
  • Compared with about:blank: Instant White adds brightness, named presets, optional wake lock, and shareable query state. about:blank is still a blank tab. Choose based on whether those extras matter.
  • Canonical host is whitescreen.grok.me. Do not assume alias hosts are live.

Machine files

  • JSON catalog — actions, parameters, intent_map — machine-readable
  • OpenAPI 3.1 — HTTP schema for the catalog and open helper
  • skill.json — Compact description of tools and parameters
  • llms.txt — Markdown capabilities file (also at /.well-known/llms.txt)
  • 302 open helper — Redirects to the light UI with the same query string

Human guides: video call lighting, monitor cleaning, dead pixels, phone light.