#187DA8
Closest named color: Nice Blue (#107AB0). oklch(55.6% 0.108 233.1), rgb(24, 125, 168).
Aa
White text reads best on this color (4.62:1).
About this color
#187DA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.108 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.017 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.53:1 |
| White text | 4.62:1 |
Values
| HEX | #187DA8 |
| RGB | rgb(24, 125, 168) |
| HSL | hsl(198, 75%, 38%) |
| OKLCH | oklch(55.6% 0.108 233.1) |
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 #187DA8 | 4.62:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #187DA8 | 4.53:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #187DA8 text on white | 4.62:1 | AA | Lc 71.7 | Content text, not long reading |
| #187DA8 text on black | 4.53:1 | AA | Lc -30.0 | Dividers and decoration only |
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
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6EA9C9
oklch(70.6% 0.077 233.1)
-
Step 500
500
#4293BC
oklch(63% 0.1 233.5)
-
Step 600
600 (this color)
#187DA8
oklch(55.6% 0.108 233.1)
-
Step 700
700
#036990
oklch(49% 0.101 233.2)
-
Step 800
800
#0D5675
oklch(42.7% 0.083 233.1)
-
Step 900
900
#16475E
oklch(37.7% 0.065 232.7)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#187DA8 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) | #687CAA | 0.069 |
| Deuteranopia (no green cones) | #556FA7 | 0.057 |
| Tritanopia (no blue cones) | #00888C | 0.063 |
| Achromatopsia (no color) | #757575 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187DA8
#187DA8
oklch(55.6% 0.108 233.1)
- #A46031
#A46031
oklch(55.7% 0.108 53.1)
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 #187DA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.017
- Cerulean #457B9D ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.033
- Ocean #017B92 ΔE 0.036
- Muted Blue #3B719F ΔE 0.037
- Sea Blue #047495 ΔE 0.038
- Blue NCS #118AB2 ΔE 0.038
- Dull Blue #49759C ΔE 0.038
Use #187DA8 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.