#128DBB
Closest named color: Blue NCS (#118AB2). oklch(60.4% 0.118 231.1), rgb(18, 141, 187).
Aa
Black text reads best on this color (5.55:1).
About this color
#128DBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.118 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.015 away. Black text reads best on it, at 5.55:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.55:1 |
| White text | 3.78:1 |
Values
| HEX | #128DBB |
| RGB | rgb(18, 141, 187) |
| HSL | hsl(196, 82%, 40%) |
| OKLCH | oklch(60.4% 0.118 231.1) |
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 #128DBB | 3.78:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #128DBB | 5.55:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #128DBB text on white | 3.78:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #128DBB 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF3
oklch(93.5% 0.017 230.9)
-
Step 200
200
#C5DEEB
oklch(88.6% 0.032 230.3)
-
Step 300
300
#9BC8E0
oklch(80.9% 0.058 231.7)
-
Step 400
400
#5FABD0
oklch(70.7% 0.093 231.2)
-
Step 500
500 (this color)
#128DBB
oklch(60.4% 0.118 231.1)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#062A3A
oklch(26.9% 0.049 232.2)
#128DBB 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) | #758BBD | 0.078 |
| Deuteranopia (no green cones) | #607DBA | 0.065 |
| Tritanopia (no blue cones) | #00999D | 0.067 |
| Achromatopsia (no color) | #838383 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128DBB
#128DBB
oklch(60.4% 0.118 231.1)
- #B86B39
#B86B39
oklch(60.4% 0.118 51.7)
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 #128DBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.015
- Water Blue #0E87CC ΔE 0.035
- Cool Blue #4984B8 ΔE 0.036
- Steel Blue #4682B4 ΔE 0.037
- Teal Blue #01889F ΔE 0.044
- Off Blue #5684AE ΔE 0.046
- Dusty Blue #5A86AD ΔE 0.048
- Nice Blue #107AB0 ΔE 0.055
Use #128DBB 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.