Cobalt Pop
Open in tool →One deep cobalt and one hot pink on white — a two-accent system for launches and campaign pages that need punch.
Color
#f3728a
#f3728a
hex
#f3728argb
rgb(243, 114, 138)hsl
hsl(349, 84%, 70%)oklch
oklch(0.711 0.159 10.4)Closest name: Embarrassed (#ee7799)Relative luminance 0.3292
Colors that go with #f3728a
Charcoal, Light Sea Green and Amber 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 body-text near-black for #f3728a: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Light Sea Green #20b2aa
complementaryshippedLight Sea Green sits directly opposite #f3728a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #f3728a in 4 real palettes, including Beach Hut and Ember, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #f3728a in 4 real palettes, including Target : Expect More. Pay Less.'s brand system and Casper Sleep's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #f3728a: 7 real palettes, including Target : Expect More. Pay Less.'s brand system and Postman's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #f3728a: 7 real palettes, including Spline's brand system and Figma's brand system, as the lead colour.
Midnight Blue #191970
shipped5 real palettes, including Lavender Haze and Monzo's brand system put Midnight Blue beside #f3728a, as the text colour against it.
Mustard Yellow #ffdb58
shipped5 real palettes, including Lido and Crayon Box put Mustard Yellow beside #f3728a, as the accent.
Real palettes that use #f3728a
Tints & shades
Harmonies
Contrast
| #f3728a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.77:1 | fail | fail | fail | |
Aaon black | 7.58:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #f3728a as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#f3728a reads as warm, vivid, light. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #f3728a
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 #f3728a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/f3728a-c49c9f-62cb85-2d231f-f1e9ee?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