#187ABE
Closest named color: Windows Blue (#3778BF). oklch(56.1% 0.135 245.7), rgb(24, 122, 190).
Aa
White text reads best on this color (4.59:1).
About this color
#187ABE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.135 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.56:1 |
| White text | 4.59:1 |
Values
| HEX | #187ABE |
| RGB | rgb(24, 122, 190) |
| HSL | hsl(205, 78%, 42%) |
| OKLCH | oklch(56.1% 0.135 245.7) |
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 #187ABE | 4.59:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #187ABE | 4.56:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #187ABE text on white | 4.59:1 | AA | Lc 71.4 | Content text, not long reading |
| #187ABE text on black | 4.56:1 | AA | Lc -30.2 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E6
oklch(80.8% 0.061 246.3)
-
Step 400
400
#6CA7D9
oklch(70.8% 0.096 245.3)
-
Step 500
500
#4090CF
oklch(63.2% 0.123 245.4)
-
Step 600
600 (this color)
#187ABE
oklch(56.1% 0.135 245.7)
-
Step 700
700
#0165A2
oklch(49.1% 0.125 245.6)
-
Step 800
800
#0B5384
oklch(42.8% 0.104 245.7)
-
Step 900
900
#154569
oklch(37.7% 0.08 245.2)
-
Step 950
950
#0E283E
oklch(26.9% 0.052 246.9)
#187ABE 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) | #597DC1 | 0.053 |
| Deuteranopia (no green cones) | #416FBD | 0.036 |
| Tritanopia (no blue cones) | #008B93 | 0.095 |
| Achromatopsia (no color) | #757575 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187ABE
#187ABE
oklch(56.1% 0.135 245.7)
- #A56300
#A56300
oklch(56.1% 0.125 66)
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 #187ABE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Nice Blue #107AB0 ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.038
- Water Blue #0E87CC ΔE 0.039
- Steel Blue #4682B4 ΔE 0.044
- Mid Blue #276AB3 ΔE 0.045
- French Blue #436BAD ΔE 0.048
- Cool Blue #4984B8 ΔE 0.049
Use #187ABE 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.