#187FAE
Closest named color: Nice Blue (#107AB0). oklch(56.4% 0.113 235), rgb(24, 127, 174).
Aa
Black text reads best on this color (4.68:1).
About this color
#187FAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.113 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.016 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #187FAE |
| RGB | rgb(24, 127, 174) |
| HSL | hsl(199, 76%, 39%) |
| OKLCH | oklch(56.4% 0.113 235) |
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 #187FAE | 4.48:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #187FAE | 4.68:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #187FAE text on white | 4.48:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #187FAE text on black | 4.68:1 | AA | Lc -31.0 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DD
oklch(81% 0.05 234.3)
-
Step 400
400
#6CA9CC
oklch(70.7% 0.081 234.8)
-
Step 500
500
#4093BF
oklch(63.1% 0.104 235)
-
Step 600
600 (this color)
#187FAE
oklch(56.4% 0.113 235)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#095677
oklch(42.8% 0.086 234.2)
-
Step 900
900
#154760
oklch(37.7% 0.067 234.6)
-
Step 950
950
#0E2A38
oklch(27.1% 0.042 233.2)
#187FAE 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) | #687EB0 | 0.068 |
| Deuteranopia (no green cones) | #5471AD | 0.055 |
| Tritanopia (no blue cones) | #008B8F | 0.069 |
| Achromatopsia (no color) | #777777 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187FAE
#187FAE
oklch(56.4% 0.113 235)
- #A7622C
#A7622C
oklch(56.4% 0.112 55.7)
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 #187FAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.016
- Blue NCS #118AB2 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.034
- Cerulean #457B9D ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.036
- Windows Blue #3778BF ΔE 0.041
- Teal Blue #01889F ΔE 0.041
- Cool Blue #4984B8 ΔE 0.041
Use #187FAE 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.