#409AE9
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.9% 0.145 248.4), rgb(64, 154, 233).
Aa
Black text reads best on this color (7.01:1).
About this color
#409AE9 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.145 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.018 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #409AE9 |
| RGB | rgb(64, 154, 233) |
| HSL | hsl(208, 79%, 58%) |
| OKLCH | oklch(66.9% 0.145 248.4) |
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 #409AE9 | 2.99:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #409AE9 | 7.01:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #409AE9 text on white | 2.99:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #409AE9 text on black | 7.01:1 | AAA | Lc -45.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9DC5ED
oklch(80.9% 0.071 248.7)
-
Step 400
400
#64A6E4
oklch(70.7% 0.114 248.3)
-
Step 500
500 (this color)
#409AE9
oklch(66.9% 0.145 248.4)
-
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
#0B4471
oklch(37.7% 0.095 248.3)
-
Step 950
950
#0A2842
oklch(27% 0.06 248.4)
#409AE9 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) | #769EEC | 0.053 |
| Deuteranopia (no green cones) | #5E8EE7 | 0.037 |
| Tritanopia (no blue cones) | #00ADB7 | 0.107 |
| Achromatopsia (no color) | #959595 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #409AE9
#409AE9
oklch(66.9% 0.145 248.4)
- #CE8106
#CE8106
oklch(66.9% 0.145 68.2)
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 #409AE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.018
- Dark Sky Blue #448EE4 ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.050
- Soft Blue #6488EA ΔE 0.053
- Water Blue #0E87CC ΔE 0.072
- Faded Blue #658CBB ΔE 0.073
- Cool Blue #4984B8 ΔE 0.085
Use #409AE9 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.