Color
#309dc5
#309dc5rgb(48, 157, 197)hsl(196, 61%, 48%)oklch(0.653 0.112 227.4)Colors that go with #309dc5
Charcoal, Tomato 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 text near-black for #309dc5: softer than #000 and cool enough to feel like part of the same palette.
Tomato #ff6347
split-complementshippedTomato is a split-complement of #309dc5: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #309dc5 in 7 real palettes, including Beach Hut and Salesforce's brand system, as the supporting colour.
Blue #0000ff
shipped5 real palettes, including Qualcomm's brand system and Unity's brand system put Blue beside #309dc5, as the accent.
Crimson #dc143c
shippedCrimson is paired with #309dc5 in 6 real palettes, including Diner and Retro Pop, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #309dc5: 6 real palettes, including Telegram's brand system and Snowflake AI Data Cloud's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #309dc5: 12 real palettes, including Gopro's brand system and Coca-Cola's brand system, as the lead colour.
Dodger Blue #1e90ff
analogousshippedDodger Blue is #309dc5's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Real palettes that use #309dc5
Tints & shades
Harmonies
Contrast
| #309dc5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.11:1 | fail | pass | fail | |
Aaon black | 6.75:1 | 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 #309dc5 as the background.
Brands using this color
Fonts for this mood
#309dc5 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 #309dc5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/309dc5-9cb5c4-df4e6e-1f232d-e9f1ef?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