#409FC9
Closest named color: Turquoise Blue (#06B1C4). oklch(66.4% 0.108 230.7), rgb(64, 159, 201).
Aa
Black text reads best on this color (7.02:1).
About this color
#409FC9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.108 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.055 away. Black text reads best on it, at 7.02:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.02:1 |
| White text | 2.99:1 |
Values
| HEX | #409FC9 |
| RGB | rgb(64, 159, 201) |
| HSL | hsl(198, 56%, 52%) |
| OKLCH | oklch(66.4% 0.108 230.7) |
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 #409FC9 | 2.99:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #409FC9 | 7.02:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #409FC9 text on white | 2.99:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #409FC9 text on black | 7.02:1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#9FC8DD
oklch(81% 0.053 230.4)
-
Step 400
400
#66AACC
oklch(70.6% 0.085 231.4)
-
Step 500
500 (this color)
#409FC9
oklch(66.4% 0.108 230.7)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#0B4860
oklch(37.8% 0.07 230.6)
-
Step 950
950
#0B2A38
oklch(27% 0.044 231.3)
#409FC9 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) | #8A9DCB | 0.074 |
| Deuteranopia (no green cones) | #778FC8 | 0.064 |
| Tritanopia (no blue cones) | #00ABAD | 0.066 |
| Achromatopsia (no color) | #959595 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #409FC9
#409FC9
oklch(66.4% 0.108 230.7)
- #C87F54
#C87F54
oklch(66.4% 0.108 50.5)
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 #409FC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.055
- Faded Blue #658CBB ΔE 0.056
- Greyblue #77A1B5 ΔE 0.058
- Cadet Blue #5F9EA0 ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.070
- Chefchaouen Blue #4895EF ΔE 0.070
- Silver Lake Blue #778DA9 ΔE 0.071
- Dusty Blue #5A86AD ΔE 0.072
Use #409FC9 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.