#289EFC
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.2% 0.17 248.4), rgb(40, 158, 252).
Aa
Black text reads best on this color (7.38:1).
About this color
#289EFC is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.170 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.030 away. Black text reads best on it, at 7.38:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.38:1 |
| White text | 2.84:1 |
Values
| HEX | #289EFC |
| RGB | rgb(40, 158, 252) |
| HSL | hsl(207, 97%, 57%) |
| OKLCH | oklch(68.2% 0.17 248.4) |
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 #289EFC | 2.84:1 | Fails | Lc -59.2 | Large or bold text, headings |
| Black text on #289EFC | 7.38:1 | AAA | Lc 50.1 | Large or bold text, headings |
| #289EFC text on white | 2.84:1 | Fails | Lc 54.0 | Large or bold text, headings |
| #289EFC text on black | 7.38:1 | AAA | Lc -47.9 | 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
#BBDDFF
oklch(88.4% 0.059 248.5)
-
Step 300
300
#8CC6FF
oklch(80.8% 0.101 248.7)
-
Step 400
400 (this color)
#289EFC
oklch(68.2% 0.17 248.4)
-
Step 500
500
#008EEB
oklch(63.2% 0.171 248.3)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#004475
oklch(37.8% 0.103 248.3)
-
Step 950
950
#002848
oklch(27% 0.073 248.1)
#289EFC 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) | #71A3FF | 0.058 |
| Deuteranopia (no green cones) | #5091FA | 0.038 |
| Tritanopia (no blue cones) | #00B5C1 | 0.123 |
| Achromatopsia (no color) | #999999 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #289EFC
#289EFC
oklch(68.2% 0.17 248.4)
- #D48500
#D48500
oklch(68.3% 0.149 68.6)
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 #289EFC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.030
- Dodger Blue #1E90FF ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.066
- Deep Sky Blue #00BFFF ΔE 0.088
- Water Blue #0E87CC ΔE 0.090
- Periwinkle Blue #8F99FB ΔE 0.090
Use #289EFC 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.