#187CD7
Closest named color: Water Blue (#0E87CC). oklch(58.1% 0.163 251.9), rgb(24, 124, 215).
Aa
Black text reads best on this color (4.90:1).
About this color
#187CD7 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.163 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.037 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #187CD7 |
| RGB | rgb(24, 124, 215) |
| HSL | hsl(209, 80%, 47%) |
| OKLCH | oklch(58.1% 0.163 251.9) |
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 #187CD7 | 4.28:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #187CD7 | 4.90:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #187CD7 text on white | 4.28:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #187CD7 text on black | 4.90:1 | AA | Lc -32.6 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9EC4EF
oklch(80.8% 0.074 251.8)
-
Step 400
400
#68A5E8
oklch(70.8% 0.117 251.9)
-
Step 500
500
#3A8CE1
oklch(63.1% 0.151 252.1)
-
Step 600
600 (this color)
#187CD7
oklch(58.1% 0.163 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#035091
oklch(42.8% 0.126 251.8)
-
Step 900
900
#114373
oklch(37.8% 0.097 251.5)
-
Step 950
950
#0C2744
oklch(26.9% 0.063 252.6)
#187CD7 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) | #4D83DB | 0.043 |
| Deuteranopia (no green cones) | #2973D5 | 0.023 |
| Tritanopia (no blue cones) | #00929F | 0.120 |
| Achromatopsia (no color) | #7A7A7A | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187CD7
#187CD7
oklch(58.1% 0.163 251.9)
- #A76C00
#A76C00
oklch(58% 0.124 71.9)
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 #187CD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.037
- Windows Blue #3778BF ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.054
- Royal Blue #4169E1 ΔE 0.055
- Clear Blue #247AFD ΔE 0.059
- Nice Blue #107AB0 ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.061
- Cool Blue #4984B8 ΔE 0.065
Use #187CD7 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.