#128DA8
Closest named color: Teal Blue (#01889F). oklch(59.5% 0.104 218.3), rgb(18, 141, 168).
Aa
Black text reads best on this color (5.40:1).
About this color
#128DA8 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.104 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.019 away. Black text reads best on it, at 5.40:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #128DA8 |
| RGB | rgb(18, 141, 168) |
| HSL | hsl(191, 81%, 36%) |
| OKLCH | oklch(59.5% 0.104 218.3) |
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 #128DA8 | 3.88:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #128DA8 | 5.40:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #128DA8 text on white | 3.88:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #128DA8 text on black | 5.40:1 | AA | Lc -35.8 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0ECF0
oklch(93.5% 0.014 219.6)
-
Step 200
200
#C5DEE6
oklch(88.5% 0.029 219)
-
Step 300
300
#9CC9D7
oklch(80.9% 0.051 218.8)
-
Step 400
400
#61ADC3
oklch(70.7% 0.082 218.7)
-
Step 500
500 (this color)
#128DA8
oklch(59.5% 0.104 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#072B34
oklch(26.9% 0.043 218.2)
#128DA8 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) | #7C89A9 | 0.088 |
| Deuteranopia (no green cones) | #697BA8 | 0.079 |
| Tritanopia (no blue cones) | #009696 | 0.045 |
| Achromatopsia (no color) | #818181 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128DA8
#128DA8
oklch(59.5% 0.104 218.3)
- #B36850
#B36850
oklch(59.6% 0.103 38.5)
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 #128DA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.019
- Blue NCS #118AB2 ΔE 0.020
- Teal Green #0A9396 ΔE 0.038
- Dark Cyan #008B8B ΔE 0.046
- Steel Blue #4682B4 ΔE 0.049
- Cool Blue #4984B8 ΔE 0.051
- Off Blue #5684AE ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.052
Use #128DA8 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.