#187FD9
Closest named color: Water Blue (#0E87CC). oklch(58.9% 0.163 251.2), rgb(24, 127, 217).
Aa
Black text reads best on this color (5.07:1).
About this color
#187FD9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.163 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.033 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #187FD9 |
| RGB | rgb(24, 127, 217) |
| HSL | hsl(208, 80%, 47%) |
| OKLCH | oklch(58.9% 0.163 251.2) |
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 #187FD9 | 4.13:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #187FD9 | 5.07:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #187FD9 text on white | 4.13:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #187FD9 text on black | 5.07:1 | AA | Lc -33.8 | 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
#9EC5EF
oklch(81% 0.073 250.6)
-
Step 400
400
#67A5E7
oklch(70.7% 0.117 251.2)
-
Step 500
500
#388DE0
oklch(63.2% 0.149 251)
-
Step 600
600 (this color)
#187FD9
oklch(58.9% 0.163 251.2)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#104373
oklch(37.7% 0.097 251.2)
-
Step 950
950
#0C2843
oklch(27.1% 0.061 250.4)
#187FD9 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) | #5186DD | 0.046 |
| Deuteranopia (no green cones) | #2E75D7 | 0.026 |
| Tritanopia (no blue cones) | #0095A1 | 0.120 |
| Achromatopsia (no color) | #7D7D7D | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #187FD9
#187FD9
oklch(58.9% 0.163 251.2)
- #AB6E00
#AB6E00
oklch(58.9% 0.127 71.3)
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 #187FD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.033
- Windows Blue #3778BF ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.054
- Clear Blue #247AFD ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.058
- Royal Blue #4169E1 ΔE 0.061
- Cool Blue #4984B8 ΔE 0.062
- Nice Blue #107AB0 ΔE 0.064
Use #187FD9 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.