#4370AB
Closest named color: Flat Blue (#3C73A8). oklch(54% 0.106 255.8), rgb(67, 112, 171).
Aa
White text reads best on this color (5.06:1).
About this color
#4370AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.106 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.012 away. White text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.14:1 |
| White text | 5.06:1 |
Values
| HEX | #4370AB |
| RGB | rgb(67, 112, 171) |
| HSL | hsl(214, 44%, 47%) |
| OKLCH | oklch(54% 0.106 255.8) |
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 #4370AB | 5.06:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #4370AB | 4.14:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #4370AB text on white | 5.06:1 | AA | Lc 74.8 | Content text, not long reading |
| #4370AB text on black | 4.14:1 | AA large text | Lc -26.9 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ADC3E0
oklch(81% 0.048 255.4)
-
Step 400
400
#81A3D0
oklch(70.7% 0.076 255.6)
-
Step 500
500
#618CC4
oklch(63.2% 0.097 255.4)
-
Step 600
600 (this color)
#4370AB
oklch(54% 0.106 255.8)
-
Step 700
700
#396297
oklch(49.1% 0.097 255.5)
-
Step 800
800
#2F507B
oklch(42.7% 0.082 255.6)
-
Step 900
900
#2A4363
oklch(37.8% 0.063 255.1)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#4370AB 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) | #5774AD | 0.027 |
| Deuteranopia (no green cones) | #496AAA | 0.017 |
| Tritanopia (no blue cones) | #007D85 | 0.089 |
| Achromatopsia (no color) | #6E6E6E | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4370AB
#4370AB
oklch(54% 0.106 255.8)
- #926516
#926516
oklch(54.1% 0.106 75.6)
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 #4370AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.012
- French Blue #436BAD ΔE 0.015
- Muted Blue #3B719F ΔE 0.022
- Dull Blue #49759C ΔE 0.032
- Windows Blue #3778BF ΔE 0.034
- Mid Blue #276AB3 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.038
- Cerulean #457B9D ΔE 0.044
Use #4370AB 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.