#187CEF
Closest named color: Clear Blue (#247AFD). oklch(59.7% 0.193 256.2), rgb(24, 124, 239).
Aa
Black text reads best on this color (5.16:1).
About this color
#187CEF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.193 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.023 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #187CEF |
| RGB | rgb(24, 124, 239) |
| HSL | hsl(212, 87%, 52%) |
| OKLCH | oklch(59.7% 0.193 256.2) |
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 #187CEF | 4.06:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #187CEF | 5.16:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #187CEF text on white | 4.06:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #187CEF text on black | 5.16:1 | AA | Lc -34.5 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#99C3FD
oklch(80.8% 0.094 256.6)
-
Step 400
400
#5DA2FD
oklch(70.8% 0.151 256)
-
Step 500
500 (this color)
#187CEF
oklch(59.7% 0.193 256.2)
-
Step 600
600
#006FDF
oklch(55.6% 0.191 256.1)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#033F82
oklch(37.6% 0.126 256.1)
-
Step 950
950
#07264C
oklch(27.1% 0.079 255.8)
#187CEF 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) | #3688F3 | 0.038 |
| Deuteranopia (no green cones) | #0075ED | 0.020 |
| Tritanopia (no blue cones) | #0098AA | 0.145 |
| Achromatopsia (no color) | #7E7E7E | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187CEF
#187CEF
oklch(59.7% 0.193 256.2)
- #A97300
#A97300
oklch(59.6% 0.125 76.2)
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 #187CEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.023
- Cerulean Blue #056EEE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.056
- Bright Blue #0165FC ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.062
- Neon Blue #4361EE ΔE 0.065
- Water Blue #0E87CC ΔE 0.065
Use #187CEF 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.