Heatwave
Open in tool →Blaze orange and hot yellow with one cold blue — the high-noon palette; use the blue where the eye needs to rest.
Color
#128df3
#128df3
hex
#128df3rgb
rgb(18, 141, 243)hsl
hsl(207, 90%, 51%)oklch
oklch(0.636 0.18 251.2)Closest name: dodgerblue (#1e90ff)Relative luminance 0.2565
Colors that go with #128df3
Charcoal, Amber and Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #128df3: softer than #000 and cool enough to feel like part of the same palette.
Amber #ffbf00
shippedAmber is paired with #128df3 in 12 real palettes, including Heatwave and Google's brand system, as the supporting colour.
Blue #0000ff
shipped11 real palettes, including Unity's brand system and Readymag's brand system put Blue beside #128df3, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #128df3: 10 real palettes, including Carrefour's brand system and Blue Mono, as the accent.
Crimson #dc143c
shippedCrimson is paired with #128df3 in 8 real palettes, including NASCAR's brand system and Behance's brand system, as the supporting colour.
Dark Orange #ff8c00
shippedDark Orange shows up next to #128df3 in 4 real palettes, including Playground and Elastic's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #128df3: 10 real palettes, including Venmo's brand system and Patreon's brand system, as the supporting colour.
Dark Goldenrod #b8860b
complementaryDark Goldenrod sits directly opposite #128df3 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #128df3
Tints & shades
Harmonies
Contrast
| #128df3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.43:1 | fail | pass | fail | |
Aaon black | 6.13:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #128df3 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#128df3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #128df3
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #128df3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/128df3-9cadc4-df4e53-1f212d-e9f1f1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md