#3659CC
Closest named color: Warm Blue (#4B57DB). oklch(50.7% 0.183 266.8), rgb(54, 89, 204).
Aa
White text reads best on this color (6.07:1).
About this color
#3659CC is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.183 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.034 away. White text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #3659CC |
| RGB | rgb(54, 89, 204) |
| HSL | hsl(226, 60%, 51%) |
| OKLCH | oklch(50.7% 0.183 266.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3659CC | 6.07:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #3659CC | 3.45:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #3659CC text on white | 6.07:1 | AA | Lc 79.8 | Fine for body text |
| #3659CC text on black | 3.45:1 | AA large text | Lc -22.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A7C0FB
oklch(81% 0.088 266.6)
-
Step 400
400
#789CF9
oklch(70.7% 0.142 266.8)
-
Step 500
500
#5880F5
oklch(63% 0.18 267)
-
Step 600
600
#3F66E4
oklch(55.5% 0.196 266.8)
-
Step 700
700 (this color)
#3659CC
oklch(50.7% 0.183 266.8)
-
Step 800
800
#2945A0
oklch(42.6% 0.151 266.8)
-
Step 900
900
#253C7F
oklch(37.8% 0.117 266.5)
-
Step 950
950
#16234B
oklch(26.9% 0.076 267.6)
#3659CC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0069D0 | 0.043 |
| Deuteranopia (no green cones) | #005CCA | 0.029 |
| Tritanopia (no blue cones) | #00758A | 0.144 |
| Achromatopsia (no color) | #626262 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3659CC
#3659CC
oklch(50.7% 0.183 266.8)
- #7F6000
#7F6000
oklch(50.7% 0.104 86.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3659CC, closest first.
No curated palette has a color within ΔE 0.04 of #3659CC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.034
- Azul #1D5DEC ΔE 0.052
- Royal Blue #4169E1 ΔE 0.053
- Iris #6258C4 ΔE 0.057
- Neon Blue #4361EE ΔE 0.058
- Blue Blue #2242C7 ΔE 0.061
- Mid Blue #276AB3 ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.066
Use #3659CC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.