#4375AA
Closest named color: Flat Blue (#3C73A8). oklch(55.1% 0.099 251.3), rgb(67, 117, 170).
Aa
White text reads best on this color (4.81:1).
About this color
#4375AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.099 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.010 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #4375AA |
| RGB | rgb(67, 117, 170) |
| HSL | hsl(211, 43%, 46%) |
| OKLCH | oklch(55.1% 0.099 251.3) |
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 #4375AA | 4.81:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #4375AA | 4.36:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #4375AA text on white | 4.81:1 | AA | Lc 73.2 | Content text, not long reading |
| #4375AA text on black | 4.36:1 | AA large text | Lc -28.5 | Dividers and decoration only |
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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE9
oklch(88.6% 0.024 250.1)
-
Step 300
300
#ACC3DD
oklch(80.8% 0.045 251.6)
-
Step 400
400
#80A4CC
oklch(70.7% 0.071 251.5)
-
Step 500
500
#5F8DBF
oklch(63.1% 0.091 251.4)
-
Step 600
600 (this color)
#4375AA
oklch(55.1% 0.099 251.3)
-
Step 700
700
#366393
oklch(49% 0.092 251.6)
-
Step 800
800
#2D5177
oklch(42.6% 0.076 251.2)
-
Step 900
900
#294360
oklch(37.6% 0.059 252.1)
-
Step 950
950
#182838
oklch(27.1% 0.037 249.3)
#4375AA 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) | #5F78AC | 0.034 |
| Deuteranopia (no green cones) | #516DA9 | 0.025 |
| Tritanopia (no blue cones) | #008188 | 0.081 |
| Achromatopsia (no color) | #727272 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4375AA
#4375AA
oklch(55.1% 0.099 251.3)
- #966727
#966727
oklch(55.1% 0.099 71.1)
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 #4375AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.010
- Muted Blue #3B719F ΔE 0.022
- Dull Blue #49759C ΔE 0.023
- French Blue #436BAD ΔE 0.030
- Cerulean #457B9D ΔE 0.031
- Nice Blue #107AB0 ΔE 0.031
- Windows Blue #3778BF ΔE 0.033
- Stormy Blue #507B9C ΔE 0.035
Use #4375AA 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.