#187CBB
Closest named color: Nice Blue (#107AB0). oklch(56.4% 0.129 243.4), rgb(24, 124, 187).
Aa
Black text reads best on this color (4.63:1).
About this color
#187CBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.129 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.018 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.63:1 |
| White text | 4.52:1 |
Values
| HEX | #187CBB |
| RGB | rgb(24, 124, 187) |
| HSL | hsl(203, 77%, 41%) |
| OKLCH | oklch(56.4% 0.129 243.4) |
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 #187CBB | 4.52:1 | AA | Lc -76.4 | Fine for body text |
| Black text on #187CBB | 4.63:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #187CBB text on white | 4.52:1 | AA | Lc 70.9 | Content text, not long reading |
| #187CBB text on black | 4.63:1 | AA | Lc -30.7 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A1C6E4
oklch(81% 0.058 243)
-
Step 400
400
#6CA7D6
oklch(70.6% 0.093 243.7)
-
Step 500
500
#3F90CC
oklch(63% 0.12 243.9)
-
Step 600
600 (this color)
#187CBB
oklch(56.4% 0.129 243.4)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#0A5381
oklch(42.6% 0.1 244)
-
Step 900
900
#154567
oklch(37.6% 0.077 243.7)
-
Step 950
950
#0E293C
oklch(27% 0.048 242.2)
#187CBB 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) | #5E7EBE | 0.057 |
| Deuteranopia (no green cones) | #4770BA | 0.042 |
| Tritanopia (no blue cones) | #008C93 | 0.089 |
| Achromatopsia (no color) | #767676 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187CBB
#187CBB
oklch(56.4% 0.129 243.4)
- #A96200
#A96200
oklch(56.4% 0.128 63.4)
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 #187CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.018
- Windows Blue #3778BF ΔE 0.021
- Water Blue #0E87CC ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Cool Blue #4984B8 ΔE 0.043
- Blue NCS #118AB2 ΔE 0.046
- Muted Blue #3B719F ΔE 0.049
Use #187CBB 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.