#128EB4
Closest named color: Blue NCS (#118AB2). oklch(60.3% 0.112 226), rgb(18, 142, 180).
Aa
Black text reads best on this color (5.55:1).
About this color
#128EB4 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.112 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.012 away. Black text reads best on it, at 5.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.55:1 |
| White text | 3.78:1 |
Values
| HEX | #128EB4 |
| RGB | rgb(18, 142, 180) |
| HSL | hsl(194, 82%, 39%) |
| OKLCH | oklch(60.3% 0.112 226) |
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 #128EB4 | 3.78:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #128EB4 | 5.55:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #128EB4 text on white | 3.78:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #128EB4 text on black | 5.55:1 | AA | Lc -36.8 | 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 500.
-
Step 50
50
#F1F7F9
oklch(97.2% 0.007 219.6)
-
Step 100
100
#DFECF2
oklch(93.5% 0.016 227)
-
Step 200
200
#C5DEE9
oklch(88.6% 0.031 226.1)
-
Step 300
300
#9BC9DC
oklch(81% 0.055 225.2)
-
Step 400
400
#60ACCA
oklch(70.7% 0.087 225.8)
-
Step 500
500 (this color)
#128EB4
oklch(60.3% 0.112 226)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#062B38
oklch(27.1% 0.047 226.3)
#128EB4 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) | #798BB6 | 0.083 |
| Deuteranopia (no green cones) | #657DB4 | 0.072 |
| Tritanopia (no blue cones) | #00999B | 0.058 |
| Achromatopsia (no color) | #838383 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128EB4
#128EB4
oklch(60.3% 0.112 226)
- #B76A44
#B76A44
oklch(60.3% 0.112 46.2)
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 #128EB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.012
- Teal Blue #01889F ΔE 0.035
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.041
- Off Blue #5684AE ΔE 0.046
- Water Blue #0E87CC ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.048
- Teal Green #0A9396 ΔE 0.054
Use #128EB4 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.