#128CB8
Closest named color: Blue NCS (#118AB2). oklch(60% 0.116 230.1), rgb(18, 140, 184).
Aa
Black text reads best on this color (5.46:1).
About this color
#128CB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.116 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.010 away. Black text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.46:1 |
| White text | 3.83:1 |
Values
| HEX | #128CB8 |
| RGB | rgb(18, 140, 184) |
| HSL | hsl(196, 82%, 40%) |
| OKLCH | oklch(60% 0.116 230.1) |
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 #128CB8 | 3.83:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #128CB8 | 5.46:1 | AA | Lc 38.7 | Non-text elements, placeholder text |
| #128CB8 text on white | 3.83:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #128CB8 text on black | 5.46:1 | AA | Lc -36.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C5DEEA
oklch(88.6% 0.031 228.2)
-
Step 300
300
#9BC8DF
oklch(80.9% 0.057 230.5)
-
Step 400
400
#60ABCE
oklch(70.6% 0.09 230)
-
Step 500
500 (this color)
#128CB8
oklch(60% 0.116 230.1)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8D
oklch(49.1% 0.098 229.8)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#062A39
oklch(26.8% 0.048 230.5)
#128CB8 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) | #758ABA | 0.079 |
| Deuteranopia (no green cones) | #617CB7 | 0.067 |
| Tritanopia (no blue cones) | #00989B | 0.066 |
| Achromatopsia (no color) | #828282 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128CB8
#128CB8
oklch(60% 0.116 230.1)
- #B76A3B
#B76A3B
oklch(60.1% 0.116 50.4)
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 #128CB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.010
- Cool Blue #4984B8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.036
- Water Blue #0E87CC ΔE 0.037
- Teal Blue #01889F ΔE 0.039
- Off Blue #5684AE ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.047
- Nice Blue #107AB0 ΔE 0.052
Use #128CB8 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.