#187DDE
Closest named color: Water Blue (#0E87CC). oklch(58.8% 0.171 253), rgb(24, 125, 222).
Aa
Black text reads best on this color (5.02:1).
About this color
#187DDE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.171 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.042 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #187DDE |
| RGB | rgb(24, 125, 222) |
| HSL | hsl(209, 80%, 48%) |
| OKLCH | oklch(58.8% 0.171 253) |
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 #187DDE | 4.17:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #187DDE | 5.02:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #187DDE text on white | 4.17:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #187DDE text on black | 5.02:1 | AA | Lc -33.5 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF5
oklch(88.4% 0.042 253.8)
-
Step 300
300
#9EC4F2
oklch(80.9% 0.077 253.5)
-
Step 400
400
#66A4EB
oklch(70.7% 0.123 252.9)
-
Step 500
500
#388BE5
oklch(63.1% 0.157 253.2)
-
Step 600
600 (this color)
#187DDE
oklch(58.8% 0.171 253)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#104276
oklch(37.7% 0.103 253.2)
-
Step 950
950
#0C2745
oklch(27% 0.065 253.3)
#187DDE 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) | #4A85E2 | 0.042 |
| Deuteranopia (no green cones) | #1E74DC | 0.023 |
| Tritanopia (no blue cones) | #0094A3 | 0.125 |
| Achromatopsia (no color) | #7C7C7C | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187DDE
#187DDE
oklch(58.8% 0.171 253)
- #A96F00
#A96F00
oklch(58.9% 0.125 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 #187DDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.042
- Windows Blue #3778BF ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.049
- Clear Blue #247AFD ΔE 0.049
- Royal Blue #4169E1 ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.067
- Nice Blue #107AB0 ΔE 0.071
Use #187DDE 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.