#187FE4
Closest named color: Clear Blue (#247AFD). oklch(59.6% 0.176 253.5), rgb(24, 127, 228).
Aa
Black text reads best on this color (5.19:1).
About this color
#187FE4 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.176 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.041 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #187FE4 |
| RGB | rgb(24, 127, 228) |
| HSL | hsl(210, 81%, 49%) |
| OKLCH | oklch(59.6% 0.176 253.5) |
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 #187FE4 | 4.04:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #187FE4 | 5.19:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #187FE4 text on white | 4.04:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #187FE4 text on black | 5.19:1 | AA | Lc -34.6 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DCF9
oklch(88.6% 0.048 253.2)
-
Step 300
300
#9AC4F8
oklch(80.9% 0.087 254.1)
-
Step 400
400
#5FA4F4
oklch(70.8% 0.137 253.4)
-
Step 500
500 (this color)
#187FE4
oklch(59.6% 0.176 253.5)
-
Step 600
600
#0072D5
oklch(55.5% 0.175 253.6)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#03417C
oklch(37.6% 0.115 253.5)
-
Step 950
950
#072749
oklch(27.1% 0.073 253.3)
#187FE4 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) | #4988E8 | 0.042 |
| Deuteranopia (no green cones) | #1876E2 | 0.024 |
| Tritanopia (no blue cones) | #0097A6 | 0.130 |
| Achromatopsia (no color) | #7E7E7E | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187FE4
#187FE4
oklch(59.6% 0.176 253.5)
- #AC7100
#AC7100
oklch(59.6% 0.127 73.1)
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 #187FE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.041
- Water Blue #0E87CC ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.056
- Windows Blue #3778BF ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.057
- Soft Blue #6488EA ΔE 0.067
Use #187FE4 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.