#4375B2
Closest named color: Flat Blue (#3C73A8). oklch(55.6% 0.11 254.4), rgb(67, 117, 178).
Aa
White text reads best on this color (4.74:1).
About this color
#4375B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.110 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #4375B2 |
| RGB | rgb(67, 117, 178) |
| HSL | hsl(213, 45%, 48%) |
| OKLCH | oklch(55.6% 0.11 254.4) |
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 #4375B2 | 4.74:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #4375B2 | 4.42:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #4375B2 text on white | 4.74:1 | AA | Lc 72.7 | Content text, not long reading |
| #4375B2 text on black | 4.42:1 | AA large text | Lc -28.9 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EBF4
oklch(93.7% 0.014 254.6)
-
Step 200
200
#CDDBEB
oklch(88.6% 0.027 251.7)
-
Step 300
300
#ABC3E1
oklch(80.9% 0.05 254.1)
-
Step 400
400
#7FA3D1
oklch(70.6% 0.079 254.8)
-
Step 500
500
#5E8CC6
oklch(63.2% 0.101 254.8)
-
Step 600
600 (this color)
#4375B2
oklch(55.6% 0.11 254.4)
-
Step 700
700
#356299
oklch(49.1% 0.102 254.5)
-
Step 800
800
#2C507C
oklch(42.6% 0.085 254.4)
-
Step 900
900
#284364
oklch(37.8% 0.066 254.2)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#4375B2 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) | #5B79B5 | 0.031 |
| Deuteranopia (no green cones) | #4C6EB1 | 0.020 |
| Tritanopia (no blue cones) | #00838B | 0.091 |
| Achromatopsia (no color) | #737373 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4375B2
#4375B2
oklch(55.6% 0.11 254.4)
- #996816
#996816
oklch(55.6% 0.11 74.1)
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 #4375B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- Windows Blue #3778BF ΔE 0.021
- French Blue #436BAD ΔE 0.028
- Muted Blue #3B719F ΔE 0.032
- Nice Blue #107AB0 ΔE 0.033
- Dull Blue #49759C ΔE 0.035
- Steel Blue #4682B4 ΔE 0.038
- Cerulean #457B9D ΔE 0.042
Use #4375B2 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.