#139EB8
Closest named color: Turquoise Blue (#06B1C4). oklch(64.5% 0.111 215.4), rgb(19, 158, 184).
Aa
Black text reads best on this color (6.61:1).
About this color
#139EB8 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.111 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.054 away. Black text reads best on it, at 6.61:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 6.61:1 |
| White text | 3.17:1 |
Values
| HEX | #139EB8 |
| RGB | rgb(19, 158, 184) |
| HSL | hsl(189, 81%, 40%) |
| OKLCH | oklch(64.5% 0.111 215.4) |
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 #139EB8 | 3.17:1 | AA large text | Lc -63.8 | Content text, not long reading |
| Black text on #139EB8 | 6.61:1 | AA | Lc 45.7 | Large or bold text, headings |
| #139EB8 text on white | 3.17:1 | AA large text | Lc 58.4 | Large or bold text, headings |
| #139EB8 text on black | 6.61:1 | AA | Lc -43.4 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDF0
oklch(93.7% 0.015 212)
-
Step 200
200
#C4DFE6
oklch(88.6% 0.03 215.1)
-
Step 300
300
#99CAD7
oklch(80.9% 0.054 215.9)
-
Step 400
400
#5AAEC3
oklch(70.6% 0.087 216.2)
-
Step 500
500 (this color)
#139EB8
oklch(64.5% 0.111 215.4)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#022C34
oklch(27% 0.046 213.8)
#139EB8 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) | #8C99B9 | 0.098 |
| Deuteranopia (no green cones) | #788AB8 | 0.089 |
| Tritanopia (no blue cones) | #00A7A6 | 0.044 |
| Achromatopsia (no color) | #909090 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #139EB8
#139EB8
oklch(64.5% 0.111 215.4)
- #C7745E
#C7745E
oklch(64.5% 0.11 35.7)
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 #139EB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.054
- Cadet Blue #5F9EA0 ΔE 0.054
- Teal Green #0A9396 ΔE 0.055
- Sea #3C9992 ΔE 0.055
- Blue NCS #118AB2 ΔE 0.058
- Persian Green #2A9D8F ΔE 0.062
- Blue Green #0F9B8E ΔE 0.063
- Teal Blue #01889F ΔE 0.069
Use #139EB8 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.