#4187BE
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.11 244.8), rgb(65, 135, 190).
Aa
Black text reads best on this color (5.43:1).
About this color
#4187BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.110 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.012 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #4187BE |
| RGB | rgb(65, 135, 190) |
| HSL | hsl(206, 49%, 50%) |
| OKLCH | oklch(60.3% 0.11 244.8) |
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 #4187BE | 3.86:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #4187BE | 5.43:1 | AA | Lc 38.2 | Non-text elements, placeholder text |
| #4187BE text on white | 3.86:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #4187BE text on black | 5.43:1 | AA | Lc -35.8 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A4C5E2
oklch(80.9% 0.054 245.1)
-
Step 400
400
#72A7D3
oklch(70.8% 0.086 244.5)
-
Step 500
500 (this color)
#4187BE
oklch(60.3% 0.11 244.8)
-
Step 600
600
#2879B4
oklch(55.6% 0.119 244.8)
-
Step 700
700
#19669B
oklch(49.2% 0.111 244.5)
-
Step 800
800
#19537E
oklch(42.7% 0.092 245.2)
-
Step 900
900
#1C4565
oklch(37.7% 0.072 245)
-
Step 950
950
#11293B
oklch(27.1% 0.045 243.2)
#4187BE 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) | #6F88C0 | 0.049 |
| Deuteranopia (no green cones) | #5D7CBD | 0.038 |
| Tritanopia (no blue cones) | #00949A | 0.082 |
| Achromatopsia (no color) | #828282 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4187BE
#4187BE
oklch(60.3% 0.11 244.8)
- #AE7231
#AE7231
oklch(60.3% 0.11 64.9)
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 #4187BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.012
- Steel Blue #4682B4 ΔE 0.018
- Off Blue #5684AE ΔE 0.029
- Water Blue #0E87CC ΔE 0.031
- Dusty Blue #5A86AD ΔE 0.033
- Blue NCS #118AB2 ΔE 0.034
- Faded Blue #658CBB ΔE 0.041
- Windows Blue #3778BF ΔE 0.045
Use #4187BE 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.