#138DC6
Closest named color: Water Blue (#0E87CC). oklch(61% 0.129 236.9), rgb(19, 141, 198).
Aa
Black text reads best on this color (5.65:1).
About this color
#138DC6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.129 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.65:1 |
| White text | 3.71:1 |
Values
| HEX | #138DC6 |
| RGB | rgb(19, 141, 198) |
| HSL | hsl(199, 82%, 43%) |
| OKLCH | oklch(61% 0.129 236.9) |
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 #138DC6 | 3.71:1 | AA large text | Lc -69.7 | Content text, not long reading |
| Black text on #138DC6 | 5.65:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #138DC6 text on white | 3.71:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #138DC6 text on black | 5.65:1 | AA | Lc -37.5 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEE
oklch(88.4% 0.036 237.6)
-
Step 300
300
#9AC7E5
oklch(80.8% 0.064 237.8)
-
Step 400
400
#5EAAD7
oklch(70.7% 0.1 236.5)
-
Step 500
500 (this color)
#138DC6
oklch(61% 0.129 236.9)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#062A3D
oklch(27.1% 0.053 236.9)
#138DC6 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) | #718DC9 | 0.072 |
| Deuteranopia (no green cones) | #5A7EC5 | 0.058 |
| Tritanopia (no blue cones) | #009CA1 | 0.082 |
| Achromatopsia (no color) | #858585 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #138DC6
#138DC6
oklch(61% 0.129 236.9)
- #BC6C28
#BC6C28
oklch(61% 0.129 56.6)
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 #138DC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Blue NCS #118AB2 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.041
- Off Blue #5684AE ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.055
- Windows Blue #3778BF ΔE 0.057
Use #138DC6 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.