#4187CF
Closest named color: Water Blue (#0E87CC). oklch(61.2% 0.131 251.3), rgb(65, 135, 207).
Aa
Black text reads best on this color (5.59:1).
About this color
#4187CF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.131 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.026 away. Black text reads best on it, at 5.59:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.59:1 |
| White text | 3.75:1 |
Values
| HEX | #4187CF |
| RGB | rgb(65, 135, 207) |
| HSL | hsl(210, 60%, 53%) |
| OKLCH | oklch(61.2% 0.131 251.3) |
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 #4187CF | 3.75:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #4187CF | 5.59:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #4187CF text on white | 3.75:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #4187CF text on black | 5.59:1 | AA | Lc -36.8 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E9
oklch(80.9% 0.064 251.5)
-
Step 400
400
#70A5DE
oklch(70.8% 0.101 251.1)
-
Step 500
500 (this color)
#4187CF
oklch(61.2% 0.131 251.3)
-
Step 600
600
#2576C3
oklch(55.7% 0.142 251.2)
-
Step 700
700
#1662A8
oklch(49% 0.132 251.5)
-
Step 800
800
#165188
oklch(42.8% 0.109 250.9)
-
Step 900
900
#1A436D
oklch(37.6% 0.085 251.6)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#4187CF 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) | #678BD2 | 0.041 |
| Deuteranopia (no green cones) | #537ECE | 0.027 |
| Tritanopia (no blue cones) | #0098A1 | 0.101 |
| Achromatopsia (no color) | #848484 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4187CF
#4187CF
oklch(61.2% 0.131 251.3)
- #B47404
#B47404
oklch(61.2% 0.131 71)
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 #4187CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.026
- Cool Blue #4984B8 ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.041
- Windows Blue #3778BF ΔE 0.047
- Faded Blue #658CBB ΔE 0.051
- Off Blue #5684AE ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.055
Use #4187CF 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.