#279BDA
Closest named color: Dark Sky Blue (#448EE4). oklch(65.7% 0.135 238.7), rgb(39, 155, 218).
Aa
Black text reads best on this color (6.78:1).
About this color
#279BDA is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.135 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.043 away. Black text reads best on it, at 6.78:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.78:1 |
| White text | 3.09:1 |
Values
| HEX | #279BDA |
| RGB | rgb(39, 155, 218) |
| HSL | hsl(201, 71%, 50%) |
| OKLCH | oklch(65.7% 0.135 238.7) |
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 #279BDA | 3.09:1 | AA large text | Lc -62.8 | Content text, not long reading |
| Black text on #279BDA | 6.78:1 | AA | Lc 46.6 | Large or bold text, headings |
| #279BDA text on white | 3.09:1 | AA large text | Lc 57.4 | Large or bold text, headings |
| #279BDA text on black | 6.78:1 | AA | Lc -44.3 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEF
oklch(88.5% 0.036 239.2)
-
Step 300
300
#99C7E7
oklch(80.8% 0.066 239)
-
Step 400
400
#5CAADB
oklch(70.8% 0.105 238.3)
-
Step 500
500 (this color)
#279BDA
oklch(65.7% 0.135 238.7)
-
Step 600
600
#007CB4
oklch(55.7% 0.125 238.6)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#004769
oklch(37.8% 0.084 238.3)
-
Step 950
950
#042A3E
oklch(27.1% 0.055 237.2)
#279BDA 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) | #7D9BDD | 0.073 |
| Deuteranopia (no green cones) | #658BD9 | 0.058 |
| Tritanopia (no blue cones) | #00ABB1 | 0.088 |
| Achromatopsia (no color) | #929292 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #279BDA
#279BDA
oklch(65.7% 0.135 238.7)
- #CD7A2E
#CD7A2E
oklch(65.7% 0.135 58.8)
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 #279BDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
- Faded Blue #658CBB ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.068
- Cool Blue #4984B8 ΔE 0.072
- Blue NCS #118AB2 ΔE 0.072
Use #279BDA 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.