Brand and data resources

Brand

The mark is an "O" built from five data rows: open data, row by row. It is always one colour. On the site a neon pink light passes across it every few seconds; that is a motion effect, not a colour variant, and the resting mark stays black.

Black

Primary. Use on white and light backgrounds.

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White

Reverse. Use on black, dark and photographic backgrounds.

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Tile, dark

App icon and favicon form.

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Tile, light

App icon form for dark surfaces.

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Neon tiles

White mark on a neon field, for social avatars, stickers and accents. Use one colour per surface.

Blue #2563eb

The action colour: it sweeps the mark and every primary button on the site.

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Neon pink #ff2d95

Secondary accent.

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Neon cyan #00e5ff

Cool accent.

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Neon yellow #ccff00

Highlight.

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Wordmark

Black on white

PNGSVG (needs Inter installed)

White on black

PNGSVG (needs Inter installed)

Download everything (zip) · The wordmark is set in Inter Semibold; the SVG references the font by name, the PNGs are the portable form.

Colour

The interface is monochrome: ink and paper, with a neutral grey scale between them. Neon colours are accents, never the colour of the mark itself except on a neon tile, where the mark is white. The one deliberate colour exception in the product is the green/amber/red banding on estimated margin.

Type

Inter for interface and copy (headings semibold, tight tracking). JetBrains Mono for data cells, identifiers and code, with tabular figures. Both are open licences.

Usage

• Keep clear space around the mark equal to the height of one row; never place it smaller than 16 px.
• Do not rotate, skew, outline, add gradients or shadows, or change the row proportions.
• One colour per surface: black or white mark on neutral backgrounds; white mark on a neon field.
• "OpenStream" is one word with a capital O and S. Do not translate or abbreviate.
• You may use the mark to indicate that data comes from OpenStream. Do not imply endorsement of a product or offer.

Design system

The site is built on Radix Themes with a single master action token (blue #2563eb) that drives every button, the mark and the savings chips, beside a pastel palette of sun, sky and cloud. Tokens, type scale, spacing and every component are documented with live examples on the design system page.

Data resources

• API & MCP documentation, including connect commands for Claude Code, Codex and ChatGPT.
• OpenAPI 3.1, importable as actions into a custom GPT.
• MCP endpoint, Streamable HTTP, no key for the public tier.
• llms.txt, the agent-readable site summary and start-here links.
• Answers index (JSON) and the answer pages.
• Methodology and the nightly index status.