#279DDD
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.3% 0.137 238.8), rgb(39, 157, 221).
Aa
Black text reads best on this color (6.95:1).
About this color
#279DDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.137 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.043 away. Black text reads best on it, at 6.95:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.95:1 |
| White text | 3.02:1 |
Values
| HEX | #279DDD |
| RGB | rgb(39, 157, 221) |
| HSL | hsl(201, 73%, 51%) |
| OKLCH | oklch(66.3% 0.137 238.8) |
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 #279DDD | 3.02:1 | AA large text | Lc -61.8 | Content text, not long reading |
| Black text on #279DDD | 6.95:1 | AA | Lc 47.6 | Large or bold text, headings |
| #279DDD text on white | 3.02:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #279DDD text on black | 6.95:1 | AA | Lc -45.3 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDEF
oklch(88.5% 0.036 239.2)
-
Step 300
300
#99C7E8
oklch(80.9% 0.067 239.8)
-
Step 400
400
#5BAADC
oklch(70.8% 0.107 238.6)
-
Step 500
500 (this color)
#279DDD
oklch(66.3% 0.137 238.8)
-
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
#042A3F
oklch(27.1% 0.056 238.5)
#279DDD 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) | #7E9DE0 | 0.073 |
| Deuteranopia (no green cones) | #668DDC | 0.059 |
| Tritanopia (no blue cones) | #00ADB3 | 0.089 |
| Achromatopsia (no color) | #949494 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #279DDD
#279DDD
oklch(66.3% 0.137 238.8)
- #D07B2E
#D07B2E
oklch(66.3% 0.137 58.4)
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 #279DDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.046
- Cornflower Blue #6495ED ΔE 0.056
- Water Blue #0E87CC ΔE 0.065
- Dodger Blue #1E90FF ΔE 0.068
- Faded Blue #658CBB ΔE 0.068
- Soft Blue #6488EA ΔE 0.074
- Turquoise Blue #06B1C4 ΔE 0.077
Use #279DDD 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.