Color
#3908fd
#3908fdrgb(57, 8, 253)hsl(252, 98%, 51%)oklch(0.47 0.299 272.1)Colors that go with #3908fd
Royal Blue, Olive Green and Charcoal 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.
Royal Blue #4169e1
shippedRoyal Blue is paired with #3908fd in 4 real palettes, including Dropbox's brand system and MongoDB's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Olive Green #808000
complementaryOlive Green sits directly opposite #3908fd on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #3908fd: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #3908fd in 3 real palettes, including Coinbase's brand system and Behance's brand system — a combination designers have actually shipped, not a computed rotation.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3908fd — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
split-complementSienna is a split-complement of #3908fd: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue Violet #8a2be2
analogousshippedBlue Violet is #3908fd's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #3908fd in two real palettes: Spotify's brand system and Indigo SaaS, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #3908fd
Tints & shades
Harmonies
Contrast
| #3908fd as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.99:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.63:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3908fd as the background.
Brands using this color
Fonts for this mood
#3908fd reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #3908fd and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3908fd-a99cc4-dfb64e-281f2d-e9ecf1?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