pebrel/extra/logo

Logo Assets

Nebula App Icon

The rounded, asymmetric symbol and cutout prompt are shared by 25 colorways. Titanium (palette 21) is the default application and README identity. The display name is Pebrel; asset paths retain Nebula for compatibility. The original 01–24 palettes are available as personal choices, with graphite violet retained as palette 25.

Setting	Source	Role
titanium	nebula-titanium.svg	Default identity; palette 21
silver-violet	nebula-light.svg	Optional silver-violet colorway; palette 12
graphite-violet	nebula-dark.svg	Optional graphite / gray-violet colorway; palette 25

nebula_settings/src/app_icon.rs is the canonical catalog of stable setting keys, original palette numbers, bilingual names and colors. The renderer exports icon-catalog.json from it. Personal color options do not imply exclusive colors or completed trademark clearance.

Switching

GPUI Settings → Appearance → App icon writes app_icon= to nebula_settings.txt. Missing or invalid values fall back to Titanium. Existing valid selections remain unchanged. The picker initially shows the three colorways above and the current selection, with a button to show all 25. Appearance reset restores the default; appearance backup includes the selection. Icon selection is independent of terminal/system theme selection.

On Windows, selection updates open window icons (including Alt+Tab), the tray, and in-app previews. New windows and subsequent notifications use the selection too. Window icons use per-window DPI and are reapplied when the window's scale changes. Existing pinned shortcuts, Explorer's EXE icon and the installer keep the default brand icon; no shortcut, executable or system icon cache is rewritten. Linux/macOS currently change only the in-app preview; their Dock/launcher icon remains the packaged default.

Clarity and resource budget

The default ICO contains 32-bit RGBA PNG frames at 16, 20, 24, 28, 32, 40, 48, 56, 64, 80, 96, 112, 128 and 256 physical pixels. The shared coverage atlas contains these sizes plus a 512px frame. Below 64px, the mark gradually increases from 90 to 108 SVG units, with a pixel-fitted prompt and a minimum 1.5px cutout stroke. The underline is aligned to the physical pixel grid. The tile and outer symbol paths stay unchanged; 64px and larger preserve the original master geometry.

The generator renders at 8× resolution for 16–64px and 4× above that, then averages premultiplied coverage before applying colors. This avoids colored transparent fringes and sharpening halos. Nonstandard sizes resample coverage with a non-ringing triangle filter before colorization. In-app previews request their actual logical size times the window scale factor; the tray receives exact-size RGBA pixels without a second resize. Antialiasing still produces partially covered edge pixels, and shell/browser scaling can affect appearance.

Windows embeds one default icon group and one shared coverage atlas, not 25 complete ICOs or PNG collections. Palette colors are applied at runtime using the existing image dependency. Non-Windows in-app previews use the same atlas. The combined Windows image payload is 80,402 bytes (78.52 KiB), below the 96 KiB budget enforced by the generator and tests. This measures image data, not installer growth. PNG/preview caches have a 128-entry limit; native window icon handles are reused, and owned tray handles are destroyed when replaced.

nebula.ico is byte-identical to nebula-titanium.ico, and nebula.png to nebula-titanium.png. Alternate ICOs and 1024px PNG exports are design assets, not extra GPUI runtime embeds.

Regenerate using Node.js 24+ with @resvg/resvg-js (verified with 2.6.2):

node scripts/render-app-icons.mjs /path/to/renderer/package.json
node scripts/render-app-icons.mjs /path/to/renderer/package.json --check
python3 -m unittest scripts.tests.test_app_icons -v
cargo test -p nebula-settings --offline --locked
cargo test -p nebula --bin nebula --features gpui-shell app_icon::tests

The renderer is development-only; it adds no application dependency. The optional argument locates a separate renderer installation. The default nebula.ico and nebula.png exports always remain Titanium.

Design archive

The local 24-color exploration remains in docs/design/icon-color-lab-2026-09-05/index.html. The updated local preview at docs/design/icon-all-palettes-2026-09-05/index.html shows all 25 choices on light/dark surfaces and a before/after small-size comparison. These are PNG contact sheets, not native taskbar screenshots. Original sage SVG masters remain in docs/design/icon-final-2026-09-05/archive/. The historical pages do not define the current default. These local design archives are ignored by Git and are not required by the asset tests.

Third-Party Logo Assets

Grok

ai_grok_dark.png and ai_grok_light.png are unmodified copies of Grok_Logomark_Dark.png and Grok_Logomark_Light.png from the official xAI asset archive:

• Brand guidelines: https://x.ai/legal/brand-guidelines
• Asset archive: https://data.x.ai/logos/xAI_Grok_Assets.zip
• Archive SHA-256: F41A93923A85047B4B5A9571B7EC73339F562C3E58ACD096E25584AB0AE2A1FB
• Dark PNG SHA-256: 37DDBCB6E2A7F2E4B3BE78A7D41296A3BC7EDF6926362434EFC00DF5A56A3586
• Light PNG SHA-256: 359056EE8983CFA0BA7E72795078C7C0DDF6C5D7A1870401AB960ED4F9DF9E53

xAI owns the trademark, intellectual property, and branding rights in xAI, Grok, and their logos. The xAI Brand Guidelines are usage terms, not an open-source asset license. These files are used only to identify a running grok or grok-cli process and do not imply xAI endorsement, approval, or sponsorship. The application selects the supplied dark or light file for contrast and scales it only when rendering; the committed files are unchanged.

Google Antigravity

ai_antigravity.png is an unmodified copy of the full-color product icon from Google's Antigravity press assets, verified on 2026-09-06:

• Press assets: https://antigravity.google/press/
• PNG: https://antigravity.google/assets/image/brand/antigravity-icon__full-color.png
• Dimensions: 540 x 540, with transparency
• SHA-256: E0CD08CCD10CD8D08CCF0BA449823EE88495825C0841619618100D3AB089F51E

Google retains rights to its product names and logos. Publication in a press kit does not make the logo an open-source asset or imply endorsement. The icon is used to identify running antigravity, antigravity-cli and agy processes. Both UI shells keep its original colors on light and dark themes and resize it only for rendering. No LobeHub asset is embedded for Antigravity.