#188FDC
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.15 244.8), rgb(24, 143, 220).
Aa
Black text reads best on this color (6.00:1).
About this color
#188FDC is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.150 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.027 away. Black text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.00:1 |
| White text | 3.49:1 |
Values
| HEX | #188FDC |
| RGB | rgb(24, 143, 220) |
| HSL | hsl(204, 80%, 48%) |
| OKLCH | oklch(62.7% 0.15 244.8) |
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 #188FDC | 3.49:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #188FDC | 6.00:1 | AA | Lc 42.1 | Non-text elements, placeholder text |
| #188FDC text on white | 3.49:1 | AA large text | Lc 62.0 | Content text, not long reading |
| #188FDC text on black | 6.00:1 | AA | Lc -39.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#99C6ED
oklch(80.8% 0.073 245)
-
Step 400
400
#5BA8E5
oklch(70.8% 0.118 244.5)
-
Step 500
500 (this color)
#188FDC
oklch(62.7% 0.15 244.8)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0065A1
oklch(49% 0.124 245.1)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#052942
oklch(27.1% 0.061 244.2)
#188FDC 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) | #6A92DF | 0.062 |
| Deuteranopia (no green cones) | #4E81DB | 0.045 |
| Tritanopia (no blue cones) | #00A2AB | 0.105 |
| Achromatopsia (no color) | #898989 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #188FDC
#188FDC
oklch(62.7% 0.15 244.8)
- #C17300
#C17300
oklch(62.7% 0.141 64.9)
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 #188FDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.027
- Water Blue #0E87CC ΔE 0.031
- Chefchaouen Blue #4895EF ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.053
- Cool Blue #4984B8 ΔE 0.059
- Soft Blue #6488EA ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.064
- Blue NCS #118AB2 ΔE 0.064
Use #188FDC 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.