#289BCE
Closest named color: Dark Sky Blue (#448EE4). oklch(65.1% 0.123 233.2), rgb(40, 155, 206).
Aa
Black text reads best on this color (6.67:1).
About this color
#289BCE is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.123 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.056 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #289BCE |
| RGB | rgb(40, 155, 206) |
| HSL | hsl(198, 67%, 48%) |
| OKLCH | oklch(65.1% 0.123 233.2) |
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 #289BCE | 3.14:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #289BCE | 6.67:1 | AA | Lc 45.9 | Large or bold text, headings |
| #289BCE text on white | 3.14:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #289BCE text on black | 6.67:1 | AA | Lc -43.6 | 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
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C4DDEC
oklch(88.4% 0.034 234.1)
-
Step 300
300
#9AC8E2
oklch(80.9% 0.061 233.3)
-
Step 400
400
#5EABD3
oklch(70.7% 0.096 233)
-
Step 500
500 (this color)
#289BCE
oklch(65.1% 0.123 233.2)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#052A3B
oklch(26.9% 0.051 233.3)
#289BCE 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) | #829AD0 | 0.079 |
| Deuteranopia (no green cones) | #6C8ACD | 0.066 |
| Tritanopia (no blue cones) | #00A9AC | 0.076 |
| Achromatopsia (no color) | #919191 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #289BCE
#289BCE
oklch(65.1% 0.123 233.2)
- #C97841
#C97841
oklch(65% 0.123 52.9)
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 #289BCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.056
- Faded Blue #658CBB ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.060
- Blue NCS #118AB2 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.069
- Dusty Blue #5A86AD ΔE 0.069
Use #289BCE 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.