Playground
Open in tool →Orange, blue and green — the colors of playground equipment; loud, cheerful, obviously for kids.
Color
#3685fc
#3685fc
hex
#3685fcrgb
rgb(54, 133, 252)hsl
hsl(216, 97%, 60%)oklch
oklch(0.632 0.194 258.8)Closest name: Azure (#007fff)Relative luminance 0.2459
Colors that go with #3685fc
Charcoal, Red 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 #3685fc: softer than #000 and cool enough to feel like part of the same palette.
Red #ff0000
triadicshippedRed completes a triad with #3685fc — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #3685fc in 9 real palettes, including Google's brand system and Heatwave, as the accent.
Blue #0000ff
shipped12 real palettes, including Readymag's brand system and Unity's brand system put Blue beside #3685fc, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3685fc: 10 real palettes, including Carrefour's brand system and Behance's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3685fc in 9 real palettes, including Behance's brand system and WWE's brand system, as the accent.
Dark Orange #ff8c00
shippedDark Orange shows up next to #3685fc 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 #3685fc: 10 real palettes, including Venmo's brand system and Patreon's brand system, as the supporting colour.
Real palettes that use #3685fc
Tints & shades
Harmonies
Contrast
| #3685fc as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.55:1 | fail | pass | fail | |
Aaon black | 5.92:1 | 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 #3685fc as the background.
Brands using this color
- Courserasecondary · #3286ff · Δ0.504
- HashiCorpsecondary · #2b89ff · Δ1.092
- Splineprimary · #4482fc · Δ1.133
- Googleprimary · #4285f4 · Δ1.414
- PostHogsecondary · #2f80fa · Δ1.447
- Replitaccent · #0f87ff · Δ1.581
- Bluesky Socialprimary · #1484fc · Δ1.608
- Bluesky Socialsecondary · #0085ff · Δ1.895
- Openseaprimary · #0484fc · Δ1.912
Palettes built around it
Fonts for this mood
#3685fc reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3685fc
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 #3685fc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3685fc-9ca7c4-df5f4e-201f2d-e9f0f1?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