#139EFB
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.9% 0.173 246.6), rgb(19, 158, 251).
Aa
Black text reads best on this color (7.31:1).
About this color
#139EFB is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.173 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.032 away. Black text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.31:1 |
| White text | 2.87:1 |
Values
| HEX | #139EFB |
| RGB | rgb(19, 158, 251) |
| HSL | hsl(204, 97%, 53%) |
| OKLCH | oklch(67.9% 0.173 246.6) |
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 #139EFB | 2.87:1 | Fails | Lc -59.6 | Large or bold text, headings |
| Black text on #139EFB | 7.31:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #139EFB text on white | 2.87:1 | Fails | Lc 54.3 | Large or bold text, headings |
| #139EFB text on black | 7.31:1 | AAA | Lc -47.5 | 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 400.
-
Step 50
50
#EEF7FF
oklch(97.2% 0.014 244.7)
-
Step 100
100
#DAECFE
oklch(93.5% 0.031 248.2)
-
Step 200
200
#BADEFF
oklch(88.6% 0.059 246.2)
-
Step 300
300
#89C7FF
oklch(80.9% 0.102 246.7)
-
Step 400
400 (this color)
#139EFB
oklch(67.9% 0.173 246.6)
-
Step 500
500
#008FE6
oklch(63.1% 0.164 246.6)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#139EFB 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) | #70A3FF | 0.064 |
| Deuteranopia (no green cones) | #4E90F9 | 0.042 |
| Tritanopia (no blue cones) | #00B5C0 | 0.123 |
| Achromatopsia (no color) | #989898 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #139EFB
#139EFB
oklch(67.9% 0.173 246.6)
- #D58200
#D58200
oklch(67.9% 0.151 66.4)
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 #139EFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.032
- Dodger Blue #1E90FF ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.051
- Soft Blue #6488EA ΔE 0.069
- Water Blue #0E87CC ΔE 0.087
- Deep Sky Blue #00BFFF ΔE 0.089
- Clear Blue #247AFD ΔE 0.093
Use #139EFB 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.