#289EDB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.4% 0.134 237.4), rgb(40, 158, 219).
Aa
Black text reads best on this color (7.00:1).
About this color
#289EDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.134 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.046 away. Black text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #289EDB |
| RGB | rgb(40, 158, 219) |
| HSL | hsl(200, 71%, 51%) |
| OKLCH | oklch(66.4% 0.134 237.4) |
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 #289EDB | 2.99:1 | Fails | Lc -61.5 | Content text, not long reading |
| Black text on #289EDB | 7.00:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #289EDB text on white | 2.99:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #289EDB text on black | 7.00:1 | AAA | Lc -45.6 | 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
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEF
oklch(88.5% 0.036 239.2)
-
Step 300
300
#99C8E6
oklch(81% 0.065 236.6)
-
Step 400
400
#5BAADA
oklch(70.7% 0.105 237.4)
-
Step 500
500 (this color)
#289EDB
oklch(66.4% 0.134 237.4)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#042A3E
oklch(27.1% 0.055 237.2)
#289EDB 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) | #819EDE | 0.076 |
| Deuteranopia (no green cones) | #698EDA | 0.060 |
| Tritanopia (no blue cones) | #00AEB3 | 0.087 |
| Achromatopsia (no color) | #959595 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #289EDB
#289EDB
oklch(66.4% 0.134 237.4)
- #D07C35
#D07C35
oklch(66.5% 0.134 57.3)
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 #289EDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.058
- Water Blue #0E87CC ΔE 0.067
- Faded Blue #658CBB ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.072
- Dodger Blue #1E90FF ΔE 0.072
- Soft Blue #6488EA ΔE 0.077
Use #289EDB 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.