#139BF4
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.8% 0.167 246), rgb(19, 155, 244).
Aa
Black text reads best on this color (7.02:1).
About this color
#139BF4 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.167 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.026 away. Black text reads best on it, at 7.02:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.02:1 |
| White text | 2.99:1 |
Values
| HEX | #139BF4 |
| RGB | rgb(19, 155, 244) |
| HSL | hsl(204, 91%, 52%) |
| OKLCH | oklch(66.8% 0.167 246) |
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 #139BF4 | 2.99:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #139BF4 | 7.02:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #139BF4 text on white | 2.99:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #139BF4 text on black | 7.02:1 | AAA | Lc -45.9 | Large or bold text, headings |
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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C1DDF6
oklch(88.5% 0.046 245.3)
-
Step 300
300
#95C6F3
oklch(80.8% 0.082 246.7)
-
Step 400
400
#53A7ED
oklch(70.6% 0.131 246.3)
-
Step 500
500 (this color)
#139BF4
oklch(66.8% 0.167 246)
-
Step 600
600
#0078C1
oklch(55.5% 0.143 246.2)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005387
oklch(42.8% 0.11 245.8)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#139BF4 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) | #709FF8 | 0.065 |
| Deuteranopia (no green cones) | #4F8DF2 | 0.043 |
| Tritanopia (no blue cones) | #00B1BC | 0.118 |
| Achromatopsia (no color) | #959595 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #139BF4
#139BF4
oklch(66.8% 0.167 246)
- #D17F00
#D17F00
oklch(66.9% 0.149 66.1)
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 #139BF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.049
- Soft Blue #6488EA ΔE 0.064
- Water Blue #0E87CC ΔE 0.075
- Clear Blue #247AFD ΔE 0.088
- Faded Blue #658CBB ΔE 0.093
Use #139BF4 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.